the wikipedia on hazards of cellphone radiation and bioelectromagnetic fields
Tuesday, April 10, 2007
More on the cellphone hazard--truth and fiction
Category: Life
I have written over 100 posts on bioelectromagnetic fields, health issues, and the mobil phone controversy. www.yahoogroups.com/tech/bioelectromagnetics
has hundreds of posts on the subject, as well as the "Bioelectromagnetics Journal" published by the Bioelectromagnetics Society in the USA. The following article collectioin is from the online open library "Wikipedia" which I also participate in.
Scott Hill
frontier sciences group
Copenhagen
http://www.myspace.com/frontiersciences
http://frontiersciences.spaces.live.com
Mobile phone radiation and health
From Wikipedia, the free encyclopedia
Jump to: navigation, search
.. start content -->
A Greenfield-type tower used in base stations for mobile telephony
A modern mobile phone (Samsung)
Mobile phone radiation and health concerns have been raised, especially following the enormous increase in the use of wireless mobile telephony throughout the world (as of August 2005, there were more than 2 billion users worldwide). This is because mobile phones use electromagnetic waves in the microwave range. These concerns have induced a large body of research (both epidemiological and experimental, in non-human animals as well as in humans). Concerns about effects on health have also been raised regarding other digital wireless systems, such as data communication networks.
The World Health Organization has officially ruled out adverse health effects from cellular base stations and wireless data networks, and expects to make recommendations about mobile phones in 2007-08 [3][4].
However, some National Radiation Protection Authorities, i.e. Austria[1] Germany[2] and Sweden,[3] recommends their citizens to minimize radiation. Examples of recommendations are:
Use hands-free to decrease the radiation to the head
Keep the mobile phone away from the body.
Do not telephone in a car without an external antenna.
..> Contents
[hide]
1 Health hazards of handsets
1.1 Thermal effects
1.2 Non-thermal effects
1.3 Genotoxical effects
1.4 Mobile phones and cancer
1.5 Electromagnetic hypersensitivity syndrome
2 Health hazards of base stations
3 Occupational health hazards
4 Safety standards and licensing
5 Lawsuits
6 Precautionary principle
7 See also
8 References
9 External links
9.1 Independent Organisations
9.2 Government
9.3 Industry
9.4 Web news aggegators
..>
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[edit] Health hazards of handsets
Calculated specific absorbed radiation (SAR) distribution in an anatomical model of head next to a 125 mW dipole antenna. Peak SAR is 9.5 W/kg over 1 mg, whole head average is 0.008 W/kg. (USAF/AFRL).
Part of the radio waves emitted by a mobile telephone handset are absorbed by the human head. The radio waves emitted by a GSM handset, can have a peak power of 2 watts, and a US analog phone had a maximum transmit power of 3.6 watts. Other digital mobile technologies, such as CDMA and TDMA, use lower output power, typically below 1 watt. The maximum power output from a mobile phone is regulated by the mobile phone standard it is following and by the regulatory agencies in each country. In most systems the cellphone and the base station check reception quality and signal strength and the power level is increased or decreased automatically, within a certain span, to accommodate for different situations such as inside or outside of buildings and vehicles.
The rate at which radiation is absorbed by the human body is measured by the Specific Absorption Rate (SAR), and its maximum levels for modern handsets have been set by governmental regulating agencies in many countries. In the USA, the FCC has set a SAR limit of 1.6 W/kg, averaged over a volume of 1 gram of tissue, for the head. In Europe, the limit is 2 W/kg, averaged over a volume of 10 grams of tissue. SAR values are heavily dependent on the size of the averaging volume. Without information about the averaging volume used comparisons between different measurements can not be made. Thus, the European 10-gram ratings should be compared among themselves, and the American 1-gram ratings should only be compared among themselves.
[edit] Thermal effects
Microscope photographs of lenses incubated in organ culture conditions for 12 days. Right frame shows Control lens with no damage. Bottom frame demonstrates the effect of microwave radiation on bovine lens sutures for a total exposure of 192 cycles (1.1 GHz, 2.22 mW). Each cycle lasts 50 min followed by 10 min pause. In the absence of microwave radiation, the bubbles are generated by temperature increase to 39.5 °C during 4 h; see left frame. Credit: IsraCast Technology News [2]
One well-understood effect of microwave radiation is dielectric heating, in which any dielectric material (such as living tissue) is heated by rotations of polar molecules induced by the electromagnetic field. In the case of a person using a cell phone, most of the heating effect may occur in the head surface, causing its temperature to increase by a fraction of a degree. The level of temperature increase is an order of magnitude less than that obtained during the exposure of the head to direct sunlight. The brain's blood circulation easily disposes of excess heat by instantaneously increasing local blood flow. However, the cornea of the eye does not have this temperature regulation mechanism. Premature cataracts are known as an occupational disease of engineers who work on high power radio transmitters at similar frequencies.[citation needed] Premature cataracts however, have not been linked with cell phone use, possibly because of the lower power output of mobile phones.
It has been claimed that some parts of the human head are more sensitive to damage due to increases in temperature, particularly in anatomical structures with poor vasculature, such as nerve fibers. More recent results from a Swedish scientific team at the Karolinska Institute (Lonn, Ahlbom, Hall and Feychting) have suggested that continuous use of a mobile phone for a decade or longer can lead to a small increase in the probability of getting acoustic neuroma, a type of brain tumor. The increase was not noted in those who used phones for less than 10 years.[4]
[edit] Non-thermal effects
The communications protocols used by mobile phones often result in low-frequency pulsing of the carrier signal. These low frequencies are similar to those that exist in the electrical oscillations of the human body, specifically the alpha and delta brain waves[citation needed]. No experimental results to date have indicated that this hypothesis is valid.[5]
Other researchers have argued that the so-called "non-thermal effects" could be reinterpreted as a normal cellular response to an increase in temperature. The noted German biophysicist Roland Glaser, for example in,[6] has argued that there are several thermoreceptor molecules in cells, and that they activate a cascade of second and third messenger systems, gene expression mechanisms and production of heat shock proteins in order to defend the cell against metabolic cell stress caused by heat. The increases in temperature that cause these changes are too small to be detected by studies such as REFLEX, which base their whole argument on the apparent stability of thermal equilibrium in their cell cultures.
[edit] Genotoxical effects
It has for a long time been known that Microwave radiation can cause break in DNA-strings[citation needed]. In December 2004 a pan-European study named REFLEX (Risk Evaluation of Potential Environmental Hazards from Low Energy Electromagnetic Field (EMF) Exposure Using Sensitive in vitro Methods), involving 12 collaborating laboratories in several countries showed some compelling evidence of DNA damage of cells in in-vitro cultures, when exposed between 0.3 to 2 watts/kg, whole-sample average. There were indications, but not rigorous evidence of other cell changes, including damage to chromosomes, alterations in the activity of certain genes and a boosted rate of cell division.[7]
[edit] Mobile phones and cancer
In 2006 a large Danish study about the connection between mobile phone use and cancer incidence was published. It followed over 420,000 danish citizens over 20 years and showed no increased risk of cancer.[8] Some scientists claim that the design of the study was flawed in favor of finding no links.[9]
In order to investigate the risk of cancer for the Mobile Phone user, a cooperative project between 13 countries has been launched called INTERPHONE. The idea is that cancers need time to develop so only studies over 10 years are of interest.[10]
Following studies of long time exposure have been published:
A Danish study (2004) had too few longtime users to be conclusive at 10 years.[11]
A Swedish study (2005) that draws the conclusion that "the data do not support the hypothesis that mobile phone use is related to an increased risk of glioma or meningioma."[12]
A British study (2005) that draws the conclusion that "The study suggests that there is no substantial risk of acoustic neuroma in the first decade after starting mobile phone use. However, an increase in risk after longer term use or after a longer lag period could not be ruled out."[13]
A German study (2006) that draws the conclusion that " In conclusion, no overall increased risk of glioma or meningioma was observed among these cellular phone users; however, for long-term cellular phone users, results need to be confirmed before firm conclusions can be drawn."[14].
A joint study that draws the conclusion that "Although our results overall do not indicate an increased risk of glioma in relation to mobile phone use, the possible risk in the most heavily exposed part of the brain with long-term use needs to be explored further before firm conclusions can be drawn."[15]
Other studies on cancer are:
Tumour risk associated with use of cellular telephones or cordless desktop telephones,that says: "We found for all studied phone types an increased risk for brain tumours, mainly acoustic neuroma and malignant brain tumours".[16]
A Swedish study (2004) concludes: "Our findings do not indicate an increased risk of acoustic neuroma related to short-term mobile phone use after a short latency period. However, our data suggest an increased risk of acoustic neuroma associated with mobile phone use of at least 10 years' duration.".[17]
[edit] Electromagnetic hypersensitivity syndrome
Many[citation needed] users of mobile handsets have reported feeling several unspecific symptoms during and after its use, such as burning and tingling sensations in the skin of the head and extremities, fatigue, sleep disturbances, dizziness, loss of mental attention, reaction times and memory retentiveness, headaches, malaise, tachycardia (heart palpitations) and disturbances of the digestive system. Some researchers, implying a causal relationship, have named this syndrome as a new diagnostic entity, EHS or ES (electrosensitivity). The World Health Organization prefers to name it "idiopathic environmental intolerance", in order to avoid the implication of causation.
[edit] Health hazards of base stations
Another area of worry about effects on the population's health have been the radiation emitted by base stations (the antennas on the surface which communicate with the phones), because, in contrast to mobile handsets, it is emitted continuously and is much more powerful. Due to the attenuation of power with the square of distance, field intensities drop rapidly with distance away from the base of the antenna. A 2002 survey study by Santini et al. found a variety of health effects for people who reported that they were living within 1,000 feet (325 meters) of cell towers in rural areas; or within 300 feet (100 meters) of base stations in urban areas. Fatigue, headache, sleep disruption and loss of memory were among the effects found.[18]
As technology progresses and data demands have increased on the mobile network, the number of towers has increased sharply in many cities, and competing companies usually do not make an effort towards sharing towers[citation needed]. The latest trend is 3G towers, which work with higher bandwidths. The buildup of networks has sparked many health concerns and much community outrage[citation needed]. Examples of such can be seen from headlines around the world; locals pulling down base station masts, or even, in some countries, physically attacking installation crews, communities lobbying against the rollout of cell networks, protest banners, demonstrations near hospitals, houses and local schools[citation needed].
