The Experts below are selected from a list of 6465 Experts worldwide ranked by ideXlab platform
Shun'ichi Hisamatsu - One of the best experts on this subject based on the ideXlab platform.
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Concentrations of iodine-129 in coastal surface sediments around spent Nuclear Fuel Reprocessing plant at Rokkasho, Japan, during and after its test operation
Journal of Radioanalytical and Nuclear Chemistry, 2019Co-Authors: Yuhi Satoh, Shinji Ueda, Hideki Kakiuchi, Yoshihito Ohtsuka, Shun'ichi HisamatsuAbstract:Concentrations of 129I in coastal surface sediment samples from the east coast of Aomori, Japan, 2–65 km away from the wastewater outlet of the Nuclear Fuel Reprocessing plant at Rokkasho, Japan, were measured from 2006 to 2010. No clear effect on 129I/127I atom ratios in marine sediments was observed, although 129I was discharged from the plant, during its test operation using actual spent Fuel, mainly between 2006 and 2008. The ratio in sediments collected at a fishing port at the mouth of a brackish lake increased in 2007, showing that the 129I migrated from the lake to the port.
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Inventory of 129 I in brackish lake sediments adjacent to a spent Nuclear Fuel Reprocessing plant in Japan
Journal of Radioanalytical and Nuclear Chemistry, 2018Co-Authors: Shinji Ueda, Hideki Kakiuchi, Shun'ichi HisamatsuAbstract:The 129I inventory in sediment of brackish lake, beside a Nuclear Fuel Reprocessing plant in Rokkasho, Japan, was clarified from 1997 to 2016. The 129I was discharged to the atmosphere and ocean during cutting and chemical processing the spent Fuel in the test operation from April 2006 to October 2008, although the plant is under final safety assessment as of May 2018. The 129I concentration and 129I/127I ratio in the surface sediment were 5–6 and 4–5 times higher than those in 1997, respectively. The 129I to a depth of 25 cm in the sediment increased until 2010–2012, then stabilized with accumulated state.
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concentration of 129i in aquatic biota collected from a lake adjacent to the spent Nuclear Fuel Reprocessing plant in rokkasho japan
Radiation Protection Dosimetry, 2015Co-Authors: Shinji Ueda, Hideki Kakiuchi, Hidenao Hasegawa, Hidehisa Kawamura, Shun'ichi HisamatsuAbstract:The spent Nuclear Fuel Reprocessing plant in Rokkasho, Japan, has been undergoing final testing since March 2006. During April 2006-October 2008, that spent Fuel was cut and chemically processed, the plant discharged (129)I into the atmosphere and coastal waters. To study (129)I behaviour in brackish Lake Obuchi, which is adjacent to the plant, (129)I concentrations in aquatic biota were measured by accelerator mass spectrometry. Owing to (129)I discharge from the plant, the (129)I concentration in the biota started to rise from the background concentration in 2006 and was high during 2007-08. The (129)I concentration has been rapidly decreasing after the Fuel cutting and chemically processing were finished. The (129)I concentration factors in the biota were higher than those reported by IAEA for marine organisms and similar to those reported for freshwater biota. The estimated annual committed effective dose due to ingestion of foods with the maximum (129)I concentration in the biota samples was 2.8 nSv y(-1).
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Iodine-129 in water samples collected adjacent to a spent Nuclear Fuel Reprocessing plant in Rokkasho, Japan
Journal of Radioanalytical and Nuclear Chemistry, 2014Co-Authors: Shinji Ueda, Hideki Kakiuchi, Hidenao Hasegawa, Naofumi Akata, Hidehisa Kawamura, Shun'ichi HisamatsuAbstract:The spent Nuclear Fuel Reprocessing plant in Rokkasho, Japan, has been undergoing final testing since March 2006. The concentrations of 129I in environmental water samples collected around the Reprocessing plant were measured from 2005 to 2012. The 129I concentrations in water samples of the brackish lake adjacent to a plant from 2006 to 2008 which the spent Fuel rods were cut and chemically processed, was higher than the background level. The major source of 129I in the lake was dominated by the direct deposition of 129I from the atmosphere than that from the ocean.
Shinji Ueda - One of the best experts on this subject based on the ideXlab platform.
