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12 cards from this deck
Low-level radiation that exists around us all the time
Natural sources and man-made sources
Radon gas (50%)
Uranium decay in rocks
Alpha particles
Cornwall
Granite rocks
Sieverts (Sv)
100010001000 mSv
0.0030.0030.003 mSv per hour
100100100 mSv (0.10.10.1 Sv)
10%
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