There is no safe dose of radiation since radiation is cumulative. Harm in the form of excess human cancer occurs at all doses of ionizing radiation, down to the lowest conceivable dose and dose rate.
Ionizing radiation may well be the most important single cause of cancer, birth defects, and genetic disorders... The stakes for human health are very, very high in radiation matters. It is essential that people take no chance that conflict-of-interest is producing radiation databases which...cannot be trusted.
By any reasonable standard of proof, the combination of human epidemiology and track-analysis demonstrates that there is no threshold dose or dose-rate below which "repair" invariably prevents health harm.
Plutonium is so hazardous that if you had a fully developed nuclear economy with breeder reactors fueled with plutonium, and you managed to contain the plutonium 99.99 percent perfectly, it would still cause somewhere between 140,000 and 500,000 extra lung-cancer fatalities each year.
My estimate is that about 94,000 cancer fatalities for the future are being induced with each year of medical diagnostic X-rays (in US).
In truth, Edward Teller ran the Livermore Lab, but for public purposes he liked it better to be known as only an associate director
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