(Posted by Mia)
UNSCEAR and the Japanese Government announced recently up to 20mSv/y for a long term period is safe after admitting decontamination work can't reduce the amount of radiation in the atmosphere. The Japanese Government not only raised the threshold of radiation dose in the atmosphere, but also in food, water, debris, manure, sewage. Also Tepco workers' threshold was raised since the Fukushima Disaster from 100mSv to 250mSv per 5 years. The human body can't suddenly adjust to deal with such an amount of ionizing radiation.
In Chernobyl, nobody has to live in areas where the radiation level is more than 5mSv/y unless they want to. In Japan, the government applies the ICRP model for emergency situations as a normal one, and treats 20mSv/y areas as safe places to live so they do not have to evacuate people from such areas. We shouldn’t allow this false sense of security to remain unchallenged, otherwise it could be foisted on the rest of the world as well.
Although ICRP doesn't consider internal exposure to ionizing radiation, 1mSv/y by the ICRP standard has been considered as an international standard for citizens that was based on the data of Hiroshima/Nagasaki nuclear bombs victims. http://hps.org/publicinformation/ate/q8900.html
Radiological Limits give radiation limits for workers, apprentices and students, and members of the public. The values given are recommended by international organisations such as Euratom, ICRP, and IAEA and the national German authorities. A typical radiological limit for radiation workers is 20 mSv/y (20 milli Sieverts per year). For members of the public, the radiological limit is much lower at 1 mSv/y.
IAEA Safety Glossary, Terminology Used in Nuclear Safety and Radiation Protection 2007 Edition.
ICRP 103 with Glossary, 2007
COUNCIL DIRECTIVE 96/29/EURATOM of 13 May 1996 laying down basic safety standards for the protection of the health of workers and the general public against the dangers arising from ionizing radiation
Dose limits for members of public:
Euratom ICRP IAEA Germany Japan
1mSv/y 1mSv/y 1mSv/y 1mSv/y 1mSv/y