The Health Physics Society, the scientific society that includes radiation protection scientists, recently put out a revised position statement on Radiation Risk In Perspective. In it, they advise against estimating health risks to people from exposures to ionizing radiation that are anywhere near natural background levels because statistical uncertainties at these low levels are great. In other words, any health effects resulting from radiation levels below 10,000 mrem/yr (100 mSv/yr) are in the noise. It’s why the thousands of cancers and deaths predicted for Chernobyl and Fukushima never appeared, although the fear certainly did.
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