Senior scientist Dr John Bucher at the National Toxicology Programme in Durham, North Carolina said: "The exposures used in the studies can not be compared directly to the exposure that humans experience when using a cell phone".
"The exposures used in the studies can not be compared directly to the exposure that humans experience when using a cell phone", John Bucher, a senior scientist with the National Toxicology Program, said in a statement. The studies also found evidence that the radiation was linked to tumors in male rats' brains and adrenal glands.
Indeed, the only clear link between cellphone radiation and cancer was found among male rats (not female rats or male or female mice), and the researchers stressed that the findings do not apply to humans.
What does this mean for us?"In addition, the exposure levels and durations in our studies were greater than what people experience", Bucher explained. Bucher added that the mice were also exposed to radiation across their whole bodies, which is not what happens in people, who instead receive only local exposure to the specific area where they hold the phone. More news: Amazon drops free-shipping minimum for all customers
The study saw its rats subjected to the lowest exposure level that is equal to the maximum local tissue exposure now allowed for cell phone users.
An oversight of the study was that it did not investigate RFR used in Wi-Fi, 4G or 5G, the latter of which "likely differs dramatically from what we studied", the researchers said. The studies didn't look into the kinds of RFR used for WiFi or 5G networks.
"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.
Moreover, the rat study examined the effects of a radio frequency associated with an early generation of mobile technology, one that fell out of routine use years ago. A =level such as this, four times higher than the maximum power level permitted, rarely if ever occurs with typical cell phone use.
"We agree that these findings should not be applied to human cell phone usage", the FDA's Dr. Jeffrey Shuren said in a statement. The higher frequencies used by current cellphones can not penetrate the tissues of humans and rats as easily as the previously used frequencies.More news: Rihanna shuts down Donald Trump over his 'tragic' rallies
"Based on our results, we are planning further studies to confirm that the experimental evidence continues to support this".
Lead toxicologist on the studies Dr Bucher said: "A major strength of our studies is that we were able to control exactly how much radio frequency radiation the animals received - something that's not possible when studying human cell phone use, which has often relied on questionnaires". We believe the existing safety limits for cell phones remain acceptable for protecting the public health'.
The final reports represent the consensus of NTP and a panel of external scientific experts who reviewed the studies in March after draft reports were issued in February.
The studies could be an important step to understanding RFR's impact on humans.
"I have not changed the way I use a cell phone", Bucher said.More news: Zimbabwe's controversial Prophet Magaya retracts HIV cure claims