RADIOACTIVE DECAY
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Last updated 7:22 PM on 11/12/22
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17 Terms
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What is radioactive decay
unstable nuclei gives out randomly gives out radiation to become more stable
2
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What is activity
the rate at which a source of unstable nuclei decays
3
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What is activity measured in
Bq (becquerel)
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What is count rate
the number of decays recorded each second by a detector
5
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What are the 4 types of nuclear radiation
alpha, beta, gamma and neutron
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What is alpha radiation
two neutrons and two protons
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What is beta radiation
high speed electron ejected from nucleus
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What is gamma radiation
electromagnetic radiation from nucleus
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What is the ionising power of alpha
highly ionising
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What is the ionising power of beta
less ionising than alpha, more ionising than gamma
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What is the ionising power of gamma
weakly ionising
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What is the penetration power of alpha
weak penetration
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What is the penetration power of beta
more penetrating than alpha, less penetrating than beta
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What is the penetration power of gamma
strong penetration
15
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What is alpha stopped by
paper and skin
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What is beta stopped by
aluminium foil
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What is gamma stopped by
weakened by a few cms of lead
