First experimental evaluation of the alpha efficiency in coarse-grained quartz for ESR dating purposes: implications for dose rate evaluation

被引：15

作者：

Bartz, Melanie ^{[1
]}

Arnold, Lee J. ^{[2
,3
]}

Spooner, Nigel A. ^{[2
,3
,4
]}

Demuro, Martina ^{[2
,3
]}

Campana, Isidoro ^{[5
]}

Rixhon, Gilles ^{[6
]}

Brueckner, Helmut ^{[1
]}

Duval, Mathieu ^{[5
,7
]}

机构：

[1] Univ Cologne, Inst Geog, Albertus Magnus Pl, D-50923 Cologne, Germany

[2] Univ Adelaide, Sch Phys Sci, Environm Inst, North Terrace Campus, Adelaide, SA 5005, Australia

[3] Univ Adelaide, IPAS, North Terrace Campus, Adelaide, SA 5005, Australia

[4] Def Sci & Technol Grp, Third Ave, Edinburgh, SA 5111, Australia

[5] Ctr Nacl Invest Evoluc Humana CENIEH, Paseo Sierra Atapuerca 3, Burgos 09002, Spain

[6] Univ Strasbourg, ENGEES Lab Image Ville Environm LIVE, UMR 7362 CNRS, Quai Koch 1, F-67000 Strasbourg, France

[7] Griffith Univ, ARCHE, EFRI, 170 Kessels Rd, Nathan, Qld 4111, Australia

来源：

SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期

基金：

澳大利亚研究理事会;

关键词：

ELECTRON-SPIN-RESONANCE; LOWER MOULOUYA RIVER; MIDDLE PALEOLITHIC SITE; SEDIMENTARY QUARTZ; LAKE MUNGO; OSL; AGE; LUMINESCENCE; QUATERNARY; SIZE;

D O I：

10.1038/s41598-019-54688-9

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We present the first experimental evaluation of the alpha efficiency value for electron spin resonance (ESR) dating of coarse quartz grains, which is used for the evaluation of the internal and external alpha dose rate components. Based on our results, we recommend the use of an a-value of 0.07 +/- 0.01 (1 sigma) for both the Al and Ti centres. Although we acknowledge that quartz ESR alpha efficiency may be sample dependent, and could also be impacted by other sources of uncertainty, this potential variability is presently impossible to evaluate given the absence of other experimental a-values available in the ESR dating literature. Measured radioactivity of quartz grains from the Moulouya catchment (NE Morocco) provides an internal dose rate in the range of 50-70 mu Gy/a when using an a-value of 0.07. The use of this empirically derived a-value for the evaluation of the internal and external alpha dose rate has a limited overall impact on the final ESR age results: they change by <2% and <3%, respectively, in comparison with those obtained with an assumed a-value. However, the large variability observed among the broader sample dataset for quartz internal radioactivity and hydrofluoric acid (HF) etching rates underscores the potential importance of undertaking experimental evaluations of alpha dose rate parameters for each dated sample.

引用

页数：10