2004 Fiscal Year Final Research Report Summary
Development of the evaluation method of radioactivity in materials obtained from garious accelerator facilities
| Project/Area Number |
14380240
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | High Energy Accerelator Research Organization (2004)
The High Energy Accelerator Research Organization (2002-2003) |
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Principal Investigator |
SHIBATA Tokushi High Energy Accerelator Research Organization, Radiation Science Center, Prfesssor, 放射線科学センター, 教授 (80028224)
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| Co-Investigator(Kenkyū-buntansha) |
MASUMOTO Kazuyoshi High Energy Accerelator Research Organization, Radiation Science Center, Assistant Professor, 放射線科学センター, 助教授 (60124624)
MIURA Taichi High Energy Accerelator Research Organization, J-PARK Project Office, Assistant Professor, 大強度陽子加速器計画推進部, 助教授 (80209717)
NUMAJIRI Masaharu High Energy Accerelator Research Organization, Radiation Science Center, Assistant, 放射線科学センター, 助手 (20189385)
MATSUMURA Hiroshi High Energy Accerelator Research Organization, Radiation Science Center, Asastart, 放射線科学センター, 助手 (30328661)
HIRAYAMA Hideo High Energy Accerelator Research Organization, Radiation Science Center, Proffesor, 放射線科学センター, 教授 (00044785)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Accelerator / Activated Materials / Clearance / Radioactivity / AMS / Concrete / Chlorine-36 / Tritium |
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| Research Abstract |
Reccently, the clearance level has been in the spotlight for the safety release from the facilities to environment. As there were only few data on activation in the case of accelerator facilities, it is very important to develop the evaluation method of various radionuclides observed in activated materials on accelerator facilities. In this work, we focused on the development of analytical technique of tritium and chroline-26, which are very difficult to determine. We adopted the IR fumace for tritium separation This method can be characterized as rapid, simple and quantitative separation of tritium form concrete samples. To determine chlorine-36, we adopted AMS method after purification of chlorine from concrete samples. It was found that this method is very high sensitive and the data of chlorine-36 are very useful to measure the integrated neutron fluence emitted from accelerator facility. Then, we analyzed the concrete samples obtained from various accelerator facilities, because the concrete is used for the structure material in the facility and their volumes are very large. It was found that the major source of activation is thermal neutrons seconarily emitted from accelerators. The maximum yield of thermal neutron capture reaction was at the depth of about 10km from the surface.
The second work was the study of the activation induced by high energy neutron reactions. We constructed tine imadiation facility of neutron produced from the thick tungsten target bombarded by 500MeV proton Neutron flux was changed exponentially in the concrete shield, but the spectra did not change thoughout the shield Not only low energy neutron reaction but also spallation reaction induced by high energy neutron observed in the various target materials were analyzed.
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Research Products
(12 results)