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Sources of dissolved I-129 in brackish lake water during and after the operation of a spent Nuclear Fuel Reprocessing plant
Journal of Radioanalytical and Nuclear Chemistry, 2020Co-Authors: Yuhi Satoh, Shinji Ueda, Hideki Kakiuchi, Hasegawa Hidenao, Koichi AbeAbstract:The contribution of four sources (river water, seawater, atmospheric deposition, and dissolution from sediment) to the I-129 concentration in water of a brackish lake which is adjacent to a Nuclear Fuel Reprocessing plant in Northeast Japan was estimated using an observation dataset from 2006 to 2015, including the operation and non-operation terms of the plant (first three years: operation). The most major source of I-129 was the atmospheric deposition during and after the operation. However, the dissolution of sediment also became the significant source after the operation in summer because of the anoxic condition at the bottom of the lake.
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Concentrations of iodine-129 in coastal surface sediments around spent Nuclear Fuel Reprocessing plant at Rokkasho, Japan, during and after its test operation
Journal of Radioanalytical and Nuclear Chemistry, 2019Co-Authors: Yuhi Satoh, Shinji Ueda, Hideki Kakiuchi, Yoshihito Ohtsuka, Shun'ichi HisamatsuAbstract:Concentrations of 129I in coastal surface sediment samples from the east coast of Aomori, Japan, 2–65 km away from the wastewater outlet of the Nuclear Fuel Reprocessing plant at Rokkasho, Japan, were measured from 2006 to 2010. No clear effect on 129I/127I atom ratios in marine sediments was observed, although 129I was discharged from the plant, during its test operation using actual spent Fuel, mainly between 2006 and 2008. The ratio in sediments collected at a fishing port at the mouth of a brackish lake increased in 2007, showing that the 129I migrated from the lake to the port.
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Inventory of 129 I in brackish lake sediments adjacent to a spent Nuclear Fuel Reprocessing plant in Japan
Journal of Radioanalytical and Nuclear Chemistry, 2018Co-Authors: Shinji Ueda, Hideki Kakiuchi, Shun'ichi HisamatsuAbstract:The 129I inventory in sediment of brackish lake, beside a Nuclear Fuel Reprocessing plant in Rokkasho, Japan, was clarified from 1997 to 2016. The 129I was discharged to the atmosphere and ocean during cutting and chemical processing the spent Fuel in the test operation from April 2006 to October 2008, although the plant is under final safety assessment as of May 2018. The 129I concentration and 129I/127I ratio in the surface sediment were 5–6 and 4–5 times higher than those in 1997, respectively. The 129I to a depth of 25 cm in the sediment increased until 2010–2012, then stabilized with accumulated state.
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concentration of 129i in aquatic biota collected from a lake adjacent to the spent Nuclear Fuel Reprocessing plant in rokkasho japan
Radiation Protection Dosimetry, 2015Co-Authors: Shinji Ueda, Hideki Kakiuchi, Hidenao Hasegawa, Hidehisa Kawamura, Shun'ichi HisamatsuAbstract:The spent Nuclear Fuel Reprocessing plant in Rokkasho, Japan, has been undergoing final testing since March 2006. During April 2006-October 2008, that spent Fuel was cut and chemically processed, the plant discharged (129)I into the atmosphere and coastal waters. To study (129)I behaviour in brackish Lake Obuchi, which is adjacent to the plant, (129)I concentrations in aquatic biota were measured by accelerator mass spectrometry. Owing to (129)I discharge from the plant, the (129)I concentration in the biota started to rise from the background concentration in 2006 and was high during 2007-08. The (129)I concentration has been rapidly decreasing after the Fuel cutting and chemically processing were finished. The (129)I concentration factors in the biota were higher than those reported by IAEA for marine organisms and similar to those reported for freshwater biota. The estimated annual committed effective dose due to ingestion of foods with the maximum (129)I concentration in the biota samples was 2.8 nSv y(-1).
