技术说明:关于发光测年实验室β源校准的可靠性

IF 2.7 Q2 GEOCHEMISTRY & GEOPHYSICS Geochronology Pub Date : 2021-06-23 DOI:10.5194/GCHRON-3-371-2021
B. Mauz, Loïc A. Martin, M. Discher, C. Tribolo, S. Kreutzer, Chiara Bahl, A. Lang, N. Mercier
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引用次数: 1

摘要

摘要大多数发光阅读器中使用的90Sr / 90Y β源的剂量率是实验室的关键参数。关于参数控制校准值的准确度和精度,已经有了完善的知识体系,但仍然存在一些难以解释的不一致性。在这里,我们通过实验和模拟研究了晶粒尺寸、等分尺寸和辐照几何形状对最终定标值的影响。所得数据表明,单个β源的剂量率是许多参数的相互作用的结果,其中大多数参数在以前的研究中得到了很好的确定。我们的研究为相同粒径对吸收剂量的影响提供了证据,特别是对于粒径为50-200µm的颗粒。对于这个粒径分数,吸收剂量增加了~ 10% - 20%,而粒径由于向粒径中心径向增加剂量率而减小。当50-100 μ m颗粒作为< 8 mm尺寸的等分排列时,增强效果变化最大。当大颗粒被安装成小等分时,由于反向散射电子引起的剂量减少的边缘效应,这种增强被逆转。电荷的积累决定了吸收剂量随颗粒尺寸的增加而增加,这一原理随着辐照几何形状的变化而变得更加可变。我们得出结论,未来的校准样品应由小、中、大和超大石英颗粒组成的子样品组成,每个子样品获得几个伽马剂量。然后从拟合线的反斜率而不是从单个数据点获得小、中、大等分测量的校准值。这样,就涵盖了单个β源的所有可能的辐照几何形状,并提高了校准的精度。
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Technical note: On the reliability of laboratory beta-source calibration for luminescence dating
Abstract. The dose rate of the 90Sr / 90Y beta source used in most luminescence readers is a laboratory key parameter. There is a well-established body of knowledge about parameters controlling accuracy and precision of the calibration value but some hard-to-explain inconsistencies still exist. Here, we have investigated the impact of grain size, aliquot size and irradiation geometry on the resulting calibration value through experiments and simulations. The resulting data indicate that the dose rate of an individual beta source results from the interplay of a number of parameters, most of which are well established by previous studies. Our study provides evidence for the impact of aliquot size on the absorbed dose in particular for grain sizes of 50–200 µm. For this grain-size fraction, the absorbed dose is enhanced by ∼ 10 %–20 % as aliquot size decreases due to the radial increase of dose rate towards the centre of the aliquot. The enhancement is most variable for 50–100 µm grains mounted as aliquots of < 8 mm size. The enhancement is reversed when large grains are mounted as small aliquots due to the edge effect by which the dose induced by backscattered electrons is reduced. While the build-up of charge dictates the increase of absorbed dose with the increase of grain size, this principle becomes more variable with changing irradiation geometry. We conclude that future calibration samples should consist of subsamples composed of small, medium, large and very large quartz grains, each obtaining several gamma doses. The calibration value measured with small, medium and large aliquots is then obtained from the inverse slope of the fitted line, not from a single data point. In this way, all possible irradiation geometries of an individual beta source are covered, and the precision of the calibration is improved.
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来源期刊
Geochronology
Geochronology Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
0.00%
发文量
35
审稿时长
19 weeks
期刊最新文献
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