Abstract
The water-filled Howitzer had been studied and made in the Nuclear Research Institute (Dalat). It has been the specialized system with multi-function and the unique in Vietnam, that has been used to study experimentally characteristics of neutron in water medium, neutron flux distribution and dose-rate, neutron activation analysis using isotope sources. This report presents the first researches on experimental measurements of neutron flux distributions for sources of 252 Cf and 241 Am-Be (according to horisontal-radius direction) by the technique of neutron activation analysis using the standard foils of gold with cadmium covers and without ones. The experimental results were shown that thermal and epi-thermal neutron fluxes decreased gradually with distances from the source center. This study has been very useful for trainees carrying out measurements of neutron flux distributions and other characteristics using isotope sources.
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