UK atmospheric nuclear weapons tests
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چکیده
Exposure to radiation in all its forms is part of being alive. Ionising radiation is taken to mean radiation of high-enough energy to displace electrons from atoms and includes cosmic rays, gamma rays, X-rays, alpha and beta radiation. The average level of exposure to natural background radiation varies throughout the world dependent mainly on the geology of the underlying earth. In the UK it is about 2.2 mSv (millisieverts) per annum average. There is, however, a range and it is much higher in areas of igneous rock such as occur in Scotland. The Health Protection Agency’s latest survey (p19, Watson et al, HPA-RPD-001, 2005) specifies that the range in the annual average background UK dose is between 1 and 100 mSv, although doses in UK homes with the highest radon levels can reach a few hundred mSv.
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