Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (4): 40202-040202.

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS •

Monte Carlo simulation and design of gantry system for r radiation detection

WANG Qibiao1 TUO Xianguo2,3,4 HUANG Hong1 MA Qiao5 WANG Xu1 DENG Li1 YANG Jianbo1,2

1. 1(Provincial Key Laboratory of Applied Nuclear Techniques in Geosciences, Chengdu University of Technology, Chengdu 610059, China) 2(Key Laboratory of Earth Exploration & Information Techniques of Ministry of Education, Chengdu University of Technology, Chengdu 610059, China) 3(State Key Laboratory of Geo-hazard Prevention & Geo-environment Protection, Chengdu University of Technology, Chengdu 610059, China) 4(Key Laboratory of Defensive Discipline on Nuclear Wastes and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, China) 5(Sichuan Provincial Disease Prevention and Control, Chengdu 610041, China)
• Received:2014-06-21 Revised:2014-09-16 Online:2015-04-10 Published:2015-04-09

Abstract: Background: The peaceful use of radioactive materials is a huge wealth for humans, but illegal transfer of radioactive materials brings a serious potential safety hazard to the public security. Purpose: This study aims to design a gantry system for ? radiation detection to avoid the illegal transfer of radioactive materials. Methods: MCNP code is used to simulate the system which measured two typical ? sources (137Cs and 60Co) using two plastic scintillator detectors (EJ200) in the size of 200 cm × 40 cm × 6 cm. Nuclides are identified by analyzing the spectrum, and locations are obtained according to the response of NaI(Tl) detector array. Results: Theoretical computation results showed that ?radiation detection limitation of this system was identified to be 370 Bq for both 137Cs and 60Co, characteristic peaks can be identified effectively, and locations of 137Cs are obtained rapidly and accurately. Conclusion: This system satisfies the use of crowd places well, and prevents ? radioactive sources from transferring illegally in the event of a nuclear accident.