Measurement of absolute neutron flux by Eu activation transition method

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Measurement of absolute neutron flux by Eu activation transition method

更新时间：2021-03-12

- Measurement of absolute neutron flux by Eu activation transition method
- NUCLEAR TECHNIQUES Issue 7, (2000)
- 作者机构：
  
  中国原子能科学研究院,北京,102413
- 作者简介：
- 基金信息：
- DOI：
  CLC： TL375.4
- Published：01 July 2000
- 稿件说明：
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[1]李义国,史永谦.Eu活化过渡法测量绝对热中子注量率[J].核技术,2000(07):479-482.

Measurement of absolute neutron flux by Eu activation transition method[J]. Nuclear techniques, 2000, (7): 479-482.
[1]李义国,史永谦.Eu活化过渡法测量绝对热中子注量率[J].核技术,2000(07):479-482. DOI：

Measurement of absolute neutron flux by Eu activation transition method[J]. Nuclear techniques, 2000, (7): 479-482. DOI：

摘要

在相同条件下，以不同时间辐照Au箔和Eu箔，用γ谱仪测量

198

Au的411keVγ峰面积和

152

Eu的411keVγ峰面积，再通过4πβ－γ符合装置测得金箔的绝对中子注量率，根据两者的峰面积之比和测得的Au箔绝对中子注量率，求得

152

Eu的411keVγ峰面积对应的中子注量率。在待测中子场中，照射Au箔，利用γ谱仪测量其411keVγ峰面积和刻度过的

152

Eu的411keVγ峰面积，根据两者之比和在已知中子场中求得的

152

Eu的411keVγ峰面积对应的中子注量率，确定了待测中子场的中子注量率。该方法避免了不同γ谱仪对能量响应、探测效率和几何条件不同带来的误差。其测量结果与其它方法测量结果一致。

Abstract

A method for thermal neutron flux measurement by γ spectrometer is introduced. The 411keV γ ray peak areas for both Au and Eu foils irradiated in a reference field were first measured by a γ-spectrometer. And the absolute neutron flux for the Au foil was determined by a 4πβ-γ counter Then the neutron flux corresponding to

152

Eu can be derived from the 152Eu to

198

Au peak area ratio and the above-mentioned absolute neutron flux for Au. For an unknown field

the 411keV peak area of an irradiated Au foil in the field was measured by another γ-spectrometer

which also measured the peak area of the 411keV γ rays from the

152

Eu foil irradiated in the reference field. Based on the ratio of these two peak areas and the aforsaid neutron flux for Eu in the reference field

the absolute neutron fiux of the unknown field could be determined.

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