Spectrum evaluation at the filter-modified neutron irradiation field for neutron capture therapy in Kyoto University Research Reactor
✍ Scribed by Yoshinori Sakurai; Tooru Kobayashi
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 357 KB
- Volume
- 531
- Category
- Article
- ISSN
- 0168-9002
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✦ Synopsis
The Heavy Water Neutron Irradiation Facility of the Kyoto University Research Reactor (KUR-HWNIF) was updated in March 1996, mainly to improve the facility for neutron capture therapy (NCT). In this facility, neutron beams with various energy spectra, from almost pure thermal to epithermal, are available. The evaluation of the neutron energy spectra by multi-activation-foil method was performed as a series of the facility characterization. The spectra at the normal irradiation position were evaluated for the combinations of heavy-water thickness of the spectrum shifter and the open-close condition of the cadmium and boral filters. The initial spectra were made mainly using a twodimensional transport code, and the final spectra were obtained using an adjusting code. For the verification of the evaluated spectra, simulation calculations using a phantom were performed on the assumption of NCT-clinicalirradiation conditions. It resulted that the calculated data for the depth neutron-flux distributions were in good agreement with the experimental ones.