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WASHINGTON – A toxicological study has clearly shown that male rats exposed to high radio frequency (RFR) levels such as those used in 2G and 3G cell phones develop cancerous heart tumors, although the results can not be directly compared to the human experience.
The National Toxicology Program (NTP) final reports released the other day also provided evidence of tumors in the brain and adrenal gland of exposed male rats.
But for female rats and male and female mice, According to reports, the evidence was equivocal as to whether the cancers observed were related to radiation exposure.
"The exposures used in the studies can not be directly compared to the exposure experienced by humans when using a cell phone," Bucher said. , Senior Scientist of NTP.
"In our studies, rats and mice received radiofrequency radiation all over their body. On the other hand, people are mainly exposed in specific local tissues close to where they hold the phone. In addition, exposure levels and exposure times in our studies were higher than what people have experienced, "said Bucher.
The final reports are the findings of the NTP and D & # 39 a group of external scientific experts who reviewed the studies in March published in February.
"We believe that the link between radio radiation and tumors in male rats is real, and external experts in have agreed, "said Bucher.
The lowest level of exposure used in studies was equal to According to reports, maximum local tissue exposure is currently allowed for cell phone users and this level of power is rarely used later.
In addition, the highest level of exposure in studies was four times the maximum power level allowed,
NTP studies have lasted more than 10 years and is the most complete evaluation, to date, of the health effects of animals exposed to RFR with modulations used in 2 G and 3G Cell Phones
2G and 3G networks were standard at the time of study design and are still used for phone calls and texting. These studies do not study the types of RFRs used for Wi-Fi or 5G networks.
"One of the main strengths of our studies is that we have been able to control exactly the amount of radio radiation received by animals, which is not possible when studying cell phone use human, which is often based on questionnaires, "said Michael Wyde, chief toxicologist of studies.
On the other hand, the researchers noted the unexpected discovery of a longer life span in exposed male rats. "This can be explained by an observed decrease in chronic kidney problems that are often the cause of death in older rats," Wyde said.
The animals were housed in rooms specially designed and built for these studies. RF exposure started in the uterus in rats and at the age of five to six weeks in mice, and continued until two years, or almost all their useful life.
Radiation exposure was intermittent, followed by 10 minutes to 10 minutes. , totaling about nine hours a day. RFR levels ranged from 1.5 to 6 watts per kilogram in rats and from 2.5 to 10 watts per kilogram in mice.
The NTP is constructing smaller RFR exposure chambers that will facilitate the evaluation of new telecommunications technologies in a matter of weeks or months. years.
These studies will focus on the development of measurable physical indicators of the potential effects of RFR, including changes in parameters such as damage to DNA in exposed tissues.
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