Preliminary study of sample uniformity impact on the elemental analysis in PGNAA technique

HEI Daqian; CHENG Can; JIA Wenbao; SHAN Qing; LING Yongsheng

doi:10.11889/j.0253-3219.2014.hjs.37.060202

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Preliminary study of sample uniformity impact on the elemental analysis in PGNAA technique

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- Preliminary study of sample uniformity impact on the elemental analysis in PGNAA technique
- NUCLEAR TECHNIQUES Vol. 37, Issue 6, Article number: 060202(2014)
- 作者机构：
  
  南京航空航天大学材料科学与技术学院,南京,210016
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2014.hjs.37.060202
  CLC：
- Published：04 June 2014
- 稿件说明：
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HEI Daqian, CHENG Can, JIA Wenbao, et al. Preliminary study of sample uniformity impact on the elemental analysis in PGNAA technique[J]. Nuclear techniques, 2014, 37(6): 060202
DOI：

HEI Daqian, CHENG Can, JIA Wenbao, et al. Preliminary study of sample uniformity impact on the elemental analysis in PGNAA technique[J]. Nuclear techniques, 2014, 37(6): 060202 DOI： 10.11889/j.0253-3219.2014.hjs.37.060202.

摘要

采用蒙特卡罗模拟技术，从样品自吸收和中子场在样品中分布特性两个角度，对中子活化瞬发γ射线分析(Prompt Gamma-ray Neutron Activition Analysis

PGNAA)技术中γ射线能谱受样品均匀性的影响进行了初步研究。结果表明，因样品均匀性不同引起的样品自吸收及中子场分布的变化，对γ射线能谱有一定的影响。由于样品均匀性的变化，部分元素特征峰计数变化可达20%以上，从而在一定程度上影响了元素成分分析的准确度。

Abstract

Background: In the adoption of Prompt Gamma-ray Neutron Activation Analysis (PGNAA) technique

the composition of samples is always assumed to be uniform

while it is nonuniform in fact

which would affect the analysis result. Purpose: The influence of the sample’s uniformity to PGNAA has been discussed. Methods: Samples of the same composition and average density

but different uniformity have been simulated with Monte Carlo method. And the preliminary analysis has been discussed in the aspects of self-absorption and the neutron field distribution of the samples. Results: The results show that the change of sample uniformity has a certain effect on the gamma-rays spectrum. The difference of the element characteristic peak counting rate

which is caused by the change of samples’ uniformity

is even higher than 20% for some elements. Conclusion: In the PGNAA technique

the uniformity of samples has to be considered to ensure the element analysis accuracy. Abstract

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Gamma ray self-absorption correction for cylindrical volume-sources

Related Author

Yu Caiqin Li Guozhen Bian Hongxia Xu Xunjiang

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卞虹霞

许浔江

Related Institution

Shanghai Institute of Nuclear Research, Academia Sinica

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