Many measurements and experiments have shown that transmitter power levels are relatively low - in modern 2G antennas, in the range of 20 to 100 watts, with the 3G towers causing less radiation than the already present 2G network. An average radiation power output of 3 watt is used. 'Micro-cell geometries' inside cities have decreased the amount of irradiated power even further.[citation needed]
The radiation exposure from these antennas, while generally low level, is still continuous. Some scientists [19] believe that chronic, low-level radiation exposure may, over time, may be as harmful as higher-level, acute radiation exposures (as from cell phone use).
There are recent (Jan 2007) reliable, well conducted and long-range epidemiological studies published on health effects of radio and base stations in Schwizerland (Schwarzenburg),[20] France,[21] Spain[22] and,[23] Austria[24] and Egypt.[25] There is yet no study reporting no effect at all in WHO EMF database.[26]
[edit] Occupational health hazards
Telecommunication workers who spend time at a short distance from the active equipment, for the purposes of testing, maintenance, installation, etc. may be at risk of much greater exposure than the general population. Many times base stations are not turned off during maintenance, because that would affect the network, so people work near "live" antennas.
A variety of studies over the past 50 years have been done on workers exposed to high RF radiation levels: Studies including radar laboratory workers, military radar workers, electrical workers, amateur radio operators. Most of these studies found no increase in cancer rates over the general population or a control group. Many positive results could have been attributed to other work environment conditions, and many negative results of reduced cancer rates also occurred.[27]
[edit] Safety standards and licensing
In order to protect the population living around base stations and users of mobile handsets, governments and regulatory bodies adopt safety standards, which translate to limits on exposure levels below a certain value. There are many proposed national and international standards, but that of the International Committee for Non-Ionizing Radiation Protection (ICNIRP) is the most respected one, and has been adopted so far by more than 80 countries. For radio stations, ICNIRP proposes two safety levels: one for occupational exposure, another one for the general population. Currently there are efforts underway to harmonise the different standards in existence.
Radio base licensing procedures have been established in the majority of urban spaces regulated either at municipal/county, provincial/state or national level. Telcos are required to obtain construction licenses, provide certification of antenna emission levels and assure compliance to ICNIRP standards and/or to other environmental legislation. Posterior alterations in the level of emission, number of active antennas or technology standards used in an installed antenna array might require new licensing procedures.
Many governmental bodies also require that competing telcos try to achieve sharing of towers so as to decrease environmental and cosmetic impact. Regarding this issue, it is an influential factor of rejection of installation of new antennas and towers in communities. In some cases, camouflaging the towers like tree trunks and other more visually acceptable structures has been tried.
The safety standards in the U.S. are set by the Federal Communications Commission (FCC). The FCC has based its standards primarily on those standards established by the Institute of Electronics and Electrical Engineering (IEEE), specifically Subcommittee 4 of the "International Committee on Electromagnetic Safety".
[edit] Lawsuits
In the USA, a small number of personal injury lawsuits have been filed by individuals against cellphone manufacturers, such as Motorola, NEC, Siemens and Nokia, on the basis of allegations of causation of brain cancer and death.[28] Many of these cases have been decided in a federal court[citation needed], where it is required that expert testimony relating to science must be first evaluated by a judge, in a Daubert hearing, to be relevant and valid before it is admissible as evidence.[29]
[edit] Precautionary principle
In 2000, the World Health Organization (WHO) recommended that the precautionary principle could be voluntarily adopted in this case.[30] It follows the recommendations of the European Community for environmental risks. According to the WHO, the "precautionary principle" is "a risk management policy applied in circumstances with a high degree of scientific uncertainty, reflecting the need to take action for a potentially serious risk without awaiting the results of scientific research." Other less stringent recommended approaches are prudent avoidance principle and ALARA (As Low as Reasonably Achievable). Although all of these are problematic in application, due to the widespread use and economic importance of wireless telecommunication systems in modern civilization, there is an increased popularity of such measures in the general public. They involve recommendations such as the minimization of cellphone usage, the limitation of use by at-risk population (such as children), the adoption of cellphones and microcells with ALARA levels of radiation, the wider use of hands-off and earphone technologies such as Bluetooth headsets, the adoption of maximal standards of exposure, RF field intensity and distance of base stations antennas from human habitations, and so forth.
[edit] See also
Mobile phones and driving safety
Electromagnetic radiation hazard
Wireless electronic devices and health (computer data wireless)
Specific absorption rate
Radiation biology
Electrical sensitivity
Non-ionizing radiation
[edit] References
^ http://www.bmgf.gv.at/cms/site/ministerium.htm?channel=CH0118&doc=CMS1135774544808
^ http://www.bfs.de/elektro/papiere/empfehlungen_handy.html
^ http://www.ssi.se/ickejoniserande_stralning/Mobiltele/onodig_exponering.html?Menu2=Mobiltelefoni
^ American Journal of Epidemiology 2005 161(6):526-535; doi:10.1093/aje/kwi091 (2005). Long-Term Mobile Phone Use and Brain Tumor Risk". Stefan Lönn, Anders Ahlbom, Per Hall, Maria Feychting
^ G J Hyland (2000). "Physics and biology of mobile telephony". The Lancet 356: 1833-1836.
