Can you tell when an individual nucleus will decay?

No, the process is random so there is no way to predict it. 

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What are the two definitions for the 'half-life' of a radioactive sample?

  1. The time taken for the activity to halve.


  1. The time taken for the number of radioactive nuclei in a sample to halve.

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How do you find the half life from an activity-time graph?

Find the time it takes for activity to fall by half. 

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What device is used to record radioactive decays?

Geiger-Muller tube and counter.

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What is the 'count rate' of a radioactive sample?

The number of decays measured each second by a Geiger-Muller tube.

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