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Radiation dosage is measured in Sieverts. This replaces the old unit, the Rem. 1 Sievert = 100 Rem, which is a large unit, so we are usually talking millisieverts (mSv) = 1/1000 of a Sievert.

2 to 3 mSv/year - typical background dose in most countries

2.4 mSv/year - average dose to US nuclear industry employees

up to 5 mSv/year - typical dose for aircrew

20 mSv/year - current limit (average) for nuclear industry employees

100 mSv/year - lowest level at which there is evidence of any increase in cancer rate

350 mSv/lifetime - criterion for relocating people after Chernobyl accident

1 Sv/cumulative - Would probably cause a fatal cancer many years later in 5 out of 100 persons

1 Sv single dose in short time - causes radiation sickness such as nausea and decreased white blood cell count, but not death (ie in short term)

5 Sv single dose - Would kill about 50 percent within a month

10 Sv single dose - fatal within a few weeks

Information from http://www.world-nuclear.org/info/inf05.html

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