The unfolding of NaI(Tl) γ-ray spectrum based on maximum likelihood method

ZHANG Qingxian GE Liangquan GU Yi ZENG Guoqiang LIN Yanchang WANG Guangxi

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The unfolding of NaI(Tl) γ-ray spectrum based on maximum likelihood method

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- The unfolding of NaI(Tl) γ-ray spectrum based on maximum likelihood method
- NUCLEAR TECHNIQUES Vol. 34, Issue 8, (2011)
- 作者机构：
  
  成都理工大学
- 作者简介：
- 基金信息：
  
  国家自然科学基金核地球物理学天然伽玛场的研究(40774063);863项目航空伽玛能谱勘察系统研发(2006AA06A207)资助
- DOI：
  CLC： TL812
- Published：01 August 2011
- 稿件说明：
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[1]张庆贤,葛良全,谷懿,曾国强,林延畅,王广西.基于极大似然估计的NaI(Tl)晶体仪器谱解析方法研究[J].核技术,2011,34(08):569-574.

ZHANG Qingxian GE Liangquan GU Yi ZENG Guoqiang LIN Yanchang WANG Guangxi. The unfolding of NaI(Tl) γ-ray spectrum based on maximum likelihood method[J]. Nuclear techniques, 2011, 34(8): 569-574.
[1]张庆贤,葛良全,谷懿,曾国强,林延畅,王广西.基于极大似然估计的NaI(Tl)晶体仪器谱解析方法研究[J].核技术,2011,34(08):569-574. DOI：

ZHANG Qingxian GE Liangquan GU Yi ZENG Guoqiang LIN Yanchang WANG Guangxi. The unfolding of NaI(Tl) γ-ray spectrum based on maximum likelihood method[J]. Nuclear techniques, 2011, 34(8): 569-574. DOI：

摘要

若能量分辨率不足、对核素的识别能力较差

就需解析仪器谱。本文采用极大似然估计法

对NaI（Tl）探测的仪器谱进行解析。通过对合成谱线的解析

结果表明

该方法可以有效地分解能量差2/3 FHWM重叠峰。将该方法应用到野外γ能谱仪的标定中

在混合模型上的检验结果表明

采用极大似然估计法进行能谱解析

建立含量和净峰面积之间的正比关系

可有效提高野外γ能谱仪对U、Th、K测量精度。

Abstract

NaI(Tl) detectors

having a good detection efficiency

are used to detect gamma rays in field surveys.But the poor energy resolution hinders their applications

despite the use of traditional methods to resolve the overlapped gamma-ray peaks.In this paper

the maximum likelihood(ML) solution is used to resolve the spectrum.The ML method

which is capable of decomposing the peaks in energy difference of over 2/3 FWHM

is applied to scale NaI(Tl) the spectrometer.The result shows that the net area is in proportion to the content of isotopes and the precision of scaling is better than the stripping ration method.

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