Atom-Angst: Wissenschaft und Mythos
UN Science Committee finds no observable health effects from last year’s nuclear accident in Fukushima. No effects.
A very big report came out last month with very little fanfare. It concluded what we in nuclear science have been saying for decades – 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.” You know, like everyone’s been doing since Chernobyl. Like everyone’s still doing with Fukushima.
Finally, the world may come to its senses and not waste time on the things that aren’t hurting us and spend time on the things that are. And on the people that are in real need. Like the infrastructure and economic destruction wrought by the tsunami, like cleaning up the actual hot spots around Fukushima, like caring for the tens of thousands of Japanese living in fear of radiation levels so low that the fear itself is the only thing that is hurting them, like seriously preparing to restart their nuclear fleet and listening to the IAEA and the U.S. when we suggest improvements.
The advice on radiation in this report will clarify what can, and cannot, be said about low dose radiation health effects on individuals and large populations. Background doses going from 250 mrem (2.5 mSv) to 350 mrem (3.5 mSv) will not raise cancer rates or have any discernable effects on public health. Likewise, background doses going from 250 mrem (2.5 mSv) to 100 mrem (1 mSv) will not decrease cancer rates or effect any other public health issue.
Note – although most discussions are for acute doses (all at once) the same amount as a chronic dose (metered out over a longer time period like a year) is even less effecting. So 10 rem (0.1 Sv) per year, either as acute or chronic, has no effect, while 10 rem per month would.
The Japanese people can start eating their own food again, and moving back into areas only lightly contaminated with radiation levels that are similar to background in many areas of the world like Colorado and Brazil.
The economic and psychological harm wrought by the wrong-headed adoption of linear no-threshold dose effects for doses less than 0.1 Sv (10 rem) has been extremely harmful to the already stressed population of Japan, and to continue it would be criminal.
To recap LNT, the Linear No-Threshold Dose hypothesis is a supposition that all radiation is deadly and there is no dose below which harmful effects will not occur. Double the dose, double the cancers. First put forward after WWII by Hermann Muller, and adopted by the world body, including UNSCEAR, its primary use was as a Cold War bargaining chip to force cessation of nuclear weapons testing. The fear of radiation that took over the worldview was a side-effect.
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UNSCEAR also found no observable health effects from last year’s nuclear accident in Fukushima. No effects.