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Iodine-129 in water samples collected adjacent to a spent Nuclear Fuel Reprocessing plant in Rokkasho, Japan
Journal of Radioanalytical and Nuclear Chemistry, 2014Co-Authors: Shinji Ueda, Hideki Kakiuchi, Hidenao Hasegawa, Naofumi Akata, Hidehisa Kawamura, Shun'ichi HisamatsuAbstract:The spent Nuclear Fuel Reprocessing plant in Rokkasho, Japan, has been undergoing final testing since March 2006. The concentrations of 129I in environmental water samples collected around the Reprocessing plant were measured from 2005 to 2012. The 129I concentrations in water samples of the brackish lake adjacent to a plant from 2006 to 2008 which the spent Fuel rods were cut and chemically processed, was higher than the background level. The major source of 129I in the lake was dominated by the direct deposition of 129I from the atmosphere than that from the ocean.
Hideki Kakiuchi - One of the best experts on this subject based on the ideXlab platform.
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Sources of dissolved I-129 in brackish lake water during and after the operation of a spent Nuclear Fuel Reprocessing plant
Journal of Radioanalytical and Nuclear Chemistry, 2020Co-Authors: Yuhi Satoh, Shinji Ueda, Hideki Kakiuchi, Hasegawa Hidenao, Koichi AbeAbstract:The contribution of four sources (river water, seawater, atmospheric deposition, and dissolution from sediment) to the I-129 concentration in water of a brackish lake which is adjacent to a Nuclear Fuel Reprocessing plant in Northeast Japan was estimated using an observation dataset from 2006 to 2015, including the operation and non-operation terms of the plant (first three years: operation). The most major source of I-129 was the atmospheric deposition during and after the operation. However, the dissolution of sediment also became the significant source after the operation in summer because of the anoxic condition at the bottom of the lake.
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Concentrations of iodine-129 in coastal surface sediments around spent Nuclear Fuel Reprocessing plant at Rokkasho, Japan, during and after its test operation
Journal of Radioanalytical and Nuclear Chemistry, 2019Co-Authors: Yuhi Satoh, Shinji Ueda, Hideki Kakiuchi, Yoshihito Ohtsuka, Shun'ichi HisamatsuAbstract:Concentrations of 129I in coastal surface sediment samples from the east coast of Aomori, Japan, 2–65 km away from the wastewater outlet of the Nuclear Fuel Reprocessing plant at Rokkasho, Japan, were measured from 2006 to 2010. No clear effect on 129I/127I atom ratios in marine sediments was observed, although 129I was discharged from the plant, during its test operation using actual spent Fuel, mainly between 2006 and 2008. The ratio in sediments collected at a fishing port at the mouth of a brackish lake increased in 2007, showing that the 129I migrated from the lake to the port.
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Inventory of 129 I in brackish lake sediments adjacent to a spent Nuclear Fuel Reprocessing plant in Japan
Journal of Radioanalytical and Nuclear Chemistry, 2018Co-Authors: Shinji Ueda, Hideki Kakiuchi, Shun'ichi HisamatsuAbstract:The 129I inventory in sediment of brackish lake, beside a Nuclear Fuel Reprocessing plant in Rokkasho, Japan, was clarified from 1997 to 2016. The 129I was discharged to the atmosphere and ocean during cutting and chemical processing the spent Fuel in the test operation from April 2006 to October 2008, although the plant is under final safety assessment as of May 2018. The 129I concentration and 129I/127I ratio in the surface sediment were 5–6 and 4–5 times higher than those in 1997, respectively. The 129I to a depth of 25 cm in the sediment increased until 2010–2012, then stabilized with accumulated state.
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concentration of 129i in aquatic biota collected from a lake adjacent to the spent Nuclear Fuel Reprocessing plant in rokkasho japan
Radiation Protection Dosimetry, 2015Co-Authors: Shinji Ueda, Hideki Kakiuchi, Hidenao Hasegawa, Hidehisa Kawamura, Shun'ichi HisamatsuAbstract:The spent Nuclear Fuel Reprocessing plant in Rokkasho, Japan, has been undergoing final testing since March 2006. During April 2006-October 2008, that spent Fuel was cut and chemically processed, the plant discharged (129)I into the atmosphere and coastal waters. To study (129)I behaviour in brackish Lake Obuchi, which is adjacent to the plant, (129)I concentrations in aquatic biota were measured by accelerator mass spectrometry. Owing to (129)I discharge from the plant, the (129)I concentration in the biota started to rise from the background concentration in 2006 and was high during 2007-08. The (129)I concentration has been rapidly decreasing after the Fuel cutting and chemically processing were finished. The (129)I concentration factors in the biota were higher than those reported by IAEA for marine organisms and similar to those reported for freshwater biota. The estimated annual committed effective dose due to ingestion of foods with the maximum (129)I concentration in the biota samples was 2.8 nSv y(-1).
