Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (2): 20401-020401.

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### Influence of the support body on radiation detection for gamma radiator

ZHAO Juan1, GAO Zhengming2

1. 1 School of Electronics and Information Engineering, Jingchu University of Technology, Jingmen 448000, China;
2 Baoji Research Institute of High Technology, Baoji 721013, China
• Received:2015-10-12 Revised:2015-12-16 Online:2016-02-10 Published:2016-02-17
• Supported by:

Supported by National Defense Pre-research Projects (No.51331040501)

Abstract:

Background: The datum error of the gamma detection on large-mass and high security controlled radioactive materials is too large for quantitative analysis. Purpose: This study aims to accurately measure the radiation of gamma radioactive materials placed upon support body. Methods & Results: Based on the theory of particle flux parameters on the cross section of detection, the method to calculate the influence of the support body on radiation detection was simplified. Then, simulations were done to find the error distributions with Monte Carlo method when the materials were placed on the concrete ground. In order to reduce the detection error, a plate of lead was recommended to be inserted between the materials and the concrete ground. The best thickness of the lead layer was simulated and experimental verification was performed. Results: Simulation results show that if a lead layer thicker than 0.5 cm exists between the radioactive materials and the concrete ground. The relative detection error could be reduced from 22% to 15% or even the least of 10% in some particular situations. Conclusion: If a large-mass or high security controlled gamma radiator would be detected, it should be placed on a lead layer thicker than 0.5 cm in case of reducing the datum errors.

CLC Number:

• TL81