^ Edition Wissenschaft Nr21
^ REFLEX Projekt
^ Cellular Telephone Use and Risk of Acoustic Neuroma "Cellular Telephone Use and Cancer Risk: Update of a Nationwide Danish Cohort", J. Schuz et.al.
^ SafetyWireless.com analysis
^ http://www.iarc.fr/ENG/Units/RCAd.html
^ Cellular Telephone Use and Risk of Acoustic Neuroma "Cellular Telephone Use and Cancer Risk: Update of a Nationwide Danish Cohort", J. Schuz et.al.
^ American Journal of Epidemiology 2005 161(6):526-535; doi:10.1093/aje/kwi091 (2005). Long-Term Mobile Phone Use and Brain Tumor Risk". Stefan Lönn, Anders Ahlbom, Per Hall, Maria Feychting
^ Br J Cancer. 2005 Oct 3;93(7):842-8. Mobile phone use and risk of acoustic neuroma: results of the Interphone case-control study in five North European countries. Schoemaker MJ, Swerdlow AJ, Ahlbom A, Auvinen A, Blaasaas KG, Cardis E, Christensen HC, Feychting M, Hepworth SJ, Johansen C, Klaeboe L, Lonn S, McKinney PA, Muir K, Raitanen J, Salminen T, Thomsen J, Tynes T
^ American Journal of Epidemiology, doi:10.1093/aje/kwj068 (2006). "Cellular Phones, Cordless Phones, and the Risks of Glioma and Meningioma (Interphone Study Group, Germany) Joachim Schüz, Eva Böhler, Gabriele Berg, Brigitte Schlehofer, Iris Hettinger, Klaus Schlaefer, Jürgen Wahrendorf, Katharina Kunna-Grass, and Maria Blettner
^ Mobile phone use and risk of glioma in 5 North European countries[1]
^ http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1621063 Tumour risk associated with use of cellular telephones or cordless desktop telephones L. Hardell, K. Hansson-Mild, M. Carlberg, F. Söderqvist
^ Lönn S, Ahlbom A, Hall P, Feychting M (2004). "Mobile phone use and the risk of acoustic neuroma". Epidemiology 15 (6): 653-9. PMID 15475713.
^ "Study of the health of people living near mobile phone basestations", R. Santini, P. Santini, J.M. Danze, P. LeRuz, M.Seigne
^ "Salzburg International Conference on Cell Tower Siting "
^ Altpeter, E.S., Krebs, Th., Pfluger, D.H., von Kanel, J., Blattmann, R., et al., 1995: "Study of health effects of Shortwave Transmitter Station of Schwarzenburg, Berne, Switzerland". University of Berne, Institute for Social and Preventative Medicine, August 1995.(Written in English)
^ [http://www.emrnetwork.org/research/santini_pathbio_eng.pdf "Study of the people living near mobile phne base stasions." R.Santini, P. Santini, J.M. Danze, P. LeRuz, M. Seigne]
^ The Microwave Syndrome: Further Aspects of a Spanish Study OBERFELD et.al.
^ "Possible effects of electromagnetic fields from phone masts in population of white stork." A. Balmori
^ "Subjective symptoms, sleeping problems, and cognitive performance in subjects living near mobile phone base stations", H-P Hutter, H Moshammer, P Wallner and M Kundi
^ "Neurobehaviorial effects among inhibitants around mobile base stations." G. Abdel-Rassoul et.al.
^ WHO database
^ "Cell phones and cancer: what is the evidence for a connetion?" J.E.Moulder et.al.
^ Wright v. Motorola, Inc. et al., No95-L-04929
^ Newman v. Motorola
^ 'WHO Electromagnetic Fields and Public Health Cautionary Policies
[edit] External links
[edit] Independent Organisations
WHO International EMF Program
International Commission on Non-Ionizing Radiation Protection (ICNIRP)
Independent Expert Group on Mobile Phones (IEGMP), UK
The International Commission for Electromagnetic Safety (ICEMS)
SAR chart for common models of cellular phones
[edit] Government
FDA Cell Phone Facts
FCC Radio Frequency Safety
Medline PLus, by US National Library of Medicine and National Institues f Health(NIH)
[edit] Industry
MMF Mobile Manufacturers Forum
[edit] Web news aggegators
A Biomedical Science and Engineering Clearinghouse on Electric and Magnetic Fields. EMF-Link.
Microwave News Reporting on electromagnetic fields and radiation since 1981.
EMF Portal International EMF Information Source and Database of Scientific Literature on Bioelectromagnetic Interaction, Aachen University Hospital, Germany.
