Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (8): 80401-080401.doi: 10.11889/j.0253-3219.2019.hjs.42.080401


Radiation-source localization based on three NaI(Tl) crystal detectors

Yang ZHAO Yue ZHANG Zhenchao YAO Xinsen ZUO Guoping ZHOU   

  1. School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
  • Received:2018-10-16 Revised:2019-02-22 Online:2019-08-10 Published:2019-08-26
  • Supported by:
    Hunan Natural Science Foundation(2016JJ2106);Nanhua University Postgraduate Science Foundation Project(2018KYY031)

Abstract: Background

With the wide application of radioactive sources and radioactive materials, the probability of losing radioactive source accidents is increasing.


This study aims to locate lost radioactive sources by using three gamma ray directional detectors.


A gamma ray detection system consisting of three NaI(Tl) crystals was designed. The relationship between the full-energy peak ratio of the three NaI (Tl) detectors in the 137Cs radiation field as a function of distance and incident particle direction was studied by simulation and experiment.


The results show that in the case of long-range detection, the full-energy peak ratio method can effectively eliminate the influence of the source-detector spacing on the angular resolution. For the 1.36×106 Bq 137Cs source at the distance of about 2.58 m, maximum angular deviation of measurement is 1.72° or less, and the relative positional deviation is 3.71%.


The designed three NaI(Tl) crystal detector has stable angular resolution in a certain range and can distinguish the incident direction of rays.

Key words: Source location, Three NaI(Tl) crystal detector, Full-energy peak ratio method

CLC Number: 

  • TL99