基于三晶体耦合γ射线方向探测器的放射源定位

张振朝; 左国平; 谭军文; 周扬; 张帆

doi:10.11889/j.0253-3219.2017.hjs.40.100402

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基于三晶体耦合γ射线方向探测器的放射源定位

核电子学与仪器 | 更新时间：2021-05-19

- 基于三晶体耦合γ射线方向探测器的放射源定位
- Locating radioactive source based on three coupled-crystals directional detector of γ rays
- 核技术 2017年40卷第10期文章编号：100402
- 作者机构：
  
  南华大学核科学技术学院衡阳 421001
- 作者简介：
  
  [ "张振朝, 男, 1993年出生, 2015年毕业于云南民族大学, 现为硕士研究生, 研究领域为放射源和放射性材料的定位", "ZHANG Zhenchao, male, born in 1993, graduated from Yunnan Minzu University in 2015, master student, focusing on locating the radioactive source and radioactive materials" ]
  左国平, E-mail:409882007@qq.com ZUO Guoping, E-mail:409882007@qq.com
- 基金信息：
  
  湖南省自然科学基金(2016JJ2106)
- DOI：10.11889/j.0253-3219.2017.hjs.40.100402
  中图分类号： TL99
- 收稿日期：2017-03-21，
  
  修回日期：2017-05-19，
  
  纸质出版日期：2017-10
- 稿件说明：
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张振朝, 左国平, 谭军文, 等. 基于三晶体耦合γ射线方向探测器的放射源定位[J]. 核技术, 2017,40(10):100402

Zhenchao ZHANG, Guoping ZUO, Junwen TAN, et al. Locating radioactive source based on three coupled-crystals directional detector of γ rays[J]. Nuclear techniques, 2017, 40(10): 100402
张振朝, 左国平, 谭军文, 等. 基于三晶体耦合γ射线方向探测器的放射源定位[J]. 核技术, 2017,40(10):100402 DOI： 10.11889/j.0253-3219.2017.hjs.40.100402.

Zhenchao ZHANG, Guoping ZUO, Junwen TAN, et al. Locating radioactive source based on three coupled-crystals directional detector of γ rays[J]. Nuclear techniques, 2017, 40(10): 100402 DOI： 10.11889/j.0253-3219.2017.hjs.40.100402.

摘要

为了快速定位并寻回丢失的放射源，设计了一种由NaI、CsI、锗酸铋（Bi

，BGO）三种晶体与铅耦合组成的γ射线方向探测器，并采用基于蒙特卡罗方法的通用软件包MCNP（Monte Carlo N Particle Transport Code）研究了铅晶比例、射线能量、剂量率等因素对探测器角度分辨率的影响。结果表明，对于

137

Cs源，在空气吸收剂量率≥ 0.331μGy·h

-1

处，定位角度偏差≤ 0.99°；对于

Co源，在空气吸收剂量率0.586 μGy·h

-1

处，测量的平均角度偏差为0.46°；对于水平距离7 m、高度4 m的3.7×10

137

Cs源，相对定位偏差约为5%。

Abstract

Background

With the increase application of radioactive sources

the possibility of radiation accidents is raised as well in recent years.

Purpose

This study aims to fastly locate lost radioactive sources using a directional detector of γ rays.

Methods

Three different coupled scintillators

i.e.

NaI

CsI

(BGO)

together with center lead cylinder were employed to build the γ ray directional detection system. Localizing spatial radioactive source and the influences of angular resolution caused by lead-crystal ratio

rays energy and source dose rate were simulated by using MCNP (Monte Carlo N particle transport code).

Results

The angle deviation is less than 0.99°

provided that the air absorbed dose rate of

137

Cs source is not lower than 0.331 μGy·h

-1

. The average angle measurement deviation is 0.46° when the air absorbed dose rate of

Co source is 0.586 μGy·h

-1

. The positioning deviation of 3.7×10

137

Cs source at a distance of 7 m and height of 4 m is about 5%.

Conclusion

The three-coupled-crystals directional detector of γ rays can be used to identify the direction of incident γ rays and locate the spatial position of unknown radioactive source with reasonable radiant intensity.

关键词

Keywords

references

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