Thermal luminescence dating

This is because water attenuates (scatters) the radiation, reducing the total radiation dose that the sample has been exposed to. In addition to radiation from the surrounding sediment, OSL samples are affected by a cosmic dose rate, which reduces as the amount of sediment the sample is buried under increases.

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Other important factors that need to be considered when calculating the radiation dose rate are the water content of the sediment and how much sediment is on top of the sample site. From this curve we can calculate the dose that our sample must have received to produce the amount of light that we measured first. We call this measurement our “equivalent dose”, because it is equivalent to the dose that the sample received in nature. The gamma spectrometer has been put into the sample hole (see the lead going from the gamma spectrometer crystal to the control box).