Gamma ray buildup factors for conventional shielding materials and buildup factors computed for tungsten with a thickness beyond 40 mean free paths

Pew Basu; R Sarangapani; B Venkatraman

doi:10.1016/j.apradiso.2019.108864

Gamma ray buildup factors for conventional shielding materials and buildup factors computed for tungsten with a thickness beyond 40 mean free paths

Appl Radiat Isot. 2019 Dec:154:108864. doi: 10.1016/j.apradiso.2019.108864. Epub 2019 Aug 16.

Authors

Pew Basu¹, R Sarangapani², B Venkatraman³

Affiliations

¹ Safety, Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, 603102, India; Homi Bhabha National Institute, Kalpakkam, Tamilnadu, 603102, India. Electronic address: [email protected].
² Safety, Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, 603102, India.
³ Safety, Quality & Resource Management Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, 603102, India; Homi Bhabha National Institute, Kalpakkam, Tamilnadu, 603102, India.

PMID: 31442795
DOI: 10.1016/j.apradiso.2019.108864

Abstract

In this study, gamma ray buildup factors were investigated for conventional shielding materials such as lead, iron, concrete, and tungsten based on standard formulations in order to understand the variations between different formulations. The exposure buildup factors for 1 MeV gamma rays in lead, iron, and concrete for thicknesses beyond 40 mean free paths were computed using the modified geometric progression fitting formula and compared with previously reported data. For the first time, the exposure buildup factors were computed for tungsten at gamma ray energies from 15 keV to 15 MeV and for a penetration depth beyond 40 mean free paths.

Keywords: Exposure buildup factor; Geometric progression fitting form; Tungsten.