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Journal Articles

Iodine-129 in the Tokai Reprocessing Plant and the environment

Nakano, Masanao

Hoken Butsuri (Internet), 56(1), p.17 - 25, 2021/03

The Tokai Reprocessing Plant is the first reprocessing plant in Japan which started hot test in 1977, and had reprocessed 1140 tons of spent nuclear fuel by May 2007. The gaseous and liquid radioactive wastes has been discharged to the environment. Since iodine-129 ($$^{129}$$I) is one of the most important nuclides for environmental impact assessment. Therefore, $$^{129}$$I in the exhaust and effluent has been controlled, and a precise analysis method of $$^{129}$$I in the environmental samples was developed, and the concentration of 129I in the environment was investigated. This report presents an overview of these activities. Not limited to $$^{129}$$I on reprocessing facilities, it is essential for nuclear operators to reduce the amount released to the environment in the spirit of ALARA, and to continuously develop the further upgrading environmental monitoring methods and evaluation methods in order to foster a sense of safety and security among residents living in the vicinity of the facilities.

Journal Articles

Vertical distributions of Iodine-129 and iodide in the Chukchi Sea and Bering Sea

Miwa, Kazuji; Obata, Hajime*; Suzuki, Takashi

Journal of Nuclear Science and Technology, 57(5), p.537 - 545, 2020/05

 Times Cited Count:1 Percentile:23.13(Nuclear Science & Technology)

This study investigated the vertical distribution of Iodine-129 ($$^{129}$$I) which is mainly produced by European nuclear reprocessing plants in the Chukchi Sea and Bering Sea. $$^{129}$$I was found to be distributed almost uniformly in fallout level, and an increasing in $$^{129}$$I concentration levels caused by high $$^{129}$$I water inflow from the Atlantic Ocean was not observed. Additionally, we revealed the vertical distribution of iodide, one chemical form of iodine, from the Bering Shelf area to the Chukchi Sea for the first time. The increasing tendency of iodide near sea bottom was observed.

Journal Articles

Performance of the new iodine-129 beamline at JAERI-AMS

Suzuki, Takashi; Aramaki, Takafumi; Kitamura, Toshikatsu; Togawa, Orihiko

Nuclear Instruments and Methods in Physics Research B, 223-224(1-4), p.87 - 91, 2004/08

 Times Cited Count:13 Percentile:66.18(Instruments & Instrumentation)

At the Japan Atomic Energy Research Institute, an Accelerator Mass Spectrometer which was installed in Mutsu establishment has two independent beam lines. We verified the precision, the accuracy and the detection limit at this AMS iodine line. Acceptance test for $$^{129}$$I measurement was carried out on two consecutive days and the $$^{129}$$I/$$^{127}$$I ratios obtained during these two days were (7.497$$pm$$0.119) $$times$$10 $$^{-11}$$ and (7.209$$pm$$0.050) $$times$$10 $$^{-11}$$ , respectively and the relative standard deviations from the $$^{129}$$I/$$^{127}$$I averages per sample were 1.6 % and 0.7 %, respectively. Seawater samples were collected in the western North Pacific and off Rokkasho, Japan before the operation of a nuclear fuel reprocessing plant. Seawater samples preparation for $$^{129}$$I -AMS measurement was performed by an extraction method. This paper was summarized the performance of this AMS iodine line and measurement results of $$^{129}$$I/$$^{127}$$I ratio in seawater samples.

Journal Articles

Applicability of a model predicting iodine-129 profile in a silver nitrate silica-gel column for dissolver off-gas treatment of fuel reprocessing

Mineo, Hideaki; Goto, Minoru; Iizuka, Masaru*; Fujisaki, Susumu; Hagiya, Hiromichi*; Uchiyama, Gunzo

Separation Science and Technology, 38(9), p.1981 - 2001, 2003/05

 Times Cited Count:14 Percentile:55.14(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

A Simple model predicting iodine profile in a packed bed of silica-gel impregnated with silver nitrate

Mineo, Hideaki; Goto, Minoru; Iizuka, Masaru*; Fujisaki, Susumu; Uchiyama, Gunzo

Journal of Nuclear Science and Technology, 39(3), p.241 - 247, 2002/03

 Times Cited Count:19 Percentile:76.46(Nuclear Science & Technology)

no abstracts in English

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