Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (01): 10205-010205.doi: 10.11889/j.0253-3219.2014.hjs.37.010205

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Effects of food sample density on detecting results of HPGe γ-spectrometer

WAN Yongliang1 TIE Lieke1 ZHU Xia1 LIU Mohan2 LIU Jinhao1   

  1. 1(Xinjiang Entry-Exit Inspection and Quarantine Bureau, Urumqi 830063, China) 2(School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China)
  • Received:2013-09-04 Revised:2013-10-12 Online:2014-01-10 Published:2014-01-20
  • Contact: Yong-Liang WAN E-mail:yongliangwan@sina.com

Abstract:

Background: According to the requirements of GB/T 16145-1995, the sample must be of the same mass density with standard source in the measurement of radiation activity with HPGe γ-ray spectrometer, but the density of the sample is hardly consistent with the standard source in laboratory. Purpose: The aim is to study the effect of the samples in different densities on measurement results. Methods: Firstly, the net count rates (n) of the six samples in various mass densities are measured using HPGe γ-ray spectrometer, and the respective self-absorption coefficients are calculated. Secondly, the sample-model is established using sourceless efficiency calibration software-Gammaclib. And then the detection efficiency and self-absorption coefficient are obtained. Results: The detection results show that with the raise of density, the self absorption coefficients are decreased. Conclusion: The results by both methods indicate that the differences of the density between sample and standard source have obvious influences on the measurement results and need self-absorption correction.

Key words: HPGe γ-ray spectrometer, Self-absorption correction, Sourceless efficiency calibration method, Detecting efficiency