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Particle release from niobium under 14-MeV neutron impact

Description: The particle release from cold-rolled and annealed polycrystalline niobium surfuces under 14-MeV neutron impact to a total dose of 4.6 x 10/sup 15/ neutrons/cm/sup 2/ was investigated in two separate runs at ambient temperature and under ultrahigh and high-vacuum conditions, respectively. The type and amount of material released and deposited on a substrate surface were determined independently by four analytic techniques. Surprisingly. there were two types of deposits---one in the form of large chunks. the other a more even layer covering the surface. For the cold-rolled niobium sample with a surface finish of 5 mu m the estimated particle release value is S = 0.25 plus or minus 0.10 niobium atoms per incident 14-MeV neutron. A model for the chunk emission is suggested. (auth)
Date: January 1, 1973
Creator: Kaminsky, M. & Das, S.K.
Partner: UNT Libraries Government Documents Department