Constraints on the precision of SAR in equivalent dose estimations close to saturation in quartz
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Laboratory of Archaeometry, Institute of Materials Science, N.C.S.R. ‘Demokritos’, Aghia Paraskevi, 153 10, Athens, Greece
Online publication date: 2011-09-22
Publication date: 2011-12-01
Geochronometria 2011;38(4):413-423
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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