Study for the obtainment of the W-Cu-Ni system composite applying powder metalurgy for use as a radiation shielding material for gamma ray attenuation
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2018
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
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Resumo
The metallic composite material of the tungsten-copper-nickel system (W-Cu-Ni)
produced by powder metallurgy (P/M) presented has adequade characteristics to be
an alternative material for gamma (?) radiation attenuation. Lead and depleted uranium
are the materials commonly used for radiation atenuattion. They are materials with
certain toxicity and aggressiveness to the environment. The W-Cu-Ni composites are
non-toxic and do not present environmental risks. The tungsten, matrix metal of the
composite, has as property its atomic density that is directly proportional to the
electrons of its atoms important for the purpose of effects of radiation attenuation. For
the preparation of the composite samples, the size of the metallic particles was
determined and selected. In order to homogenize the metallic particle distribution and
to reduce the average particle size, a ball mill was used for 12, 24 and 36 hours. After
grinding, the particle size analysis presented the mean particle size of 12 ?m was
observed. After the sintering step, in the micro-hardness tests an average of 303.3 HV
was achieved for the composition W6Cu1Ni. To measure the absorption of radiation in
the samples the classical scientific method of narrow beam geometry (NBG)
experiments was employed. The gamma radiation source of cobalt-60 was selected to
study the effects and adjustments on the values of the Half-Value Layer and (HLV) in
the dimensions of the required shielding thickness. For unpublished composite sample
W6Cu1Ni the HLV method indicated the necessity of 9.27 mm of thickness in the
obtained density of 13.38 g.cm-3, superior to the density of lead (11,34 g.cm-3). As a
comparative, database from the XCOM (NIST) were used and demostrating
convergence between the simulated values of 9.15 mm and the experimental values
obtained.
Como referenciar
CIONE, F.C.; ROSSI, J.L.; SOUZA, A.C. Study for the obtainment of the W-Cu-Ni system composite applying powder metalurgy for use as a radiation shielding material for gamma ray attenuation. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 2878-2878. Disponível em: http://repositorio.ipen.br/handle/123456789/29625. Acesso em: 31 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.