In the studies, which lasted 2 years, rats and mice of both sexes ran freely in specially constructed reverberation chambers where their entire bodies were exposed to radiation. "These studies should have been done before more than 90 per cent of us, including children, started using this technology day in and day out".
Researchers at the National Toxicology Program found that there was "some evidence of carcinogenic activity" from cellphone radiation in male rats. Most groups were exposed to nine hours of radio waves per day for two years. And earlier this December, the California Department of Public Health released its long debated-over and controversial guidelines on how to lower your exposure to mobile phone radiation, amidst criticisms the guidelines were overzealous and would only further stoke confusion for the public.
The pair of studies are the largest the National Toxicology Program has ever conducted about the carcinogenic effects of cell phone radiation.
The study specifically used 2G and 3G frequencies - not the frequencies used on more advanced 4G or 5G networks.
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The voluminous but sometimes puzzling results also aren't likely to prompt USA agencies or other bodies to immediately change how they regulate the ubiquitous devices or view their health risks.
High exposure to the type of radiofrequency radiation emitted by mobile phones has been linked to tumours in the hearts of male rats, but not female rats or any mice, according to a draft of U.S. government studies. EHT is a scientific think tank focused on preventable environmental health risks and will be publishing a series of expert reactions to the NTP technical reports this week. The amount of radiation to which the laboratory animals were exposed included the levels emitted by cellphones millions of people use everyday.
Other agencies are studying cellphone use in people and trying to determine whether it is linked to the incidence of any type of cancer, Dr. Bucher says.
Cellphones typically emit lower levels of radiation than maximum levels allowed, the draft report said. About 6 percent of the rats exposed to the highest level of radiation studied developed schwannomas in their hearts, whereas there was no evidence of schwannomas in a group of rats that were not exposed to radiation, according to John Bucher, a senior scientist at the NTP.
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"We don't have any idea really", Bucher said. In the short term, however, a new study on rats suggests we should be okay.
EWG has been at the forefront of public interest organizations raising concerns about cellphone use and cancer.
The new findings are "incredibly important", says David Carpenter, a public health physician at the State University of NY in Albany who has long warned of cellphone dangers. Even with frequent daily use by the vast majority of adults, we have not seen an increase in events like brain tumors.
"International and USA organizations and health experts have maintained their longstanding conclusion that the scientific evidence shows no known health risk due to the RF energy emitted by cellphones", said Justin Cole, a spokesman for the trade group. "We believe the current safety limits for cellphones are acceptable for protecting the public health".
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