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Nuclear Radiation Information

Reading of environmental radioactivity level by prefecture, Time series data(Graph) (English version:


Source:  Gakuranman 12.43: “Here’s a chart showing the range of radiation levels in milli sieverts (mSv). Currently up to 400mSv per hour are being recorded in the immediate vicinity of Fukushima. Remember, although these figures may suggest that the level of radiation being recorded at Fukushima is not extremely high, the danger is constant exposure over a period of time. For this reason, people within the 20km evacuation zone are at high risk of serious harm.”

7,000-10,000mSv – Person dies from radiation poisoning. (Full body exposure).
1,000mSv – Nausea and vomiting (Full body exposure).
500mSv – Decrease of lymphocytes in peripheral blood (white blood cells that defend your body) (Full body exposure).
200mSv – No clinical conditions confirmed below this number
10mSv – 1 year’s worth of natural radiation (Brazil)
6.9mSv – CT scan
2.4mSv – 1 year’s worth of natural radiation (world average)
1mSv – Limit of one’s year’s exposure to non-natural radiation (excluding medical examinations)
0.6mSv – Stomach X-ray
0.2mSv – A return air trip from Tokyo to New York
0.05mSv – Chest X-ray (or the level of radiation expected around a nuclear power plant – in practice it is much lower than this)

Click here to read the rest of Gakuranman’s post! Follow him on twitter via @gakuranman


Radiation Detection

General Information on Radiation


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