.. Pre-expand include size: 10713 bytes Post-expand include size: 6234 bytes Template argument size: 1500 bytes Maximum: 2048000 bytes -->.. Saved in parser cache with key enwiki:pcache:idhash:1272748-0!1!0!default!!en!2 and timestamp 20070330171044 -->
Retrieved from "http://en.wikipedia.org/wiki/Mobile_phone_radiation_and_health"
Categories: Articles with unsourced statements since February 2007 | All articles with unsourced statements | Articles with unsourced statements since March 2007 | Public health | Radiobiology | Mobile telephony
2:54 AM - 0 Comments - 0 Kudos - Add Comment
More on the cellphone hazard--truth and fiction
Category: Life
I have written over 100 posts on bioelectromagnetic fields, health issues, and the mobil phone controversy. www.yahoogroups.com/tech/bioelectromagnetics
has hundreds of posts on the subject, as well as the "Bioelectromagnetics Journal" published by the Bioelectromagnetics Society in the USA. The following article collectioin is from the online open library "Wikipedia" which I also participate in.
Scott Hill
frontier sciences group
Copenhagen
http://www.myspace.com/frontiersciences
http://frontiersciences.spaces.live.com
Mobile phone radiation and health
From Wikipedia, the free encyclopedia
Jump to: navigation, search
.. start content -->
A Greenfield-type tower used in base stations for mobile telephony
A modern mobile phone (Samsung)
Mobile phone radiation and health concerns have been raised, especially following the enormous increase in the use of wireless mobile telephony throughout the world (as of August 2005, there were more than 2 billion users worldwide). This is because mobile phones use electromagnetic waves in the microwave range. These concerns have induced a large body of research (both epidemiological and experimental, in non-human animals as well as in humans). Concerns about effects on health have also been raised regarding other digital wireless systems, such as data communication networks.
The World Health Organization has officially ruled out adverse health effects from cellular base stations and wireless data networks, and expects to make recommendations about mobile phones in 2007-08 [3][4].
However, some National Radiation Protection Authorities, i.e. Austria[1] Germany[2] and Sweden,[3] recommends their citizens to minimize radiation. Examples of recommendations are:
Use hands-free to decrease the radiation to the head
Keep the mobile phone away from the body.
Do not telephone in a car without an external antenna.
..> Contents
[hide]
1 Health hazards of handsets
1.1 Thermal effects
1.2 Non-thermal effects
1.3 Genotoxical effects
1.4 Mobile phones and cancer
1.5 Electromagnetic hypersensitivity syndrome
2 Health hazards of base stations
3 Occupational health hazards
4 Safety standards and licensing
5 Lawsuits
6 Precautionary principle
7 See also
8 References
9 External links
9.1 Independent Organisations
9.2 Government
9.3 Industry
9.4 Web news aggegators
..>
.. type=text/javascript> //..[CDATA[ if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); } //]]> ..>
[edit] Health hazards of handsets
Calculated specific absorbed radiation (SAR) distribution in an anatomical model of head next to a 125 mW dipole antenna. Peak SAR is 9.5 W/kg over 1 mg, whole head average is 0.008 W/kg. (USAF/AFRL).
Part of the radio waves emitted by a mobile telephone handset are absorbed by the human head. The radio waves emitted by a GSM handset, can have a peak power of 2 watts, and a US analog phone had a maximum transmit power of 3.6 watts. Other digital mobile technologies, such as CDMA and TDMA, use lower output power, typically below 1 watt. The maximum power output from a mobile phone is regulated by the mobile phone standard it is following and by the regulatory agencies in each country. In most systems the cellphone and the base station check reception quality and signal strength and the power level is increased or decreased automatically, within a certain span, to accommodate for different situations such as inside or outside of buildings and vehicles.
The rate at which radiation is absorbed by the human body is measured by the Specific Absorption Rate (SAR), and its maximum levels for modern handsets have been set by governmental regulating agencies in many countries. In the USA, the FCC has set a SAR limit of 1.6 W/kg, averaged over a volume of 1 gram of tissue, for the head. In Europe, the limit is 2 W/kg, averaged over a volume of 10 grams of tissue. SAR values are heavily dependent on the size of the averaging volume. Without information about the averaging volume used comparisons between different measurements can not be made. Thus, the European 10-gram ratings should be compared among themselves, and the American 1-gram ratings should only be compared among themselves.
[edit] Thermal effects
Microscope photographs of lenses incubated in organ culture conditions for 12 days. Right frame shows Control lens with no damage. Bottom frame demonstrates the effect of microwave radiation on bovine lens sutures for a total exposure of 192 cycles (1.1 GHz, 2.22 mW). Each cycle lasts 50 min followed by 10 min pause. In the absence of microwave radiation, the bubbles are generated by temperature increase to 39.5 °C during 4 h; see left frame. Credit: IsraCast Technology News [2]
One well-understood effect of microwave radiation is dielectric heating, in which any dielectric material (such as living tissue) is heated by rotations of polar molecules induced by the electromagnetic field. In the case of a person using a cell phone, most of the heating effect may occur in the head surface, causing its temperature to increase by a fraction of a degree. The level of temperature increase is an order of magnitude less than that obtained during the exposure of the head to direct sunlight. The brain's blood circulation easily disposes of excess heat by instantaneously increasing local blood flow. However, the cornea of the eye does not have this temperature regulation mechanism. Premature cataracts are known as an occupational disease of engineers who work on high power radio transmitters at similar frequencies.[citation needed] Premature cataracts however, have not been linked with cell phone use, possibly because of the lower power output of mobile phones.
