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17-Mar-2018 02:48

During this time, they were exposed to sunlight, which wipes out any previously stored energy from radiation. Geologists collect samples of crystals from sediment, being careful to keep them away from sunlight.

In a laboratory, heat or light is shone on the crystals, and this causes the stored radiation to be given off as light (in a process called luminescence).

When heat is shone on the sample, the dating method is called thermoluminescence.The method that shines laser light is called optically stimulated luminescence (OSL).