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If the centre with the hole is a luminescence center (radiative recombination centre) emission of light will occur.
The photons are detected using a photomultiplier tube.
Most commonly these are so-called coarse grains of 100-200 μm or fine grains of 4-11 μm. The difference between radiocarbon dating and OSL is that the former is used to date organic materials, while the latter is used to date minerals.TL dating is a matter of comparing the energy stored in a crystal to what "ought" to be there, thereby coming up with a date-of-last-heated.