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Other parameters such as the altitude above sea level and latitude may also affect the intensity of the cosmic rays (see Prescott & Hutton, 1994).

luminescence and esr dating-89luminescence and esr dating-56luminescence and esr dating-19luminescence and esr dating-15

If the enamel layer is in direct contact with the sediment on one side, then the beta dose rate has to be calculated from a sediment sample, from which radioactive element contents (U, Th and K) are measured.

K (from the surrounding sediment), as well as cosmic rays damage the hydroxyapatite structure of the tooth enamel (fig. From a physical point of view, it can be expressed by the accumulation of unpaired electrons in defects of the crystalline structure (called “traps”) as a function of the absorbed dose of ionizing radiations (alpha, beta, gamma and cosmic) and the exposition time.

is measured using ESR spectroscopy, by studying the growth of the ESR signal of the enamel sample as a function of the absorbed radiation dose.

Consequently, we advise that the tooth should be collected with at least 150 g of its embedding sediment. It can be done either by inserting TL or OSL dosimeters, which will record the gamma dose rate for at least several months, and/or using a portable gamma spectrometer, which can provide rapid dose rate measurements (in 10 to 30 min).

Both kinds of measurements should be done at a 30 cm horizontal depth within the targeted stratigraphical unit, in order to make sure that only the radioactivity of the sediment is recorded.




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