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10 cards from this deck
Very low penetration, very high ionising power
Approximately 2 mm of aluminium
5 cm lead or 1 m concrete (97% absorption)
20
Absorbed dose unit: 1 Gy=1 J⋅kg−11 \text{ Gy} = 1 \text{ J} \cdot \text{kg}^{-1}1 Gy=1 J⋅kg−1
Biological effect of ionising radiation (dose equivalent)
Greater than 8.0 Sv
1 mSv per year
20 mSv per year (averaged over 5 years)
8 days; thyroid cancer therapy (beta & gamma emitter)
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