多球中子谱仪的周围剂量当量转换研究

吕宁; 过惠平; 尚爱国; 赵括; 吕汶辉; 肖琦展; 孙铭言; 杜泽群; 孟瑞; 陈俐文; 王凯; 曹智

doi:10.11889/j.0253-3219.2018.hjs.41.120403

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多球中子谱仪的周围剂量当量转换研究

核电子学与仪器 | 更新时间：2021-05-19

- 多球中子谱仪的周围剂量当量转换研究
- Research on the test, measurement and ambient dose equivalent conversion for a multisphere neutron spectrometer
- 核技术 2018年41卷第12期文章编号：120403
- 作者机构：
  
  1.火箭军工程大学西安 710025
  2.中国人民解放军92609部队北京 100077
  3.中国人民解放军96035部队通化 134000
  4.中国人民解放军96871部队宝鸡 721000
  5.中国人民解放军91515部队三亚 572000
- 作者简介：
  
  [ "吕宁, 男, 1981年出生, 2010年于西安交通大学获硕士学位, 现为博士研究生, 主要从事核辐射测量方面研究", "LYU Ning, male, born in 1981, graduated from Xi'an Jiaotong University with a master's degree in 2010, doctoral student, focusing on nuclear radiation measurement" ]
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.120403
  中图分类号： TL817
- 收稿日期：2018-09-11，
  
  修回日期：2018-10-31，
  
  纸质出版日期：2018-12-10
- 稿件说明：
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吕宁, 过惠平, 尚爱国, 等. 多球中子谱仪的周围剂量当量转换研究[J]. 核技术, 2018,41(12):120403

Ning LYU, Huiping GUO, Aiguo SHANG, et al. Research on the test, measurement and ambient dose equivalent conversion for a multisphere neutron spectrometer[J]. Nuclear techniques, 2018, 41(12): 120403
吕宁, 过惠平, 尚爱国, 等. 多球中子谱仪的周围剂量当量转换研究[J]. 核技术, 2018,41(12):120403 DOI： 10.11889/j.0253-3219.2018.hjs.41.120403.

Ning LYU, Huiping GUO, Aiguo SHANG, et al. Research on the test, measurement and ambient dose equivalent conversion for a multisphere neutron spectrometer[J]. Nuclear techniques, 2018, 41(12): 120403 DOI： 10.11889/j.0253-3219.2018.hjs.41.120403.

摘要

以辐射场全能段中子能谱获取及周围剂量当量转换为目的，针对一套以

He正比计数器为探测器的多球中子谱仪，介绍了采用脉冲幅度分析法进行中子-γ甄别，准确测量中子计数率的方法；测量并获取了实验室本底环境中子、Am-Be中子源、氘氘中子管连续出射中子三种辐射场的中子能谱，并予以分析；基于中子能谱进行周围剂量当量转换，分析了不同能量段中子所占的剂量比重，发现快中子是主要贡献者；在比较测量中，对三种单慢化体中子剂量仪器产生的误差进行了理论分析，并给出了依靠多球中子谱仪测准中子周围剂量当量的三点建议。多球中子谱仪可以直接测算周围剂量当量，可以指导其它中子剂量仪器的标校，还可以针对具体能量段进行中子防护设计，精准有效指导外照射剂量防护工作的开展。

Abstract

Background

Neutron ambient dose equivalent is closely related to neutron energy. Acquisition of the energy spectrum is necessary to calculate the ambient dose equivalent accurately in the neutron radiation field.

Purpose

This study aims at the ambient dose equivalent calculation by shakedown test of multi sphere neutron spectrometer (MNS).

Methods

First of all

pulse height analysis (PHA) method was used for neutron/γ discrimination to precisely measure neutron count rate. Then the neutron energy spectrum was successfully obtained and carefully analyzed in three neutron radiation fields:laboratory background

Am-Be neutron source and DD tube emergency neutron. Neutron fluence was converted into ambient dose equivalent consulting the conversion coefficient recommended by International Commission on Radiological Protection (ICRP) report No.74

and dose contribution weight from neutron in different energy groups was analyzed. Finally

comparison test was made against three other instruments with mono moderator respectively

errors between MNS and them were analyzed theoretically.

Results

Neutron ambient dose equivalent converted from energy spectrum measured by MNS was consistent with the other three dose instruments. No matter what kind of the neutron radiation field is

fast neutrons are the main contributors to the dose.

Conclusion

PHA and pulse height spectrum monitoring is the critical point for neutron energy spectrum measurement. MNS can be used to measure and calculate neutron ambient dose equivalent directly

guide optimal reference radiation for other neutron dose instruments calibration

and radiation protection design against neutron of special energy groups.

关键词

Keywords

references

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