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As radiation exposure around the Fukushima nuclear power plant reach levels of 400mSv per hour (although they've since gone down), we thought it was time to put the figures into perspective.

Radiation is all around us, all the time. But what level does it have to get to before it becomes really dangerous?

The World Nuclear Association (which represents the 'global nuclear profession') does have a guide . And while there is a touch of Smilin' Joe Fission , it is a good place to start for a useful primer.

There are different kinds of radiation - which you can read about in the WNA guide. The problems we're concerned about come from ionising radiation.

Radiation dosages are measured in sieverts - but because these are so big we're talking about millisieverts mSv (a thousandth of a sievert). Rather than being an exact unit of size (because different types of radiation have different effects) an mSv measures the effective radiation dose. According to the WNA, each mSv of radiation "produces the same biological effect".

We're exposed to radiation when we fly and when we get medical treatment - and whenever we leave the house. But the large dosages can have dramatic effects.

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