Self-absorptions in fast neutron activation analysis

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Abstract

A Monte Carlo program to determine neutron and gamma elf-attenuations of a sample submitted to fast neutron activation analysis, is described. With respect to previous calculations, the present one follows the neutrons in the sample matrix until their energy is useful to prime the activation reaction and determines the spatial distribution of the produced activity by weighting the spatial neutron presence in the sample with the activation cross section; moreover, as one regards gamma radiation, all secondary particles produced by the interactions of the primary photons with the matrix atoms, are followed. The emission of bremsstrahlung radiations by the secondary electrons, taken into consideration, makes the calculation valid for high-energy gamma activities which cannot always be detected through the low-efficiency full-energy peak only.

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