Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (12): 120402-120402.

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### Efficiency calibration of HPGe detector used in water γ radioactivity measurement

ZENG Guoqiang1, ZHU Zhu1, GE Liangquan1, LUO Mingtao1, YU Peng1, YANG Jian1, YAN Lei1, LAI Maolin1, GUO Shengliang2

1. 1 Key Laboratory of Applied Nuclear Techniques in Geosciences of Sichuan Province, Chengdu University of Technology, Chengdu 610059, China;
2 Chengdu New Nuclear Tyco Technology Co., Ltd., Chengdu 610052, China
• Received:2017-08-28 Revised:2017-10-21 Online:2017-12-10 Published:2017-12-08
• Supported by:
Supported by National Natural Science Foundation of China (No.41474159), National Key R & D Projects (No.2017YFC0602100), Sichuan Science and Technology Project (No.2017GZ0390)

Abstract: Background: To obtain the activity of nuclide in the radioactive measurement of water, it is necessary to know the detection efficiency of nuclide which may be influenced by many factors. Purpose: It is of great practical significance to carry out the efficiency scale of high purity germanium detection device. The high purity germanium detection device selected is based on a real-time on-line monitoring system for the radioactivity of water bodies. Methods: The water samples in the monitored waters were sampled into the low-lead lead rooms, and the radionuclides in water were detected by high purity germanium detectors. The 40K liquid source with a specific activity was prepared using KCl. The γ spectrum was measured and the detection efficiency of 40K was calculated. At the same time, the whole water body monitoring system was modeled and calculated according to the specific parameters given by the manufacturers. The energy efficiency of the γ ray in the range of 59.5-2 614.7 keV was simulated and the efficiency curve was obtained. Results: The deviation of detection efficiency of 40K is found to be 0.018% between the simulation and experimental results. Conclusion: The results verify the feasibility and accuracy of Monte Carlo method in simulating the efficiency scale of high purity germanium detection devices.

CLC Number:

• TL8