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. 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".
The lowest level of radiation was equivalent to the maximum level that cellphones are allowed to emit in the U.S. But the researchers noted that a typical cellphone user rarely ever reaches this level. The highest exposure level in the studies was four times higher than the maximum power level permitted. So, basically, while that whole "your cellphone gives you brain cancer" myth your mom's been harping on you about isn't 100 percent disproven, there really isn't a lot of evidence to support it.This specific cellphone cancer study, which was conducted by the National Toxicology Program (NTP), has been going on for decades, according to The New York Times.
"When the current studies were being designed, 2G technology was the industry standard, and 3G technologies were under development".
"We note NTP's own assessment that today's report can not be extrapolated to human cell phone usage, and the Food and Drug Administration's concurrence that "these findings should not be applied to human cell phone usage" and that 'the existing safety limits for cell phones remain acceptable for protecting the public health.' These conclusions are consistent with official federal brain tumor statistics showing that since the introduction of cellphones in the mid-1980s, the rate of brain tumors in the United States has decreased".
In a seeming contradiction, male rats exposed to cellphone signals lived longer than rats not exposed. "This may be explained by an observed decrease in chronic kidney problems that are often the cause of death in older rats", Wyde said.
For the study, the team housed the animals in chambers specifically designed for the study.
The studies saw RFR exposure begin as early as the womb for rat test subjects and continue for up to two years (the subjects' natural lifespans). The animals were exposed for up to two years, for about nine hours a day (with 10 minutes of exposure and 10-minute breaks in between).
In addition, the RFR levels ranged from 1.5-6 watts per kilogram in rats, and 2.5-10 watts per kilogram in mice.
Studies didn't investigate radiation used for Wi-Fi or 5G networks. "From what we now understand, it likely differs dramatically from what we studied", said Wyde.
The NTP researchers are planning future studies on the effects of newer technologies, and these studies will use different methods so that they will be completed in weeks to months, rather than years.
These studies will focus on developing measurable physical indicators of potential effects from RFR, including changes in metrics like DNA damage in exposed tissues.
According to Dr. Jeffrey Shuren, the U.S. FDA's director for Devices and Radiological Health, such animal studies are important in the discussion, but it was not created to test the safety of cellphones in humans and could therefore not be used to draw conclusions for humans.
But you probably don't need to be too anxious about these results, for one important reason: You are not a male rat.
More information on the categories is available at https://ntp.niehs.nih.gov/results/pubs/longterm/defs/index.html.
A former science chief for the Environmental Protection Agency, Gray said the toxicology program examined how cellphone radiation affected animals.