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    Thermal luminescence dating

    Sample discs are mounted on a wheel and the readers are programmed to run heating and irradiation sequences.The TL is measured using a sensitive detector called a photomultiplier tube.Prior to the final depositional episode it is necessary that any previously acquired TL is removed by exposure to sunlight.After burial the TL begins to build up again at a rate dependent upon the radiation flux delivered by long-lived isotopes of uranium, thorium and potassium.These crystalline solids are constantly subjected to ionizing radiation from their environment, which causes some energized electrons to become trapped in defects in the molecular crystal structure.An input of energy, such as heat, is required to free these trapped electrons.

    If the specimen’s sensitivity to ionizing radiation is known, as is the annual influx of radiation experienced by the specimen, the released thermoluminescence can be translated into a specific amount of time since the formation of the crystal structure.TL Age = Palaeodose (P) _____________ (ARD) TL samples may be collected in open ended or opaque PVC tubes approximately 12cm in length and 6cm in diameter.Whilst it advisable to protect the sample from direct sunlight there is no need to sample at night and the orientation of the specimen is not important.Thermoluminescence Dating Thermoluminescence can be used to date materials containing crystalline minerals to a specific heating event.This is useful for ceramics, as it determines the date of firing, as well as for lava, or even sediments that were exposed to substantial sunlight.

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