Monte Carlo calculation of buildup factors for 50 keV-15 MeV photons in tungsten up to 15 mean free paths

Dariush Sardari; Samaneh Baradaran; Farshid Babapour Mofrad; Nazanin Marzban

doi:10.1016/j.apradiso.2022.110150

Monte Carlo calculation of buildup factors for 50 keV-15 MeV photons in tungsten up to 15 mean free paths

Appl Radiat Isot. 2022 May:183:110150. doi: 10.1016/j.apradiso.2022.110150. Epub 2022 Feb 17.

Authors

Dariush Sardari¹, Samaneh Baradaran², Farshid Babapour Mofrad³, Nazanin Marzban³

Affiliations

¹ Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran. Electronic address: [email protected].
² Nuclear Science and Technology Research Institute, Tehran, Iran.
³ Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

PMID: 35231848
DOI: 10.1016/j.apradiso.2022.110150

Abstract

Exposure buildup factor values of tungsten for a point isotropic source in energy range 0.05-15 MeV up to 15 mfp are computed using Monte Carlo N-Particle code. Buildup factors of this study and ANSI/ANS-6.4.3 at some selected energies and penetration depths are compared. Highest discrepancies are observed for high-energy and/or high penetration depths. Highest error occurs at 15 MeV, amounting to 32%. In the energy range 2-6 MeV, our results show smaller values for all penetration depths and vice versa at higher energies.

Keywords: Buildup factor; MCNP; Monte Carlo simulation; Shielding; Tungsten.