Evaluation of a metal-organic composite (tungsten-lignin) for attenuation of gamma radiation
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The objective of this work was to use tungsten and lignin as precursors to obtain a metal-organic
composite tungsten-lignin (W-Lig) using different sintering temperatures. Tungsten is a refractory metal
and it was selected for the composite since it is widely used for high-energy radiation shielding as it
has an excellent absorption cross section for thermal neutrons. Lignin extracted from lignocelluloses
biomass and it was selected to be the organic precursor for the composite due to its multiple applications.
Analysis of the composite was performed after sintering processes, using a 3D optical surface profiler
and measurement of the gamma radiation attenuation coefficient using cobalt source (Co-60). Metalorganic
composites in ratios of W2.5%Lig and W5%Lig (in mass % of lignin) were used. The gradient
of the attenuation coefficient differed when standard tungsten and the composites of W2.5%Lig and
W5%Lig were compared. Therefore, the attenuation coefficient between unobstructed free radiation and
the W5%Lig 90 ºC composite showed a gradient of about 43% in the two characteristic Co-60 energy
peaks, with a sample thickness of 0.679 cm the calculated linear attenuation coefficient was 0.832 cm-1.
Como referenciar
SOUZA, ARMANDO C. de; CIONE, FRANCISCO C.; SILVA, ALINE C. da; GOUVEA, ADRIANA de F.G.; MACHADO, NOE G.P.; RAELE, MARCUS P.; ROSSI, JESUALDO L. Evaluation of a metal-organic composite (tungsten-lignin) for attenuation of gamma radiation. Materials Research, v. 22, p. 1-5, 2019. S1. DOI: 10.1590/1980-5373-MR-2019-0045. Disponível em: http://repositorio.ipen.br/handle/123456789/30426. Acesso em: 30 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.