1.
Appl Radiat Isot
; 154: 108864, 2019 Dec.
Article
in English
| MEDLINE
| ID: mdl-31442795
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 1â¯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 15â¯keV to 15â¯MeV and for a penetration depth beyond 40 mean free paths.