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Updated: Apr 5, 2026

Sample Preparation and Experimental Design for In Situ Multi-Beam Transmission Electron Microscopy Irradiation Experiments
Published on: June 27, 2022
Optimal moderator materials at various proton energies considering photon dose rate after irradiation for an
Y Hashimoto1, F Hiraga2, Y Kiyanagi3
1Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan.
Abstract:
We evaluated the accelerator beam power and the neutron-induced radioactivity of (9)Be(p, n) boron neutron capture therapy (BNCT) neutron sources having a MgF2, CaF2, or AlF3 moderator and driven by protons with energy from 8 MeV to 30 MeV. The optimal moderator materials were found to be MgF2 for proton energies less than 10 MeV because of lower required accelerator beam power and CaF2 for higher proton energies because of lower photon dose rate at the treatment position after neutron irradiation.
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