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Iodine-129 in water samples collected adjacent to a spent Nuclear Fuel Reprocessing plant in Rokkasho, Japan
Journal of Radioanalytical and Nuclear Chemistry, 2014Co-Authors: Shinji Ueda, Hideki Kakiuchi, Hidenao Hasegawa, Naofumi Akata, Hidehisa Kawamura, Shun'ichi HisamatsuAbstract:The spent Nuclear Fuel Reprocessing plant in Rokkasho, Japan, has been undergoing final testing since March 2006. The concentrations of 129I in environmental water samples collected around the Reprocessing plant were measured from 2005 to 2012. The 129I concentrations in water samples of the brackish lake adjacent to a plant from 2006 to 2008 which the spent Fuel rods were cut and chemically processed, was higher than the background level. The major source of 129I in the lake was dominated by the direct deposition of 129I from the atmosphere than that from the ocean.
C. M Wai - One of the best experts on this subject based on the ideXlab platform.
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Emerging separation techniques: supercritical fluid and ionic liquid extraction techniques for Nuclear Fuel Reprocessing and radioactive waste treatment
Advanced Separation Techniques for Nuclear Fuel Reprocessing and Radioactive Waste Treatment, 2011Co-Authors: C. M WaiAbstract:Abstract: Minimizing liquid waste generation in the Nuclear Fuel cycle is of great importance to the future of Nuclear energy. Separation techniques utilizing green solvents, supercritical fluid carbon dioxide and ionic liquids, for dissolution and extraction of uranium dioxide and fission products relevant to Nuclear waste management are described in this chapter. An industrial demonstration of the supercritical fluid technology for recovering enriched uranium from the incinerator ash produced by the light water reactor Fuel fabrication process by Areva NP in Richland, Washington is a good example of the new trend for treating Nuclear wastes. Prospects and advantages of these emerging green techniques for Nuclear Fuel Reprocessing and radioactive waste treatment are discussed.
Gregg J Lumetta - One of the best experts on this subject based on the ideXlab platform.
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advanced separation techniques for Nuclear Fuel Reprocessing and radioactive waste treatment
2011Co-Authors: Kenneth L Nash, Gregg J LumettaAbstract:Part 1 Fundamentals of radioactive materials separations processes: chemistry, engineering and safeguards: Chemistry of radioactive materials in the Nuclear Fuel cycle Physical and chemical properties of actinides in Nuclear Fuel Reprocessing Chemical engineering for advanced aqueous radioactive material separations Spectroscopic on-line monitoring for process control and safeguarding of radiochemical streams in Nuclear Fuel Reprocessing Safeguards technology for radioactive materials processing and Nuclear Fuel Reprocessing facilities. Part 2 Separation and extraction processes for Nuclear Fuel Reprocessing and radioactive waste treatment: Standard and advanced separation: PUREX processes for Nuclear Fuel Reprocessing Alternative separation and extraction: UREX+ processes for actinide and targeted fission product recovery Advanced Reprocessing for fission product separation and extraction Combined processes for high level radioactive waste separations: UNEX and other extraction processes. Part 3 Emerging and innovative techniques in Nuclear Fuel Reprocessing and radioactive waste treatment: Nuclear engineering for pyrochemical treatment of spent Nuclear Fuels Development of highly selective compounds and processes for solvent extraction of long-lived radionuclides from spent Nuclear Fuels Developments in the partitioning and transmutation of radioactive waste Solid-phase extraction technology for actinide and lanthanide separations in Nuclear Fuel Reprocessing Supercritical fluid and ionic liquid extraction techniques for Nuclear Fuel Reprocessing and radioactive waste treatment Development of biological treatment processes for the separation and recovery of radioactive wastes.
