Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2015, Vol. 26 ›› Issue (1): 010501 doi: 10.13538/j.1001-8042/nst.26.010501

• NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

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

QIN Xue1,2,ZHOU Rong1,2,HAN Ji-Feng 1,2,YANG Chao-Wen 1,2   

  1. 1College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
    2Key Laboratory of Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610064, China
  • Contact: ZHOU Rong E-mail:zhourong@scu.edu.cn
  • Supported by:

    Supported by NSAF(No. 11076020)

QIN Xue,ZHOU Rong,HAN Ji-Feng,YANG Chao-Wen . GEANT4 simulation of the characteristic gamma-ray spectrum of TNT under soil induced by DT neutrons.Nuclear Science and Techniques, 2015, 26(1): 010501     doi: 10.13538/j.1001-8042/nst.26.010501

Abstract:

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%.

Key words: GEANT4, Neutron induced, Characteristic gamma-ray spectrum, Background contribution