Constraints on the precision of SAR in equivalent dose estimations close to saturation in quartz |
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Authors: | Constantin Athanassas |
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Institution: | 1.Laboratory of Archaeometry,Institute of Materials Science, N.C.S.R. ‘Demokritos’,Athens,Greece |
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Abstract: | Difficulties in evaluating accurate equivalent doses for Late Quaternary sediments from the south coasts of Greece arose in
the course of SAR measurements. Large scatter among apparent equivalent doses perplexed the evaluation of accurate mean estimates
in circumstances where very large doses were involved. Besides, dose recovery experiments revealed that when intersection
of the natural signal occurs onto the saturating segment of the growth curve, a distinct relationship between De and growth curve shape occurs. At very low slope angles, SAR tends to overestimate the recovered dose. The mechanism which
controls the spread in equivalent dose estimation is investigated. |
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