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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).
Therefore, it is recommended to report the GPS coordinates of the sampling point.
The application of the method to fossil teeth requires the collection of a number of data related to the geological environment of the sample (e.g., site type, sedimentary context, accurate location in the stratigraphic sequence, homogeneity of the sediments, etc.), in addition to those from the sample itself.
In order to guide non-dating specialists aiming to sample teeth for ESR dating purposes, we present hither a short paper with some basic guidelines for field work, along with a sampling form to record field data necessary for an optimal implementation of the ESR dating method.
This would indeed precludes an accurate reconstruction of the dose rate, as it is by definition based on the data collected from the present-day conditions; – if possible, the sample must be collected with its embedding sediment, from which U, Th and K contents will be measured in order to evaluate the beta dose rate received by the tooth.
If not, sediment has to be collected as closely as possible to the sample position (especially in case of teeth selected from collections).
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).
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.
U), l’application des méthodes paléodosimétriques (OSL, TL, ESR) requiert l’acquisition de données provenant non seulement de l’échantillon, mais également de son environnement proche.
Pour la datation par Résonance de Spin Électronique (ESR) d’émail dentaire, les données relatives à l’échantillon et à son contexte sédimentaire sont indispensables à la reconstruction des débits de dose associés.
The sediment sample must be wrapped in a plastic bag and sealed with tape to avoid a dry out in order to ensure a correct evaluation of its water content (in weight %); measurement of radioactivity and to derive the external gamma dose rate.
If not, the gamma dose can be evaluated from radioelement contents of the sediment collected as indicated above.