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Firstly I had to crush the samples in the workshop to shards, and then grind them down on a disc miller.

This was very noisy and dusty, and fairly hard work, but good fun.

Also, the exposure assumptions must be justified through other means, for example by taking into account clear signs of surface erosion and information consistent with (or suggestive of) 100% shielding prior the exposure event to be dated.

So-called ‘inherited’ Be from earlier exposure invalidate a single age determination, but there are ways to check for ‘prior exposure’ for example by measurement on another cosmogenic isotope, utilising the difference in half-lives.

Some cosmic ray particles reach the surface of the earth and contribute to the natural background radiation environment.