It has been claimed that some parts of the human head are more sensitive to damage due to increases in temperature, particularly in anatomical structures with poor vasculature, such as nerve fibers. More recent results from a Swedish scientific team at the Karolinska Institute (Lonn, Ahlbom, Hall and Feychting) have suggested that continuous use of a mobile phone for a decade or longer can lead to a small increase in the probability of getting acoustic neuroma, a type of brain tumor. The increase was not noted in those who used phones for less than 10 years.[4]
[edit] Non-thermal effects
The communications protocols used by mobile phones often result in low-frequency pulsing of the carrier signal. These low frequencies are similar to those that exist in the electrical oscillations of the human body, specifically the alpha and delta brain waves[citation needed]. No experimental results to date have indicated that this hypothesis is valid.[5]
Other researchers have argued that the so-called "non-thermal effects" could be reinterpreted as a normal cellular response to an increase in temperature. The noted German biophysicist Roland Glaser, for example in,[6] has argued that there are several thermoreceptor molecules in cells, and that they activate a cascade of second and third messenger systems, gene expression mechanisms and production of heat shock proteins in order to defend the cell against metabolic cell stress caused by heat. The increases in temperature that cause these changes are too small to be detected by studies such as REFLEX, which base their whole argument on the apparent stability of thermal equilibrium in their cell cultures.
[edit] Genotoxical effects
It has for a long time been known that Microwave radiation can cause break in DNA-strings[citation needed]. In December 2004 a pan-European study named REFLEX (Risk Evaluation of Potential Environmental Hazards from Low Energy Electromagnetic Field (EMF) Exposure Using Sensitive in vitro Methods), involving 12 collaborating laboratories in several countries showed some compelling evidence of DNA damage of cells in in-vitro cultures, when exposed between 0.3 to 2 watts/kg, whole-sample average. There were indications, but not rigorous evidence of other cell changes, including damage to chromosomes, alterations in the activity of certain genes and a boosted rate of cell division.[7]
[edit] Mobile phones and cancer
In 2006 a large Danish study about the connection between mobile phone use and cancer incidence was published. It followed over 420,000 danish citizens over 20 years and showed no increased risk of cancer.[8] Some scientists claim that the design of the study was flawed in favor of finding no links.[9]
In order to investigate the risk of cancer for the Mobile Phone user, a cooperative project between 13 countries has been launched called INTERPHONE. The idea is that cancers need time to develop so only studies over 10 years are of interest.[10]
Following studies of long time exposure have been published:
A Danish study (2004) had too few longtime users to be conclusive at 10 years.[11]
A Swedish study (2005) that draws the conclusion that "the data do not support the hypothesis that mobile phone use is related to an increased risk of glioma or meningioma."[12]
A British study (2005) that draws the conclusion that "The study suggests that there is no substantial risk of acoustic neuroma in the first decade after starting mobile phone use. However, an increase in risk after longer term use or after a longer lag period could not be ruled out."[13]
A German study (2006) that draws the conclusion that " In conclusion, no overall increased risk of glioma or meningioma was observed among these cellular phone users; however, for long-term cellular phone users, results need to be confirmed before firm conclusions can be drawn."[14].
A joint study that draws the conclusion that "Although our results overall do not indicate an increased risk of glioma in relation to mobile phone use, the possible risk in the most heavily exposed part of the brain with long-term use needs to be explored further before firm conclusions can be drawn."[15]
Other studies on cancer are:
Tumour risk associated with use of cellular telephones or cordless desktop telephones,that says: "We found for all studied phone types an increased risk for brain tumours, mainly acoustic neuroma and malignant brain tumours".[16]
A Swedish study (2004) concludes: "Our findings do not indicate an increased risk of acoustic neuroma related to short-term mobile phone use after a short latency period. However, our data suggest an increased risk of acoustic neuroma associated with mobile phone use of at least 10 years' duration.".[17]
[edit] Electromagnetic hypersensitivity syndrome
Many[citation needed] users of mobile handsets have reported feeling several unspecific symptoms during and after its use, such as burning and tingling sensations in the skin of the head and extremities, fatigue, sleep disturbances, dizziness, loss of mental attention, reaction times and memory retentiveness, headaches, malaise, tachycardia (heart palpitations) and disturbances of the digestive system. Some researchers, implying a causal relationship, have named this syndrome as a new diagnostic entity, EHS or ES (electrosensitivity). The World Health Organization prefers to name it "idiopathic environmental intolerance", in order to avoid the implication of causation.
[edit] Health hazards of base stations
Another area of worry about effects on the population's health have been the radiation emitted by base stations (the antennas on the surface which communicate with the phones), because, in contrast to mobile handsets, it is emitted continuously and is much more powerful. Due to the attenuation of power with the square of distance, field intensities drop rapidly with distance away from the base of the antenna. A 2002 survey study by Santini et al. found a variety of health effects for people who reported that they were living within 1,000 feet (325 meters) of cell towers in rural areas; or within 300 feet (100 meters) of base stations in urban areas. Fatigue, headache, sleep disruption and loss of memory were among the effects found.[18]
As technology progresses and data demands have increased on the mobile network, the number of towers has increased sharply in many cities, and competing companies usually do not make an effort towards sharing towers[citation needed]. The latest trend is 3G towers, which work with higher bandwidths. The buildup of networks has sparked many health concerns and much community outrage[citation needed]. Examples of such can be seen from headlines around the world; locals pulling down base station masts, or even, in some countries, physically attacking installation crews, communities lobbying against the rollout of cell networks, protest banners, demonstrations near hospitals, houses and local schools[citation needed].
