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.
机构:
Univ Oxford, Archaeol & Hist Art Res Lab, Oxford Luminescence Res Grp, Oxford OX1 3QJ, EnglandUniv Oxford, Archaeol & Hist Art Res Lab, Oxford Luminescence Res Grp, Oxford OX1 3QJ, England
机构:
Oklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USAOklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USA
Lepper, K
;
Larsen, NA
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Oklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USAOklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USA
Larsen, NA
;
McKeever, SWS
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Oklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USAOklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USA
机构:
Univ Oxford, Archaeol & Hist Art Res Lab, Oxford Luminescence Res Grp, Oxford OX1 3QJ, EnglandUniv Oxford, Archaeol & Hist Art Res Lab, Oxford Luminescence Res Grp, Oxford OX1 3QJ, England
机构:
Oklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USAOklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USA
Lepper, K
;
Larsen, NA
论文数: 0引用数: 0
h-index: 0
机构:
Oklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USAOklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USA
Larsen, NA
;
McKeever, SWS
论文数: 0引用数: 0
h-index: 0
机构:
Oklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USAOklahoma State Univ, Dept Phys, Environm Sci Program, Stillwater, OK 74078 USA