Radioactive Decay

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7 Terms

1
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What is the activity of a radioactive source?

The number of atoms that decay per second.

2
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What is half-life?

Half-life is the time it takes for the activity/number of undecayed nuclei in a sample of a radioactive isotope to halve.

3
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What is meant by the random nature of radioactive decay?

Which nuclei and when it will decay is determined by chance - it is unpredictable.

4
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What sort of curve does a radioactive decay plot produce?

An exponential decay curve.

5
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What is the decay constant?

The decay constant is the fixed probability of a nucleus decaying in a second.

6
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What is the unit of a decay constant?

s-1

7
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State the equation used to calculate the activity of ‘N’ nuclei

A = λN Where λ is the decay constant