More importantly, these rodents are exposed to cell phone radiation-radio-frequency radiation, longer than human exposure to mobile phone radiation. John Buhe (John Bucher), a senior scientist at the National Toxicology Project (NTP) and co-author of the study, said: "these mice are exposed to cell phone radiation all over the body, which is unlikely to occur in humans. On the contrary, when people talk on their phones, only part of their bodies are exposed to radiation. "
Finally, the study examined the RF emissions of 2G and 3G mobile phones. The radiation was met in the initial test, but the radiation exceeded the test after a period of time. Researchers say the latest findings question the long-standing hypothesis that mobile phone RF radiation can cause health problems. Buhe and colleagues plan to further investigate the issue.
What did the latest research discover?
The cost of the study is about $30 million and it takes more than 10 years to complete. The researchers said the study was the most comprehensive health analysis of exposed animals exposed to 2G and 3G cell phones.
In this study, mice were placed in a special laboratory where researchers could control the amount of radiation they received. On average, the experimental mice were exposed to radiation for 9 hours, one cycle every 10 minutes. Radiation affects the uterus or early embryos, and the radiation effect lasts for two years, which occupies most of the mouse's life.
In the United States, the minimum radiation level specified is equivalent to the highest radiation of a cell phone. But the researchers stressed that ordinary mobile phone users rarely suffer from this level of radiation. The highest radiation used in the study is four times the body's maximum exposure to radiation. The researchers found "obvious evidence" of the association between the development of malignant schwannomas (a type of cardiac tumor) and radiofrequency radiation in male mice.
At the same time, the study also found some evidence that exposure to high doses of radiation is closely related to brain tumor development in a small number of male mice. Unexpectedly, the study found that male mice exposed to cell phone radiation lived longer than male mice that were not exposed to cell phone radiation, probably because male mice exposed to cell phone radiation were less likely to develop chronic kidney disease. Chronic kidney disease is the leading cause of death in aging mice.
The conclusion of the study does not apply to humans
Dr. Jeffrey Schune, director of the Food and Drug Administration's Center for Radiological Hygiene and equipment, said in a statement that animal research like this would help to discuss the topic. But we have to keep in mind that this study is not intended to test the safety of mobile phones in humans, so we can't draw a conclusion about the risks of using mobile phones.
At the same time, the statement also stated that the study did not find evidence of a true “dose response”, which means that there is no clear relationship between the dose of radiation received by the animal and the incidence of cancer. Overall, all available scientific evidence does not support the adverse effects on human health under current RF energy exposure limits.
Currently, the National Toxicology Program of the United States plans to study the effects of the latest technologies, which will use different methods and will be completed in weeks to months rather than years. In addition, these studies have attempted to identify biomarkers that may predict the early effects of rodent exposure to radiofrequency radiation, such as changes in heart rate or molecular changes that may predict cancer. If scientists can better understand animal biology changes, they will learn more about how to find the root cause of human disease.