α, f and Tn dependence of slowing-down thickness and its influence for k0-standardization of INAA

The experimental dependence of the α, f and Tn parameters, in function of the water thickness, for different irradiation channels of TRIGA Mark III reactor, were analyzed. An exponential law for the α(r) dependence, was obtained in the neighborhood of the active zone of the reactor numerically modeled using the Sn method for 69 neutrons groups, and this dependence is slower in light water reactors than in graphite reactors. Nevertheless this influence was not experimentally observed because the magnitude of the experimental errors. (author)