Radiation can be classified into electromagnetic or particulate. Ionising radiation is radiation that has sufficient energy associated with it to remove electrons from atoms, thus causing ionisation. This is restricted to high-energy electromagnetic radiation (x and y radiation) and charged particles (a, P-, P+). Examples of non-ionising electromagnetic radiation include light, radio, and microwaves. We will concern ourselves specifically with ionising radiation as this is of most interest in nuclear medicine and radiological imaging.
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