| Autor: |
Martina Demuro, M. Navazo Ruiz, Lee J. Arnold |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Radiation Measurements. 47:652-658 |
| ISSN: |
1350-4487 |
| DOI: |
10.1016/j.radmeas.2012.02.005 |
| Popis: |
In this study we assess the signatures of multi-grain averaging effects for a series of sedimentary samples taken from the archaeological site of Hotel California, Atapuerca, Spain. We focus on the special case of equivalent dose (D e) measurements made on single-grain discs that contain more than one quartz grain in each of the individual grain-hole positions with the aims of (i) providing insight into the nature and extent of averaging effects in very small multi-grain aliquots of sedimentary quartz, and (ii) assessing the suitability of 'pseudo' single-grain D e measurements for this particular dating application. Pseudo single-grain OSL measurements made on standard discs loaded with 90-100 μm grains (equivalent to ∼30 grains per hole) yield significantly different D e distribution characteristics and finite mixture model (FMM) burial dose estimates compared with single-grain OSL measurements. Grains with aberrant luminescence behaviours, which are routinely rejected during single-grain analysis, exert strong averaging effects on the pseudo single-grain and multi-grain aliquot D e distributions. Grain-hole averaging effects arising from pseudo single-grain measurements also give rise to 'phantom' dose components and are apt to provide bias assessments of quartz signal characteristics and grain type classifications. Though this is a site-specific study, it serves as a cautionary note for interpretations of other pseudo single-grain OSL and D e datasets - particularly those obtained from measurements of discs containing several tens of grains per hole and those derived from complex depositional environments. The use of custom single-grain discs drilled with smaller sized grain holes is recommended as a means of limiting grain-hole averaging effects when dealing with very fine ( |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect