期刊论文

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

Zuo, G.

中文

核技术

0253-3219

2017

40

10

100402-1-100402-5

10.11889/j.0253-3219.2017.hjs.40.100402

(No.2016JJ2106)资助 Supported by Natural Science Foundation of Hunan Province (2016JJ2106):湖南省自然科学基金

本校为第一且通讯机构

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_4Ge_3O_(12), 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≥0.331 μGy·h~(–1)处,定位角度偏差≤0.99°;对于~(60)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3.7×10~7 Bq ~(137)Cs源,相对定位偏差约为5%。

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, Bi 4 Ge 3 O 12 (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 ene...