基于三晶体耦合γ射线方向探测器的放射源定位

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

Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (10): 100402-100402.doi: 10.11889/j.0253-3219.2017.hjs.40.100402

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles Next Articles

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

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

School of Nuclear Science and Technology, University of South China, Hengyang 421001, China

Received:2017-03-21 Revised:2017-05-19 Online:2017-10-10 Published:2017-09-29
Supported by:
Supported by Natural Science Foundation of Hunan Province (No.2016JJ2106)

Abstract

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, Bi₄Ge₃O₁₂ (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 ¹³⁷Cs 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 ⁶⁰Co source is 0.586 μGy·h^-1. The positioning deviation of 3.7×10⁷ Bq ¹³⁷Cs 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.

Key words: γ rays, Three-coupled-crystals, MCNP5, Source locating

CLC Number:

TL99

ZHANG Zhenchao, ZUO Guoping, TAN Junwen, ZHOU Yang, ZHANG Fan. Locating radioactive source based on three coupled-crystals directional detector of γ rays[J].Nuclear Techniques, 2017, 40(10): 100402-100402.

References

1 周启甫. 我国辐射安全与保安现状及对策[C]. 2007年核技术工业应用分会学术年会, 湖北, 2007:2-9.ZHOU Qifu. The situation and countermeasure of radiation safety and security in China[C]. The Council Collected Papers of Nuclear Technology and Industry Application in 2007 Annual Conference, Hubei, 2007:2-9.
2 范深根. 我国放射事故概况与原因分析[J]. 辐射防护, 2002, 22(5):277-281. DOI:10.3321/j.issn:1000-8187. 2002.05.005.FAN Shengen. General situation of radiation accidents in China and analysis of their causes[J]. Radiation Protection, 2002, 22(5):227-281. DOI:10.3321/j.issn:1000-8187. 2002.05.005.
3 Willis M J, Skutnik S E, Hall H L. Detection and positioning of radioactive sources using a four-detector response algorithm[J]. Nuclear Instruments & Methods in Physics Research A, 2014, 767(11):445-452. DOI:10.1016/j.nima.2014.08.033.
4 Powsner R A, Powsner E R. Essential nuclear medicine physics[M]. 2nd ed. UK:Blackwell Publishing, 2008.
5 谭军文, 左国平, 周剑良, 等. NaI探测器搜寻γ源定位准直器模拟设计[J]. 核电子学与探测技术, 2015, 35(4):354-360. DOI:10.3969/j.issn.0258-0934.2015.04.010.TAN Junwen, ZUO Guoping, ZHOU Jianliang, et al. The simulation design of a positioning collimator to locate the gamma radiation source with NaI detector[J]. Nuclear Electronics & Detection Technology, 2015, 35(4):354-360. DOI:10.3969/j.issn.0258-0934.2015.04.010.
6 Gamage K A A, Joyce M J, Taylor G C. Investigation of three-dimensional localization of radioactive sources using a fast organic liquid scintillator detector[J]. Nuclear Instruments & Methods in Physics Research A, 2013, 707(7):123-126. DOI:10.1016/j.nima.2012.12.119.
7 Shirakawa Y. Development of a direction finding gamma-ray detector[J]. Nuclear Instruments & Methods in Physics Research A, 2007, 263(1):58-62. DOI:10.1016/j.nimb.2007.04.056.
8 Randall G L, Iglesis E, Wong H F, et al. A method of providing directionality for ionising radiation detectors-RadICAL[J]. Journal of Instrumentation, 2014, 9(10):p10011. DOI:10.1088/1748-0221/9/10/p10011.
9 左国平, 谭军文, 周剑良, 等. 基于三角圆筒铅屏蔽NaI探测器的放射源定位研究[J]. 原子能科学技术, 2017, 51(3):515-521. DOI:10.7538/yzk.2017.51.03. 0515.ZUO Guoping, TAN Junwen, ZHOU Jianliang, et al. Study of radioactive source localization based on triangular cylindrical lead shield NaI detector[J]. Atomic Energy Science and Technology, 2017, 51(3):515-521. DOI:10.7538/yzk.2017.51.03.0515.
10 Fujimoto K. A simple gamma ray direction finder[J]. Health Physics, 2006, 91(1):29-35. DOI:10.1097/01.HP. 0000196113.49929.be.

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

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