Many measurements and experiments have shown that transmitter power levels are relatively low - in modern 2G antennas, in the range of 20 to 100 watts, with the 3G towers causing less radiation than the already present 2G network. An average radiation power output of 3 watt is used. 'Micro-cell geometries' inside cities have decreased the amount of irradiated power even further.[citation needed]
The radiation exposure from these antennas, while generally low level, is still continuous. Some scientists [19] believe that chronic, low-level radiation exposure may, over time, may be as harmful as higher-level, acute radiation exposures (as from cell phone use).
There are recent (Jan 2007) reliable, well conducted and long-range epidemiological studies published on health effects of radio and base stations in Schwizerland (Schwarzenburg),[20] France,[21] Spain[22] and,[23] Austria[24] and Egypt.[25] There is yet no study reporting no effect at all in WHO EMF database.[26]
[edit] Occupational health hazards
Telecommunication workers who spend time at a short distance from the active equipment, for the purposes of testing, maintenance, installation, etc. may be at risk of much greater exposure than the general population. Many times base stations are not turned off during maintenance, because that would affect the network, so people work near "live" antennas.
A variety of studies over the past 50 years have been done on workers exposed to high RF radiation levels: Studies including radar laboratory workers, military radar workers, electrical workers, amateur radio operators. Most of these studies found no increase in cancer rates over the general population or a control group. Many positive results could have been attributed to other work environment conditions, and many negative results of reduced cancer rates also occurred.[27]
[edit] Safety standards and licensing
In order to protect the population living around base stations and users of mobile handsets, governments and regulatory bodies adopt safety standards, which translate to limits on exposure levels below a certain value. There are many proposed national and international standards, but that of the International Committee for Non-Ionizing Radiation Protection (ICNIRP) is the most respected one, and has been adopted so far by more than 80 countries. For radio stations, ICNIRP proposes two safety levels: one for occupational exposure, another one for the general population. Currently there are efforts underway to harmonise the different standards in existence.
Radio base licensing procedures have been established in the majority of urban spaces regulated either at municipal/county, provincial/state or national level. Telcos are required to obtain construction licenses, provide certification of antenna emission levels and assure compliance to ICNIRP standards and/or to other environmental legislation. Posterior alterations in the level of emission, number of active antennas or technology standards used in an installed antenna array might require new licensing procedures.
Many governmental bodies also require that competing telcos try to achieve sharing of towers so as to decrease environmental and cosmetic impact. Regarding this issue, it is an influential factor of rejection of installation of new antennas and towers in communities. In some cases, camouflaging the towers like tree trunks and other more visually acceptable structures has been tried.
The safety standards in the U.S. are set by the Federal Communications Commission (FCC). The FCC has based its standards primarily on those standards established by the Institute of Electronics and Electrical Engineering (IEEE), specifically Subcommittee 4 of the "International Committee on Electromagnetic Safety".
[edit] Lawsuits
In the USA, a small number of personal injury lawsuits have been filed by individuals against cellphone manufacturers, such as Motorola, NEC, Siemens and Nokia, on the basis of allegations of causation of brain cancer and death.[28] Many of these cases have been decided in a federal court[citation needed], where it is required that expert testimony relating to science must be first evaluated by a judge, in a Daubert hearing, to be relevant and valid before it is admissible as evidence.[29]
[edit] Precautionary principle
In 2000, the World Health Organization (WHO) recommended that the precautionary principle could be voluntarily adopted in this case.[30] It follows the recommendations of the European Community for environmental risks. According to the WHO, the "precautionary principle" is "a risk management policy applied in circumstances with a high degree of scientific uncertainty, reflecting the need to take action for a potentially serious risk without awaiting the results of scientific research." Other less stringent recommended approaches are prudent avoidance principle and ALARA (As Low as Reasonably Achievable). Although all of these are problematic in application, due to the widespread use and economic importance of wireless telecommunication systems in modern civilization, there is an increased popularity of such measures in the general public. They involve recommendations such as the minimization of cellphone usage, the limitation of use by at-risk population (such as children), the adoption of cellphones and microcells with ALARA levels of radiation, the wider use of hands-off and earphone technologies such as Bluetooth headsets, the adoption of maximal standards of exposure, RF field intensity and distance of base stations antennas from human habitations, and so forth.
[edit] See also
Mobile phones and driving safety
Electromagnetic radiation hazard
Wireless electronic devices and health (computer data wireless)
Specific absorption rate
Radiation biology
Electrical sensitivity
Non-ionizing radiation
[edit] References
^ http://www.bmgf.gv.at/cms/site/ministerium.htm?channel=CH0118&doc=CMS1135774544808
^ http://www.bfs.de/elektro/papiere/empfehlungen_handy.html
^ http://www.ssi.se/ickejoniserande_stralning/Mobiltele/onodig_exponering.html?Menu2=Mobiltelefoni
^ American Journal of Epidemiology 2005 161(6):526-535; doi:10.1093/aje/kwi091 (2005). Long-Term Mobile Phone Use and Brain Tumor Risk". Stefan Lönn, Anders Ahlbom, Per Hall, Maria Feychting
^ G J Hyland (2000). "Physics and biology of mobile telephony". The Lancet 356: 1833-1836.
