Abstract
We investigated an alternative irradiation method for silicon doping using a thermal neutron filter to increase the irradiation efficiency in the Japan Research Reactor No. 3 (JRR-3). Aluminum mixed B4C particles were adopted as the filter material. The burn-up characteristics of a thermal neutron filter containing a large number of B4C particles are described. We have developed a method for evaluating neutron transmissivity as Boron burning in the neutron filter and clarified the applicable scope of the method via experiments using thermal neutron filters. We derived a method by which we could calculate the suitable diameter and density of B4C particles.
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