| JIAO Ling,ZHANG Wen-yi,DING Yan-qiu,et al.Characterization of 7Li(p,n)7Be neutron yields from an accelerator for boron neutron capture therapy[J].Chinese Journal of Radiological Medicine and Protection,2010,30(2):111-115 |
| Characterization of 7Li(p,n)7Be neutron yields from an accelerator for boron neutron capture therapy |
| Received:June 09, 2009 |
| DOI： |
| KeyWords:Neutron Differential cross section Boron neutron capture therapy Foil activation Accelerator |
| FundProject: |
| Author Name | Affiliation | E-mail | | JIAO Ling | Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, China | ljiao.irm@163.com | | ZHANG Wen-yi | Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, China | | | DING Yan-qiu | Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, China | | | ENDO Satoru | 广岛大学原爆放射线医科学研究所 | | | ZHANG Liang-an | Institute of Radiation Medicine, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300192, China | |
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| Abstract:: |
| Objective To provide the scientific basis for investigating and developing neutron source of boron neutron capture therapy(BNCT) by means of studying the characterization of 7Li(p,n)7Be neutron yields induced by an accelerator.Methods When acceleration voltage were 3.0, 2.8 and 2.6 MeV, proton fluxes were accelerated to strike Li target to produce 7Li(p,n)7Be reaction, and the produced neutron fluxes activated 115In metal foils at different directions. γ-rays emitted from 115In foil neutron threshold reaction were measured. Radioactivity of 115In foil were calculated and differential cross sections of 7Li(p,n)7Be were analyzed.Results Neutron fluxes with numerous energy sources were produced at different directions after the nuclear reaction 7Li(p,n)7Be. When the neutron fluxes had the same directions with the proton beam, the differential cross sections of 7Li(p,n)7Be were about 50 mb/mr, but the differential cross sections declined to 30 mb/mr when the angles between the neutron fluxes and the proton beams were 60 degree. Some neutrons with higher energy reached the behind area because of the elastic scattering of neutrons and affected the differential cross sections of the field.Conclusions The neutron distributions can be easily determined simultaneously at several directions via foil activation method. The influence of elastic scattering of neutrons and other metals should be taken into account. After the production of 7Li(p,n)7Be was slowed down, thermal neutron and epithermal neutrons which were suitable for BNCT should be acquired. As BNCT neutron source, the flux of proton beam should be over 10 mA. |
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