Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (04): 40201-040201.

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS •

### Detection efficiency simulation and measurement of 6LiI/natLiI scintillation detector

DU Long1,2 CHANG Le1,3 WANG Yuting1,2 ZHANG Song1,4 CAO Xiguang1,4 WANG Hongwei1,2,4 ZHANG Guoqiang1,4 ZHONG Chen1,4 LI Chen1,4

1. 1(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(University of Chinese Academy of Sciences, Beijing 100049, China) 3(Henan Normal University, Academy of Physics and Electronic Engineering, Xinxiang 453007, China) 4(Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences, Shanghai 201800, China)
• Received:2013-12-27 Revised:2014-03-05 Online:2014-04-10 Published:2014-04-11

Abstract:

Background: Being of very high detection efficiency and small size, Lithium iodide (LiI) scintillator detector is used extensively in neutron measurement and environmental monitoring. Purpose: Using thermal reactor, neutron detectors will be tested and calibrated. And a new neutron detector device will be designed and studied. Methods: The relationship between the size and detection efficiency of the thermal neutron detector 6LiI/natLiI was studied using Monte Carlo code GEANT4 and MCNP5 package, and the thermal neutron efficiency of detector was calibrated by reactor neutrons. Results: The theoretical simulation shows that the thermal neutron detection efficiency of detector of 10-mm thickness is relatively high, the enriched 6LiI is up to 98% and the nature natLiI 65%. The thermal neutron efficiency of detector is calibrated by reactor thermal neutrons. Considering the neutron scattering by the lead brick, high density polythene and environment neutron contribution, the detection efficiency of 6LiI detector is about 90% and natLiI detector 70%. Conclusion: The detector efficiency can reach the efficiency value of theoretical calculations.