Cellphones and the Associated Radiation Risk

 There's a lot of discussion nowadays about the radiation risk of cellphones.  Some sectors are very worried about the effect of the radiation on the brain - especially when you hold the phone too close to your ear. Unfortunately, for me, I'm not going to hear ANYTHING if I hold the phone 2 inches from my ear.  Maybe the better option is to investigate other possibilities, like the comparison below
        . . . .  June

 
Radiation Risk: Are Some Cellphones More Dangerous Than Others?
By Natalie Wolchover, Life's Little Mysteries Staff Writer
LiveScience.com | LiveScience.com – Thu, 23 Jun, 2011

Last month, the International Agency for Research on Cancer, a branch of the World Health Organization, declared cellphone radiation 'possibly carcinogenic to humans.' The scientific evidence linking cellphone use to brain cancer isn't conclusive, the agency said, but there is some evidence that brain cancer rates are higher among people with the highest levels of cellphone exposure, and cellphone users should take precautions until more is known.

. . . . .
Moskowitz also thinks people should avoid keeping their cellphones on in their pockets. "There's accumulating evidence of a risk to sperm and male fertility," Moskowitz said. "People are forgetting where they're keeping their cellphones all day long."

Foster doesn't believe cellphone radiation poses a significant danger, but he still suggests that people take precautions if they're worried, just for peace of mind. "My best advice to consumers: If they are concerned about possible radiation risks from cellphones, use a hands-free kit, which actually does reduce exposure and costs very little."

Now, some scientists are claiming that certain types of cellphones could be more "possibly carcinogenic" than others.

"I've been telling friends and family members to seriously consider switching to CDMA [cellphones] if they're using GSM cellphones," said Joel Moskowitz, the director of the Center for Family and Community Health at the University of California, Berkeley.

CDMA, or Code Division Multiple Access, is the type of cellular network used by the phone companies Verizon and Sprint. GSM, or Global System for Mobile Communications, is the type used by AT&T and T-Mobile.

Higher power
There is accumulating evidence that cellphones that operate on GSM networks emit significantly more radiation than do cellphones operating on CDMA networks. This is not apparent when you look at a phone's specs, Moskowitz said, because phone companies are required to list only the "specific absorption rate" (SAR) — the measure of the rate at which energy from a radio frequency electromagnetic field is absorbed by the body — of a phone at its maximum radiation output. "The SAR can be misleading as it measures the maximum radiation a cellphone emits and does not reflect the average amount of radiation it emits,"

Several recent studies have shown that CDMA phones normally emit a small fraction of their maximum radiation output, while GSM phones emit, on average, half the maximum, he explained. This comes down to the different radio frequency (RF) bands that the two networks operate on, and the different methods by which the two networks carry phone transmissions.

"When a GSM phone transmits, it immediately goes to the peak power, and then the power control circuitry ratchets down the power to an acceptable level," explained Mark McNeeley, an electrical engineer at Exponent Engineering and Scientific Consulting services and co-author of a recent study comparing GSM and CDMA networks. "CDMA networks share the same frequency among many different phone calls, so all phones transmit at the lowest possible power level necessary to maintain the fidelity of the call." It's like people talking quietly at a party, he said.

The radiation spikes at the beginning of GSM phone calls means that they emit, overall, up to 28 times more radiation than CDMA phones, according to a study co-authored by McNeeley and published last year in the Journal of Exposure Science and Environmental Epidemiology.

There are exceptions. If you have a CDMA phone in a rural area and the nearest CDMA cellphone tower is far away, then you have to broadcast at a radiation level that is equal to or greater than GSM to reach the tower, McNeeley said. If there is a GSM tower much nearer to you, you might be better off going with a GSM network, he said; but in most parts of the country, where both CDMA and GSM towers are ubiquitous, CDMA phones will emit less radiation than GSM phones.

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