Radioactive ____ release radiation from the ____ of their atoms. This radiation can be ____, beta or gamma radiation. The decay of ____ isotopes is completely ____, no one can predict when an individual atom might ____. Whilst it isn't possible to say which individual nucleus will decay next, because there are so many ____ in a sample it is possible to calculate how many will decay over a set period of ____. We can use statistical methods to tell when half the unstable nuclei in a sample will have decayed. This is called ____. Half-life is the time it takes for ____ of the unstable nuclei in a sample to decay, alternatively it could be described as the time it takes for the ____ or count rate of the sample to halve. ____ is the number of decays recorded each second by a ____, such as the Geiger-Muller tube, it is measured in ____.

Half-life and radioactivity.

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