Photon energy absorption buildup factors of gaseous mixtures used in radiation detectors

Abstract

Gamma-ray energy absorption buildup factors of gaseous mixtures; neon (95%) + argon (5%), argon (95%) + acetylene (5%) , argon (95%) + methane (5%), argon (95%) + carbon dioxide (5%), methane (70%) + pentane (30%) and argon (90%) + methane (10%) were studied by Geometrical Progression (G-P) fitting for the photon energy range 0.015-15 MeV. It was found that the equivalent atomic number, Z eq of the gaseous mixtures sharply reduces after 1 MeV photon energy. The Z eq for the mixture of methane (70%) + pentane (30%) is the minimum, whereas the maximum is for argon (95%) + carbon dioxide (5%) for the photon energies under investigation. The Energy Absorption Buildup Factor (EABF) for methane (70%) + pentane (30%) was found to be the highest among all the selected gaseous mixtures. The chemical composition of the gaseous mixtures has an impact on the EABF values for photon energy and penetration depth. The investigation of the EABF is useful for selection of gaseous mixtures in design consideration of gaseous radiation detectors for gamma radiation.

Shielding efficiency of metal hydrides and borohydrides in fusion reactors

“…Var i ous re search ers have used geo met ric-progres sion (G-P) fit ting to de ter mine gamma ray buildup fac tors for al loys [6], fly-ash ma te ri als [8], con crete shield ing [5], brick ma te ri als [9], gas eous mix ture [10], thermoluminescent dosimetric ma te ri als [11], heavy metal ox ide glasses [12], and hu man or gans and tis sues [13]. These stud ies show that G-P fit ting is useful for es ti mat ing buildup fac tors.…”

The gamma-ray and neutron shielding factors of fly-ash brick materials

“…Harima et al made an extensive historical review and reported gamma-ray build-up factors [3]. Various researchers have investigated gamma-ray build-up factors of different materials such as concrete [8,9], gaseous mixtures [10], human tissues [11] and soils and ceramics [12,13] which showed that the GP fitting is a very useful method for estimating build-up factors. Recently, radiation shielding by fly-ash concrete [14] has been reported.…”