Independent researcher Ian Goddard (see website here) has carried out a survey of published research on the potential health effects of rates of radiation exposure that the Japanese government has declared safe (up to 20 mSv per year). While few in Japan have been exposed to this level to this point, officials are on record saying that 20 mSv areas are safe for habitation. In addition, there are those in the Japanese scientific establishment who have argued that zones up to 100 mSv per year should be deemed safe. Currently evacuated towns closest to Fukushima Daiichi are likely to see radiation levels at or in excess of the 20 mSv exposure level for a decade or more. If the Japanese government holds to its current policies and interpretations, it is possible that evacuees, including children who are particularly vulnerable to the effects of radiation, may be moved back to “safe” 20 mSv areas. In a video presentation on his website (PDF summary courtesy of Satoko Norimatsu of Peace Philosophy Centre here) Goddard argues that accepting 20 mSv as safe could lead to a public health disaster.