GEANT4 simulation of the characteristic gamma-ray spectrum of TNT under soil induced by DT neutrons

The characteristic gamma-ray spectrum of TNT in the soil induced by DT neutrons is measured by the PFTNA demining system. The GEANT4 toolkit is used to simulate the whole experimental procedure. The simulated spectra are compared with the experimental spectra, and they are mainly consistent. The sha...

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Bibliographic Details
Published in:核技术（英文版） 2015-02, Vol.26 (1), p.38-43
Main Author: QIN Xue ZHOU Rong HAN Ji-Feng YANG Chao-Wen
Format: Article
Language:English
Subjects:
GEANT4
TNT
中子
伽玛射线
光谱
土壤
模拟
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Summary:The characteristic gamma-ray spectrum of TNT in the soil induced by DT neutrons is measured by the PFTNA demining system. The GEANT4 toolkit is used to simulate the whole experimental procedure. The simulated spectra are compared with the experimental spectra, and they are mainly consistent. The share of the background sources such as neutrons and gamma is obtained and the contribution that the experimental apparatus to the background, such as shielding, detector sleeve and moderator, is analyzed. The effective gamma signal （from soil and TNT） is 29% of the full spectrum signal, and the background signal, more than 68%, this is mainly produced by shielding and the detector sleeve. By gradually optimizing the shielding and the cadmium sheet of the detector sleeve, the share of the effective gamma signal increases to 47%, and the background signal reduces to 18%.
ISSN:1001-8042
2210-3147
DOI:10.13538/j.1001-8042/nst.26.010501