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Second Interlaboratory-Comparison Project on ESR Dating.
Appl. Radiat. Isot. 44, 119-129 (1993)
During the TL- and ESR-Conference in Clemont-Ferrand in 1990 we initiated a second “Intercomparison project on ESR dating” in which 14 ESR groups participated. Each group was provided with two samples of a coral powder, one of which (Sample A) was a fossil coral with a mass spectrometric determined U/Th age. Sample B was a recent coral, irradiated with a definite γ-dose (checked by alanine dosimetry). In both cases the AD had to be determined (for sample A the U-content and age as well). Additionally, the chance of a calibration of γ-sources by alanine dosimeters was offered (GSF). The results show that (i) the γ-source calibration is better than ±5%, (ii) the mean value of the AD from sample A seems to agree with the expected AD but the mean AD value from sample B is overestimated, (iii) systematic errors occur due to the fitting procedure: the AD estimate depends on the maximum γ-dose used for the irradiation curve, (iv) the AD determination including the smallest systematic error gives correct values for sample B but too low values for sample A which may be caused by fading of the signal g = 2.0006.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Intercomparison; ESR-dating; γ-source; calibration; AD-determination; fading; corals
ISSN (print) / ISBN
0969-8043
e-ISSN
1872-9800
Zeitschrift
Applied Radiation and Isotopes
Quellenangaben
Band: 44,
Heft: 1-2,
Seiten: 119-129
Verlag
Elsevier
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Radiation Protection (ISS)