A fast neutron fluence monitor method based on 103Rh (n, n')103Rhm reaction

Da LI; Da CHEN; Xinbiao JIANG; Tietao QI; Qingyu YU; Xiaoren YU; Jihong ZHANG; Wenshou ZHANG

doi:10.11889/j.0253-3219.2017.hjs.40.010203

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A fast neutron fluence monitor method based on ¹⁰³Rh (n, n')¹⁰³Rh^m reaction

RAY AND APPLICATIONS | 更新时间：2021-05-19

- A fast neutron fluence monitor method based on ¹⁰³Rh (n, n')¹⁰³Rh^m reaction
- NUCLEAR TECHNIQUES Vol. 40, Issue 1, Article number: 010203(2017)
- 作者机构：
  
  1.西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室西安 710024
  2.南京航空航天大学核科学与工程系南京 210016
- 作者简介：
- 基金信息：
  
  Supported by National Natural Science Foundation of China Youth Science Foundation Project;Research Foundation of the State Key Laboratory of Strong Pulse Radiation Environment Simulation and Effect
- DOI：10.11889/j.0253-3219.2017.hjs.40.010203
  CLC： TL375.4
- Received：27 July 2016，
  
  Revised：20 November 2016，
  
  Published：2017-01
- 稿件说明：
移动端阅览
Da LI, Da CHEN, Xinbiao JIANG, et al. A fast neutron fluence monitor method based on ¹⁰³Rh (n, n')¹⁰³Rh^m reaction[J]. Nuclear techniques, 2017, 40(1): 010203
DOI：

Da LI, Da CHEN, Xinbiao JIANG, et al. A fast neutron fluence monitor method based on ¹⁰³Rh (n, n')¹⁰³Rh^m reaction[J]. Nuclear techniques, 2017, 40(1): 010203 DOI： 10.11889/j.0253-3219.2017.hjs.40.010203.

摘要

给出了一种基于

103

Rh（n，n'）

103

反应监测快中子注量的方法。根据干扰核素半衰期不同的特点，选取合适的冷却和测量时间，降低了

103

Rh（n，n'）

103

活化率测量中干扰核素的影响。根据

152

Eu标定实验结果，利用遗传算法优化探测器尺寸，建立探测器蒙特卡罗算法模型。利用模型校正

Mo-

放射源实验效率，解决了探测器效率标定和射线自吸收问题。开展了快中子注量监测，实验结果与铁、硫、镍等快中子监测箔一致性较好，测量不确定度约为13.1%。

Abstract

Background:

Accurate neutron energy spectra and neutron flux parameters are needed to provide the neutron beam service for the reactor users.

Purpose:

The aim is to accurately measure the fast neutron fluence in Xi'an pulsed reactor.

Methods:

A neutron fluence monitor method based on

103

Rh (n

n')

103

reaction was presented. According to the difference of half-life of interference nuclides

cool-down time and measuring time are properly selected to reduce impacts of interference nuclides during the

103

Rh (n

n')

103

activation rate measurements. On the basis of

152

Eu calibration experiment results

the Monte Carlo model of detector was established with optimized detector size by genetic algorithm

the problem of detector efficiency calibration and ray self-absorption was solved.

Results:

A fast neutron fluence monitor experiment based on this method has been performed

the result of which was consistent with Fe

and Ni. The uncertainty of measurement is 13.1%.

Conclusion:

The establishment of this method successfully solved the problem of fast neutron fluence monitoring in Xi'an pulsed reactor.

关键词

Keywords

references

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