As part of your A-level physics practical work you are required to carry out an experiment using ionising radiation. One possible experiment involves determining the half-thickness of lead for gamma-ray absorption, and that’s what I’ll discuss here. While some of the procedures are specific to this experiment, most of the techniques are applicable to other radioactivity practicals that you might carry out.
Ionising radiation is all around us. Some comes from space and some from the rocks beneath our feet. Life on Earth has evolved subject to, and become used to, a low level of background radiation.
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