Locating radioactive source based on three coupled-crystals directional detector of γ rays

Zhenchao ZHANG; Guoping ZUO; Junwen TAN; Yang ZHOU; Fan ZHANG

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

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Locating radioactive source based on three coupled-crystals directional detector of γ rays

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2021-05-19

- Locating radioactive source based on three coupled-crystals directional detector of γ rays
- NUCLEAR TECHNIQUES Vol. 40, Issue 10, Article number: 100402(2017)
- 作者机构：
  
  南华大学核科学技术学院衡阳 421001
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2017.hjs.40.100402
  CLC： TL99
- Received：21 March 2017，
  
  Revised：19 May 2017，
  
  Published：2017-10
- 稿件说明：
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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：

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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