Simulation of the gadolinium neutron capture reaction using Geant4
DOI:
https://doi.org/10.32685/2590-7468/invapnuclear.3.2019.508Keywords:
gadolinium, neutron capture, Auger electrons, LET
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Abstract
The use of gadolinium nuclides as neutron capture agents in neutron capture cancer therapy is of great interest, mainly because of these nuclides’ high cross-section of 225,000 barns. The final state spectrum of the reaction contains gadolinium-158 (Gd-158), photon emission (X-rays and gamma rays) and electrons (internal conversion and Auger electrons). This spectrum offers very rich physics and enormous potential for the elimination of tumor cells due to high linear energy transfer. In this article, we present simulations of this process performed using the last six versions of Geant4 (10.00.p04, 10.01.p03, 10.02.p03, 10.03.p03, 10.04.p03 and 10.05.p01). Given that we are particularly interested in low-energy neutrons (energies <20 MeV) in this work, we used the G4NeutronHP package. Finally, we obtained the event count, the average energy and the angular distributions (theta and phi) of particles in the final state and find that for low-energy neutrons, study of the neutron capture reaction by Gd-158 with Geant4 is viable.
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