Paper II: The interpretation of measurement-time-dependent single-aliquot equivalent-dose estimates using predictions from a simple empirical model

被引:12
作者
Bailey, RM [1 ]
机构
[1] Univ Oxford, Sch Geog & Environm, Oxford Luminescence Res Grp, Oxford OX1 3QJ, England
关键词
quartz; model; resetting; fluvial;
D O I
10.1016/S1350-4487(03)00079-9
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
Narrow spectrum (blue-green) laboratory partial bleaching of aliquots of natural sedimentary quartz has been shown to have a significant effect on equivalent dose (measured using a single aliquot procedure) calculated as a function of measurement time (D-e(t)). A simple model, based on empirical data, is presented in which the effects of partial bleaching on D,(t) are predicted, taking into account the influences of pre- and post-burial doses. The model is applied to the case of heterogeneous populations of partially bleached single grains with various ranges of residual doses. Modelling shows that under realistic conditions, D-e histogram plots are unable to distinguish between samples having age overestimates and those with correct ages, whereas the proposed D-e-Z plot is able to make this distinction. Furthermore, modelling shows that D-e-Z plots can identify sub-populations of grains/aliquots that show most evidence of full bleaching, which can then be used to estimate a correct mean D-e value. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:685 / 691
页数:7
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