^ Edition Wissenschaft Nr21
^ REFLEX Projekt
^ Cellular Telephone Use and Risk of Acoustic Neuroma "Cellular Telephone Use and Cancer Risk: Update of a Nationwide Danish Cohort", J. Schuz et.al.
^ SafetyWireless.com analysis
^ http://www.iarc.fr/ENG/Units/RCAd.html
^ Cellular Telephone Use and Risk of Acoustic Neuroma "Cellular Telephone Use and Cancer Risk: Update of a Nationwide Danish Cohort", J. Schuz et.al.
^ American Journal of Epidemiology 2005 161(6):526-535; doi:10.1093/aje/kwi091 (2005). Long-Term Mobile Phone Use and Brain Tumor Risk". Stefan Lönn, Anders Ahlbom, Per Hall, Maria Feychting
^ Br J Cancer. 2005 Oct 3;93(7):842-8. Mobile phone use and risk of acoustic neuroma: results of the Interphone case-control study in five North European countries. Schoemaker MJ, Swerdlow AJ, Ahlbom A, Auvinen A, Blaasaas KG, Cardis E, Christensen HC, Feychting M, Hepworth SJ, Johansen C, Klaeboe L, Lonn S, McKinney PA, Muir K, Raitanen J, Salminen T, Thomsen J, Tynes T
^ American Journal of Epidemiology, doi:10.1093/aje/kwj068 (2006). "Cellular Phones, Cordless Phones, and the Risks of Glioma and Meningioma (Interphone Study Group, Germany) Joachim Schüz, Eva Böhler, Gabriele Berg, Brigitte Schlehofer, Iris Hettinger, Klaus Schlaefer, Jürgen Wahrendorf, Katharina Kunna-Grass, and Maria Blettner
^ Mobile phone use and risk of glioma in 5 North European countries[1]
^ http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1621063 Tumour risk associated with use of cellular telephones or cordless desktop telephones L. Hardell, K. Hansson-Mild, M. Carlberg, F. Söderqvist
^ Lönn S, Ahlbom A, Hall P, Feychting M (2004). "Mobile phone use and the risk of acoustic neuroma". Epidemiology 15 (6): 653-9. PMID 15475713.
^ "Study of the health of people living near mobile phone basestations", R. Santini, P. Santini, J.M. Danze, P. LeRuz, M.Seigne
^ "Salzburg International Conference on Cell Tower Siting "
^ Altpeter, E.S., Krebs, Th., Pfluger, D.H., von Kanel, J., Blattmann, R., et al., 1995: "Study of health effects of Shortwave Transmitter Station of Schwarzenburg, Berne, Switzerland". University of Berne, Institute for Social and Preventative Medicine, August 1995.(Written in English)
^ [http://www.emrnetwork.org/research/santini_pathbio_eng.pdf "Study of the people living near mobile phne base stasions." R.Santini, P. Santini, J.M. Danze, P. LeRuz, M. Seigne]
^ The Microwave Syndrome: Further Aspects of a Spanish Study OBERFELD et.al.
^ "Possible effects of electromagnetic fields from phone masts in population of white stork." A. Balmori
^ "Subjective symptoms, sleeping problems, and cognitive performance in subjects living near mobile phone base stations", H-P Hutter, H Moshammer, P Wallner and M Kundi
^ "Neurobehaviorial effects among inhibitants around mobile base stations." G. Abdel-Rassoul et.al.
^ WHO database
^ "Cell phones and cancer: what is the evidence for a connetion?" J.E.Moulder et.al.
^ Wright v. Motorola, Inc. et al., No95-L-04929
^ Newman v. Motorola
^ 'WHO Electromagnetic Fields and Public Health Cautionary Policies
[edit] External links
[edit] Independent Organisations
WHO International EMF Program
International Commission on Non-Ionizing Radiation Protection (ICNIRP)
Independent Expert Group on Mobile Phones (IEGMP), UK
The International Commission for Electromagnetic Safety (ICEMS)
SAR chart for common models of cellular phones
[edit] Government
FDA Cell Phone Facts
FCC Radio Frequency Safety
Medline PLus, by US National Library of Medicine and National Institues f Health(NIH)
[edit] Industry
MMF Mobile Manufacturers Forum
[edit] Web news aggegators
A Biomedical Science and Engineering Clearinghouse on Electric and Magnetic Fields. EMF-Link.
Microwave News Reporting on electromagnetic fields and radiation since 1981.
EMF Portal International EMF Information Source and Database of Scientific Literature on Bioelectromagnetic Interaction, Aachen University Hospital, Germany.
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Categories: Articles with unsourced statements since February 2007 | All articles with unsourced statements | Articles with unsourced statements since March 2007 | Public health | Radiobiology | Mobile telephony
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