"The study also found that about 5-7 per cent of the male rats exposed to the highest level of radiation developed certain heart tumours, called schwannomas, compared to none in the control group", the NYT reports.
According to final reports of the study, there is clear evidence that male rats exposed to high levels of radio frequency radiation developed these tumours. However, researchers notes the evidence was less clear when it came to female rats. But he cautioned that the exposure levels and durations were far more significant than what people typically encounter, and thus can not "be compared directly to the exposure that humans experience".
"Not carrying the phone in your trousers, or your bra or your shirt pocket, and not allowing children to use cellphones, because they're most vulnerable to this radiation; it penetrates deeper into their bodies", says Scarato. "In addition, the exposure levels and durations in our studies were greater than what people experience", Bucher explained.
Asked about his own cellphone use, Bucher said he had never been a heavy user but, in light of the study, was now "a little more aware" of his usage.
"We believe that the link between radio frequency radiation and tumors in male rats is real", John Bucher, a senior scientist at NTP, said in a statement. The tests for the study were done on rodents at levels much higher than humans are now exposed to.
Scientists have divided these rodents into several groups, each of which received a different dose of irradiation, since the maximum allowed for mobile phones and ending levels exceeding this figure by about 3-4 times.
A National Institutes of Health study released on Thursday warns that cell phone radiation can cause cancers of the heart, brain and adrenal glands.
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The rats were exposed to radiation at a frequency of 900 megahertz, the frequency used in the second generation of mobile phones that prevailed in the 90s when the study was first conceived.
Interestingly, the team found that rats exposed to whole body RFR lived longer than rats unexposed to any radiation.
Strangely, however, the studies found that exposure in male rats actually lengthened their lifespan, possibly linked with a decrease in chronic kidney problems found in older rats. For future studies, researchers aim to build smaller RFR chambers to evaluate newer telecommunications technology in a matter of months, rather than years. The radiation began in the womb or early in life and lasted for up to two years, which is most of the animals' lifetime. For two years, the animals were exposed to RFR for up to nine hours a day. RFR levels ranged from 1.5 to 6 watts per kilogram in rats, and 2.5 to 10 watts per kilogram in mice. These may include changes in metrics like DNA damage in exposed tissues, which can be detected much sooner than cancer.
The National Toxicology Program is an inter-agency program headquartered at the National Institutes of Health. The NTP will provide the results of the studies to FDA and the Federal Communications Commission, who will review the information to monitor the potential impacts of RFR.
The Food and Drug Administration (FDA), which oversees cellphone safety, disagreed with the risk upgrade.
"Based on our ongoing evaluation of this issue, the totality of the available scientific evidence continues to not support adverse health effects in humans caused by exposures at or under the current radiofrequency energy exposure limits", Shuren said. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases.
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