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A simulation study on beam property of 124Sb-Be isotope-based neutron for BNCT
Kenichi Tanaka1, Tsuyoshi Kajimoto1, Yoshinori Sakurai2
1Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Japan.
Abstract:
The 9Be(γ,n) neutrons with the energies at 21-24 keV generated by 1.691 MeV photons from 124Sb was investigated as a source of epithermal neutrons for BNCT, using PHITS code. A beam shaping assembly composed of 13 mm thick Be target, a gamma ray shield made of 30 cm thick Bi, and a reflector of 30 cm thick Pb satisfied the beam requirements of IAEA-TECDOC-1223. The needed 124Sb activity was estimated in the order of 1016-1017 Bq. Feasibility of BNCT using 124Sb-Be neutrons would be influenced by the capability of periodic supply of short-lived 124Sb (half-life: 60 days) with such high activity.
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