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Saga, Kaname; Ban, Yasutoshi
Solvent Extraction and Ion Exchange, 18 Pages, 2026/00
Times Cited Count：0 Percentile：0.00(Chemistry, Multidisciplinary)Saga, Kaname
JAEA-Review 2025-003, 23 Pages, 2025/05
JAEA-Review-2025-003.pdf:1.08MB
Diagnosis and treatment using radioisotopes (RI) in the medical field contribute to improving people's welfare. However, almost all medical RI distributed in Japan are imported from overseas. As a result, geopolitical influences and natural disasters lead to difficulties for importing them. Based on these backgrounds, in Japan, a specialized subcommittee on the production and utilization of medical radioisotopes was established within the Atomic Energy Commission, and in May 2022, it formulated the "Action Plan for Promotion of Production and Utilization of Medical Radioisotopes." Japan Atomic Energy Agency (JAEA) launched the NXR Development Center in FY2024 to separate and recycle valuable elements contained in high-level liquid waste (HLLW). The advantages of using HLLW are that it contains a wide variety of nuclides and in large quantities. Therefore, this report focused on the RI contained in HLLW and evaluated whether it can be supplied for medical use. Specifically, the target supply amount of Sr-90, the parent nuclide of Y-90 approved as a RI for medical use, and the amount of Sr-90 in HLLW were estimated. Based on the estimation, the feasibility of separating medical RI from HLLW in a reprocessing research facility was evaluated. As a result, the HLLW possibly contains an amount of RI equivalent to the domestic medical demand. Although it depends on the RI concentration in the HLLW, a small volume of HLLW, ranging from a few hundred milliliters to a few liters, could potentially produce an amount of medical RI equivalent to domestic demand. In addition, the equipment already installed in research facilities, such as NUCEF at JAEA, may be sufficient to produce the medical RI. It may be possible to meet domestic medical demand for Sr-90, as a source of Y-90, by processing a few hundred milliliters to a few liters of HLLW using an existing research facility.
Saga, Kaname
JAEA-Review 2024-038, 9 Pages, 2024/09
JAEA-Review-2024-038.pdf:0.88MB
The purpose of this report is understanding the elements and radio isotopes with highly useful based on the current trends in the industrial field. The survey was conducted from the viewpoint of the abundance of elements and radio isotopes contained and the demand in the industrial field, and the following survey results were obtained. The economic scale of radio isotopes in the industrial field (including radiation use) has been increasing in recent years in the manufacturing, medical, and agricultural sectors. On the other hand, the domestic production of the utilized radio isotope is still small, and some radio isotopes are entirely imported. Radio isotopes such as Sr-90, Mo-100, Cs-137, and Am-241 from spent fuel are suitable for industrial use because of their abundance in spent fuel and half-lives. As for the utilization of elements, the industrial use of platinum group elements and rare earth elements were explored because these elements are high industrial value and low domestic self-sufficiency. The platinum group elements were evaluated to have the potential to be supplied in a certain amount as a new domestic production source based on their abundance in spent fuel. On the other hand, for rare earth elements, which have also low self-sufficiency rate, the ratio of the amount that could be supplied from spent fuel compared to the current annual supply was evaluated to be less than 1%, and therefore, no effect could be expected. The domestic recycling rate of rare earth elements is low, and the provision of numerical simulation technology, which improves the recycling rate, could highly contribute to the industries. This technology makes it possible to calculate the optimal operating conditions for the separation process, such as the number of processing stages and processing speed, in accordance with the elements to be separated and used.
Tsukahara, Takehiko*; Saga, Kaname*; Suzuki, Hideya*; Matsumura, Tatsuro
Kurin Tekunoroji, 29(12), p.4 - 7, 2019/12
no abstracts in English
-isopropylacrylamide) with diglycolamide-typed ligandsSaga, Kaname*; Suzuki, Hideya; Matsumura, Tatsuro; Tsukahara, Takehiko*
Analytical Sciences, 35(4), p.461 - 464, 2019/04
Times Cited Count：5 Percentile：15.72(Chemistry, Analytical)The phase transition-based gelification phenomenon of poly--isopropylacrylamide (PNIPAAm) in aqueous solutions has a great potential in developing new waste-free extraction processes of metal ions. By using hydrophobic diglycolamide-typed ligands in gelification extraction, a one-step complete extraction of all the RE ions from a nitric acid solution was successfully realized.
Tsukahara, Takehiko*; Suzuki, Hideya*; Matsumura, Tatsuro; Saga, Kaname*
Bunri Gijutsu, 49(4), p.221 - 225, 2019/04
no abstracts in English
Saga, Kaname; Kawasaki, Tomohiro*; Ishii, Sho*; Ban, Yasutoshi
no journal, ,
no abstracts in English
Saga, Kaname; Kawasaki, Tomohiro*; Ishii, Sho*; Ban, Yasutoshi
no journal, ,
no abstracts in English
