In this learning episode, from the Institute of Physics, students use discussion, demonstration and worked examples to look at the exponential decay and radioactive half-life of a range of nuclides. These include sources of alpha, beta and gamma radiation.

The activities in this learning episode include:
* discussing and demonstrating half-life
* measuring the half-life of protactinium [sup]234[/sup]Pa
* worked examples on whole numbers of half lives
* student examples and calculations

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