Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (1): 10501-010501.doi: 10.11889/j.0253-3219.2020.hjs.43.010501


Experimental study on coincidence efficiency of volume source omnipotence peak based on point source simulation

Wenli QU Guopu ZHAO Yue WANG Lun YE Zhifu ZENG Dekai ZHANG   

  1. University of South China, Hengyang 421001, China
  • Received:2019-09-16 Revised:2019-11-25 Online:2020-01-15 Published:2020-01-21
  • Supported by:
    National Natural Science Foundation of China(11175083);Natural Science Foundation of Hunan Province(2018JJ2314)

Abstract: Background

When the radiation source term lifetime is short and there is a cascade relationship, the standard volume source is difficult to prepare and the background count is too high. In order to solve these two problems, an experimental method based on point source simulation is proposed.


This study aims to improve the lower limit of radioactivity monitoring instrument by using coincidence technology to reduce the effect of background count.


22Na point source was taken as possible replacement of the standard 13N volume source term. The coincidence detection efficiencies of omnipotence peak of 13N with a diameter of 290 mm, 300 mm, 350 mm, 400 mm were measured while the simulation calculation of those efficiencies was carried out with Geant4 software. The experimental measurement results were compared with simulation results.


Within the error range of 9.2%, the experimental results are consistent with the simulation results.


The results show that proposed method is feasible and reliable, and can be used in practical nuclear power sheet.

Key words: Point source simulation test, Short-life source term, Omnipotence peak, Coincidence efficiency

CLC Number: 

  • TL81