A very big report came out last month with very little fanfare. It concluded what we in nuclear science have been saying for decades that radiation doses less than about 10 rem (0.1 Sv) are no big deal. The linear no-threshold dose hypothesis (LNT) does not apply to doses less than 10 rem (0.1 Sv), which is the region encompassing background levels around the world, and is the region of most importance to nuclear energy, most medical procedures and most areas affected by accidents like Fukushima.
The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) (UNSCEAR 2012) submitted the report that, among other things, states that uncertainties at low doses are such that UNSCEAR does not recommend multiplying low doses by large numbers of individuals to estimate numbers of radiation-induced health effects within a population exposed to incremental doses at levels equivalent to or below natural background levels.
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