A hybrid method to compute accurate efficiencies for volume samples in γ-ray spectrometry

被引：11
|
作者：
García-Talavera, M [1 ]
Peña, V [1 ]
机构：
[1] Univ Valladolid, LIBRA, Ctr I&D, E-47011 Valladolid, Spain
来源：
APPLIED RADIATION AND ISOTOPES | 2004年 / 60卷 / 2-4期
关键词：
gamma-ray spectrometry; Monte Carlo; efficiency; self-absorption;
D O I：
10.1016/j.apradiso.2003.11.022
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
In recent years, Monte Carlo (MC) methods have been increasingly applied to cope with variability in photopeak efficiencies due to matrix effects. But to obtain proper results only by numerical simulation, especially at low energies, sample bulk density and chemical composition must be well characterized. In this paper, we propose a method that combines both experimental measurements and MC simulations, being applicable to matrices of unknown composition. A transmission measurement of a Pb-210 point source through the sample allows one to compute accurately its photopeak efficiencies at energies above 46.5 keV. The method is validated for several inorganic and organic matrices measured in Petri dishes geometry. (C) 2003 Elsevier Ltd. All rights reserved.
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页码：227 / 232
页数：6
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