Determination of the U-238 spontaneous fission decay constant without neutron irradiation
Nenhuma Miniatura disponível
Data
2002-07-01
Autores
Guedes, S.
Hadler, J. C.
Iunes, P. J.
Burke, A. K.
Kazazu, M. H.
Sarkis, JES
Paulo, SR
Tello, C. A.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Kluwer Academic Publ
Resumo
We have developed a methodology for measuring the decay constant of the spontaneous fission of U-238, lambda(f), using nuclear particle track detectors where thermal neutron irradiation is unnecessary. This methodology is based on the fact that the radiation damage caused by spontaneous fission of trans-uranium elements bearing a mass number close to 238 are similar to U-238 spontaneous-fission ones. Loading a thick source of uranium (thickness greater than the fission fragment range) with a small amount of a suitable trans-uranium element (for instance, Pu-242, which presents a spontaneous fission half-life of 6.75(.)10(10) y), it is possible to determine the observation efficiency of a particle-track detector for fission fragments. Procedures concerning our thick source manufacture and uniformity tests of the trans-uranium distribution are also presented. These results make it possible for the exposure of thick uranium sources (without trans-uranium element) to lead to a lambda(f) value.
Descrição
Palavras-chave
Como citar
Journal of Radioanalytical and Nuclear Chemistry. Dordrecht: Kluwer Academic Publ, v. 253, n. 1, p. 73-76, 2002.