The results of these experiments, replicated by the media, was shocking - it turned out that the simulated radiation of the telephone gave rise to malignant tumors - gliomas in the brain and schwannoma in the heart.
Even though the study was conducted on rodents that were exposed to higher levels than humans, the association between the phones and cancer was evident in male rats.
The Food and Drug Administration said it concurs that the research doesn't indicate people have any risk of cancer from using cellphones. And "these findings should not be applied to human cellphone usage", said Dr. Jeffrey Shuren, FDA's chief of radiological health. "Tumors of the brain were also considered to be related to exposure; and increased numbers of male rats with tumors of the adrenal gland were also related to exposure".
However, those tempted to toss away today's most important tool of communications may want to consider that the study's researchers did specify the levels of radiation the rats were subjected to were not comparable to those humans are exposed to.
"Animal studies like this one contribute to our discussions on this topic, but we must remember the study was not created to test the safety of cellphone use in humans, so we can not draw conclusions about the risks of cellphone use from it", Dr. Jeffrey Shuren, director of the Food and Drug Administration's Center for Devices and Radiological Health, who was not involved with the study, said in a statement.
The debate over whether cellphones can cause cancer is sure to reignite as a new government report says that rats developed cancer after being exposed to high levels of cellphone radiation. Additionally, cardiac Schwann cell hyperplasia occurred in groups of male rats exposed to both GSM- and CDMA-modulated cell phone RFR.
Male rats, exposed to high levels of radio frequency radiation (RFR), like that used in 2G and 3G cell phones, developed cancerous heart tumours. As scientists often say, more study is needed.
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The rats were exposed to radiation at a frequency of 900 megahertz, typical of the second generation of cellphones that prevailed in the 1990s, when the study was first conceived. "In addition, the exposure levels and durations in our studies were greater than what people experience", Bucher explained. For comparison, fourth generation (4G) and fifth generation (5G) phones employ much higher frequencies, which are "far less successful at penetrating the bodies of humans and rats", the New York Times reports.
NTP is building smaller RFR exposure chambers that will make it easier to evaluate newer telecommunications technologies in weeks or months, rather than years.
"Based on our results, we are planning further studies to confirm that the experimental evidence continues to support this".
'The US IEEE-FCC human safety guidelines for wireless radiation which only protect against thermal heating or burning were scientifically false decades ago, ' said Dr Paul Heroux, a McGill University physicist and toxicologist.
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.
Others who study risk aren't hanging up.