Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (06): 60202-060202.doi: 10.11889/j.0253-3219.2014.hjs.37.060202

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

Preliminary study of sample uniformity impact on the elemental analysis in PGNAA technique

HEI Daqian CHENG Can JIA Wenbao SHAN Qing LING Yongsheng   

  1. (College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
  • Received:2013-10-23 Revised:2014-01-09 Online:2014-06-10 Published:2014-06-04

Abstract: Background: In the adoption of Prompt Gamma-ray Neutron Activation Analysis (PGNAA) technique, the composition of samples is always assumed to be uniform, while it is nonuniform in fact, which would affect the analysis result. Purpose: The influence of the sample’s uniformity to PGNAA has been discussed. Methods: Samples of the same composition and average density, but different uniformity have been simulated with Monte Carlo method. And the preliminary analysis has been discussed in the aspects of self-absorption and the neutron field distribution of the samples. Results: The results show that the change of sample uniformity has a certain effect on the gamma-rays spectrum. The difference of the element characteristic peak counting rate, which is caused by the change of samples’ uniformity, is even higher than 20% for some elements. Conclusion: In the PGNAA technique, the uniformity of samples has to be considered to ensure the element analysis accuracy.

Key words: Prompt Gamma-ray Neutron Activition Analysis (PGNAA) technique, Uniformity, Elemental analysis, Neutron field distribution, Self absorption