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Radiation levels in Japan

Dear All

Here is a link to a site which gives details of the radiological situation in Japan


Ido not think that the radiation level in the cities is not able to cause the so called “radiation sickness”, the dose rates in the cities is higher than normal but it is not an immediate threat to life.

Most of the time in Ibaragi (120 km SW of the plant), Togichi (140 km SW of the plant), Chiba (218 km SW of the plant), Tokyo (230 km SW of the plant) the dose rate has been below 0.3 micro sievert per hour, even if the dose rate was to stay at 1 micro sievert per hour for ever then it would take about 42 days for the dose experienced by the general public to reach their UK occupational limits for one year. But going over the UK occupational limit for the general public does not condemn a person to a certain horrible death.

It would take 2 years and 100 days at that dose rate to reach the one year occupational limit (20 mSv) for a radiation worker. This is a dose which would not cause a serious short term injury or disease. The risk of getting cancer from a 20 mSv dose is 0.1 %. This is not a large chance of cancer. This is based on the assumption that a person has a 5% chance of getting cancer as a result of a 1 sievert dose.

I have checked the details for the reactor site, the radiation level close to the edge of the site is higher than normal. The dose rate close to the fence does in my view justify the evacuation of the general public.


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