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Photon energy absorption buildup factors of gaseousmixtures used in radiation detectors

Published online by Cambridge University Press:  06 December 2012

V.P. Singh  and
N.M. Badiger
V.P. Singh
Affiliation:
Department of Physics, Karnatak University, Dharwad 580003, India Health Physics Section, Kaiga Atomic Power Station-3&4, NPCIL, Karwar, Karnatak 581400, India. e-mail: kudphyvps@rediffmail.com
N.M. Badiger
Affiliation:
Department of Physics, Karnatak University, Dharwad 580003, India
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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, Zeq of the gaseous mixtures sharply reduces after 1 MeV photon energy. The Zeq 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.

Keywords

equivalent atomic numbergammaEABFG-P fittinggaseousdetectorreactorprotectionabsorptionCompton scattering
Type
Research Article
Information
Radioprotection , Volume 48 , Issue 1 , January 2013 , pp. 63 - 78
Copyright
© EDP Sciences, 2012

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References

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