| 研究分担者 |
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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| 研究実績の概要 |
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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