I was watching this show called dark tourist on Netflix and in their Japan episode they visited the Fukushima area and received readings of up to 8.4 mcSv/h. My question is firstly what do the units even mean, and secondly how dangerous are these levels of radiation?
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The very best chart explaining radiation doses was created by xkcd.
[http://imgs.xkcd.com/blag/radiation.png](http://imgs.xkcd.com/blag/radiation.png)
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