Author(s)

V. F. Batyaev, S. G. Belichenko, R. R. Bestaev

Abstract

The paper concerns potential of numerical simulation for assessment of characteristics of tagged neutron device. The CERN Geant4 code and TPT2 (Toolkit for Particle Transport) code developed in VNIIA were used to simulate the γ-neutron transport in components of the tagged neutron device and recording of ionizing radiation by the scintillation detector. The numerical simulation was corrected and validated by experimentations with the model of the device of the same geometry, type of detector, materials. At first, we obtained a spectral response of LYSO scintillator under γ- and neutron radiation and satisfied that it was close to the measured data. Using the detector response, the instrumental spectra of the tagged neutron device including the neutron generator, LYSO scintillating detector and tetryl/sugar as an object of interrogation were calculated. A good agreement of coefficients of decomposition of experimental and calculated spectra let us validate that Geant4 and TPT2 codes can be used for the reliable numerical simulation of various configurations of the tagged neutron device.

Keywords

explosive detection, fast neutrons, tagged neutrons, associated particle imaging, Monte-Carlo simulation