the us national toxicology program carried out a high profile long term study on potential health hazards linked to mobile phone radiation. scientists there exposed thousands of rats and mice to radiation 9 hours a day for 2 years. the doses of radiation were acquital inch to what you would be exposed to if you were on the phone continually over that time. and the animals whole bodies were exposed not just their head or even. the findings of the study are summed up in a 260 page report among the most important results is the observation that the male rats exposed to radio frequency radiation showed more malignant brain tumors than control animals. the researchers also noted an increase in cardiac schwannoma a kind of hard tumor. this was followed soon after a by another study from scientists at the ramat seanie institute in italy. here scientists exposed more than 2000 rats to radiation the levels were much lower than those used in the us study the dose was the equivalent to constantly standing around 50 meters from a mobile phone mast. the animals were exposed for around 1000 hours a day