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Hashimoto, Shintaro; Nagai, Yasuki*; Minato, Futoshi; Tsukada, Kazuaki
no journal, ,
Study for radioisotopes (RIs) production using accelerator neutron sources plays an important role in development of production method to supply stably RIs for medical use. We measured yields of not only 
Cu produced by neutrons but also 
Ga by protons in 
ZnO samples irradiated by neutrons from 
Be(d,n) reaction with 40-50 MeV deuterons, and developed a powerful method to estimate the yields using a general purpose Monte Carlo particle transport simulation mode PHITS with cross section data of the (d,n) reaction and JENDL-4.0/HE. We found a good agreement between new measured yields and estimated results within a factor of 3. Furthermore, we experimentally observed that yields of Ga are enhanced by covering the samples with polyethylene blocks. However, PHITS cannot reproduce the enhancement probably due to insufficient description of scattered neutrons form the blocks in the calculation.
Hashimoto, Shintaro; Nagai, Yasuki*
no journal, ,
In the study of radioisotope (RI) production using accelerator neutrons, a combination method of the particle transport code PHITS and the induced radioactivity code DCHAIN is powerful tools for calculating the RI production and its time course due to beam irradiation. We improved the method of RI production by neutrons above 20 MeV, which was not sufficiently reliable in the combined calculations. The RI production by neutrons above 20 MeV is usually calculated by a nuclear reaction model, which does not reproduce experimental data well. Therefore, we improved the method by preparing evaluated nuclear data of neutrons above 20 MeV and using it automatically in the combined calculation.