2018 Fiscal Year Annual Research Report
Establishment of Isotope 3D imaging by LCS-NRF Method
| Project/Area Number |
18H01916
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| Research Institution | Kyoto University |
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Principal Investigator |
大垣 英明 京都大学, エネルギー理工学研究所, 教授 (10335226)
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| Co-Investigator(Kenkyū-buntansha) |
加藤 政博 分子科学研究所, 極端紫外光研究施設, 教授 (30185871)
静間 俊行 国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所 東海量子ビーム応用研究センター, 上席研究員(定常) (50282299)
早川 岳人 国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所 東海量子ビーム応用研究センター, 上席研究員(定常) (70343944)
豊川 弘之 国立研究開発法人産業技術総合研究所, 計量標準総合センター, 研究グループ長 (80357582)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | 同位体イメージング / 光核共鳴散乱 / レーザーコンプトンガンマ線 / CT |
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| Outline of Annual Research Achievements |
A Nuclear Resonance Fluorescence (NRF) method is a powerful tool for investigation not only of the nuclear physics, but also of isotope imaging inside the spent nuclear fuel canisters and nuclear wastes. We have been developing an isotope imaging technique by using NRF. The absorption can be measured by sample material and “witness target”.
A demonstration experiment of the NRF-CT imaging by using LCS gamma-ray beam has been carried out at the LCS gamma-ray beamline, BL1U, at UVSOR-III where 5.4 MeV LCS gamma-rays with a flux of 1×107 photons/s can be available. In 2018, we upgraded the energy of LCS gamma-rays up to 5.5 MeV and about 10 times higher flux by replacing the IR fiber laser.
By using NRF absorption method a NRF-CT image has been taken for a sample target consists of aluminum, stainless steel, and lead rods. The NRF signals from the witness target (natural lead) were measured by a Ge detector. At the same time, transmission gamma-rays have been measured by a LaBr3(Ce) detector which gives a density distribution of the sample target. The segmented CT reconstruction method has been developed and we obtained clear 208Pb distribution.
After the upgrade of the UVSOR-III BL01 LCS beamline, we have been trying to take a real isotope image by using enriched targets, 206Pb and 208Pb. The experiment has been performed and the isotope CT image reconstruction is under processing. To obtain a high resolution image and 3D CT have also been planned.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
計画通り、ファイバーレーザー等の整備を完了し、ガンマ線発生とその測定を年度内に終了した。
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| Strategy for Future Research Activity |
同位体を用いた2次元CT画像の取得を次年度までに終了し、1mmの高空間分解能を目指す。更に3次元画像の取得と本手法の確立、更には実用に向けた課題抽出を最終年度に行う。
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