Monte Carlo modelling of a neutron-induced gamma-ray sensor for landmine or explosive detection

Abstract

Monte Carlo simulations were carried out to model a thermal neutron-induced gamma-ray sensor for anti-personnel-landmine (APM) or explosive detection. This is done by employing the thermal neutron prompt gamma activation (TNPGA) technique. The neutron capture reaction on nitrogen 14 N(n,γ) 15 N is analyzed to detect the subsequent characteristic 10.8 MeV gamma rays. This is done by modelling a suitable geometry consisting of a point 252 Cf source placed inside a sphere of lead (Pb) which is contained in a cylinder of high density polyethylene (HDPE), together with a NaI (Tl) detector. The sensor geometry was optimized and the optimal configuration was selected to scan a plastic APM buried (2-10) cm. The Monte Carlo results obtained in terms of variations of the signal-to-background ratio, indicated the feasibility of employing 14 N(n,γ) 15 N neutron capture reaction for landmine detection and the suitability of the proposed sensor for airport explosives as well.

Process Technology for Development and Performance Improvement of Medical Radiation Shield Made of Eco-Friendly Oyster Shell Powder

“…It also reacts easily with oxygen and water, and exists in the form of a calcium carbonate compound in nature. Compared to lead with an atomic number of 82 and a density of 11.34 g/cm 3 , calcium exhibits inferior radiation shielding [21].…”

Microdosimetry-based investigation of biological effectiveness of 252Cf brachytherapy source: TOPAS Monte Carlo study

“…O(n, nγ) 16 O reaction with the source active core material (Cf 2 O 3 ) as well as in water medium. Note that 16 O(n, nγ)16 O reaction with fast neutrons yield 6.13 MeV characteristic γ rays(Burrows 2006, Elsheikh 2018 Ir(n,γ)192 Ir and 195 Pt(n,γ)196 Pt yield spectrum of gamma photons(Burrows 2006). 191 Ir has significant cross section for (n, γ) reactions for neutrons below 100 keV(Burrows 2006).…”