Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (1): 10501-010501.doi: 10.11889/j.0253-3219.2018.hjs.41.010501


Theoretical study of the phenomenon that right is higher than left in full-energy peak of the γ spectrum

LIU Wenbiao, CHEN Wei, TIAN Zining, WANG Xuemei, SU Chuanying, FENG Tiancheng   

  1. Northwest Institute of Nuclear Technology, Xi'an 710024, China
  • Received:2017-08-07 Revised:2017-10-24 Online:2018-01-10 Published:2018-01-06
  • Supported by:

    Supported by National Natural Science Foundation of China (No.11405134)


Background: The phenomenon that right is higher than left in full-energy peak of the γ spectrum in the high active sample using HPGe gamma-ray spectrometry in laboratory, brings error into the gamma-radioactive nuclide analysis. Purpose: This paper aims to explain the phenomenon to realize accurate quantitative analysis. Methods: The theoretical formula of the right-to-left ratios was developed, and experiment was designed to prove it. Results: The experiment indicates that the theoretical calculation is right. The research achievement shows that the phenomenon is caused by accidental coincidence. Conclusion: The right-to-left ratios increase first, then decrease with the higher dead time. When the dead time is lower than 1.0%, the right is approximate equal to the left in full energy peak. With the dead time is higher than 1.0% and lower than 4.0%, the ratios increases with the dead time. As the dead time is higher than 4.0% and lower than 56%, the ratios decreases with the dead time. Comparing the experiment with LabSOCS, it indicated that the phenomenon has no influence on analysis of the point source.

Key words: &gamma, spectrometry, Full-energy peak, Accidental coincidence

CLC Number: 

  • TL81