Article: Study of gamma attenuation properties of tungsten copper alloys Journal: International Journal of Nuclear Energy Science and Technology (IJNEST) 2016 Vol.10 No.4 pp.356 - 368 Abstract: Gamma attenuation parameters such as mass attenuation coefficient, effective atomic numbers, electron density, buildup factor, and specific absorbed fraction of energy of tungsten copper alloys (CuW(50), CuW(55), CuW(60), CuW(65), CuW(70), CuW(75), CuW(80), CuW(85) and CuW(90)) are evaluated. G-P fitting method has been used to compute energy absorption build-up factor for a wide energy range (0.015-15 MeV). The computed absorption build-up factor is used to estimate specific absorbed fraction of energy. The thickness of the medium up to 10 mm and with penetration depth up to 40 mean free paths is considered. The dependence of the specific absorbed fraction of energy on incident photon energy, penetration and the thickness of the medium has also been studied. These gamma attenuation parameters change with the energy. For a given alloy's Z<SUB align="right"><SMALL>eff</SMALL></SUB>, buildup factors and specific absorbed fraction of energy values are minimum for CuW(50) and maximum for CuW(90). The mass attenuation coefficients and electron density values for CuW(50) are higher than for CuW(90). The present study is useful in the selection of gamma shielding materials. Inderscience Publishers - linking academia, business and industry through research

Title: Study of gamma attenuation properties of tungsten copper alloys

Authors: H.C. Manjunatha; B.M. Chandrika; L. Seenappa; Chikka Hanumantharayappa

Addresses: Department of Physics, Government College for Women, Kolar 563101, Karnataka, India ' Shravana, #592, Ist Cross, PC Extension, Kolar 563101, Karnataka, India ' Department of Physics, Government College for Women, Kolar 563101, Karnataka, India ' Vivekananda Degree College, Bangalore 560 055, Karnataka, India

Abstract: Gamma attenuation parameters such as mass attenuation coefficient, effective atomic numbers, electron density, buildup factor, and specific absorbed fraction of energy of tungsten copper alloys (CuW(50), CuW(55), CuW(60), CuW(65), CuW(70), CuW(75), CuW(80), CuW(85) and CuW(90)) are evaluated. G-P fitting method has been used to compute energy absorption build-up factor for a wide energy range (0.015-15 MeV). The computed absorption build-up factor is used to estimate specific absorbed fraction of energy. The thickness of the medium up to 10 mm and with penetration depth up to 40 mean free paths is considered. The dependence of the specific absorbed fraction of energy on incident photon energy, penetration and the thickness of the medium has also been studied. These gamma attenuation parameters change with the energy. For a given alloy's Z_eff, buildup factors and specific absorbed fraction of energy values are minimum for CuW(50) and maximum for CuW(90). The mass attenuation coefficients and electron density values for CuW(50) are higher than for CuW(90). The present study is useful in the selection of gamma shielding materials.

Keywords: buildup factor; tungsten copper alloys; G-P fitting method; gamma shielding materials; gamma attenuation properties; mass attenuation coefficient; effective atomic numbers; electron density; specific energy absorption fraction; materials selection; gamma radiation.

DOI: 10.1504/IJNEST.2016.082005

International Journal of Nuclear Energy Science and Technology, 2016 Vol.10 No.4, pp.356 - 368

Received: 09 Aug 2016
Accepted: 27 Nov 2016
Published online: 31 Jan 2017 *

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Title: Study of gamma attenuation properties of tungsten copper alloys

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