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Journal Articles

Frontiers of studies utilizing accelerator mass spectrometry in geoscience

Honda, Maki

Journal of the Mass Spectrometry Society of Japan, 70(4), p.282 - 283, 2022/12

The development of measurement and chemical separation techniques in the accelerator mass spectrometry (AMS) method has enabled highly sensitive analysis of $$^{244}$$Pu (half-life 8.1$$times$$10$$^{7}$$ years), $$^{60}$$Fe (half-life 2.62$$times$$10$$^{6}$$ years), and $$^{90}$$Sr (half-life 28.9 years) in AMS. For example, the study analyzing $$^{244}$$Pu in ferromanganese crust samples successfully quantified $$^{244}$$Pu from outside the solar system, which had been hidden by $$^{244}$$Pu from nuclear tests. Furthermore, the research has revealed that $$^{244}$$Pu is produced in neutron star mergers, etc., leading to unraveling the production sites where the heavy elements originate. This topic highlights the frontline of studies on $$^{244}$$Pu, $$^{60}$$Fe, and $$^{90}$$Sr utilizing AMS.

Journal Articles

Toxicity reduction with total volume control in nuclear waste

Fukaya, Yuji; Ueta, Shohei; Yamamoto, Tomohiko; Chikazawa, Yoshitaka; Yan, X.

Nuclear Technology, 208(2), p.335 - 346, 2022/02

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

When the total volume control on toxicity for nuclear waste management is applied, it becomes a limiting factor for the permittable total operation capacity of nuclear reactors. An alternative conceptual scenario to achieve the control is proposed that aims at toxicity reduction through Partitioning and Transmutation (P&T). Specifically, the electricity generation capacity could be inversely increased up with transmutation of $$^{90}$$Sr-$$^{137}$$Cs. Simultaneously, the cooling time before disposal is reduced to 50 years from the 300 years required by the existing scenarios such as (Accelerator Driven System (ADS). Finally, the scenario is also found feasible in terms of energy balance and cost by the neutron source of Li(d,xn) reaction with the deuteron accelerator for transmutation.

JAEA Reports

Contribution to risk reduction in decommissioning works by the elucidation of basic property of radioactive microparticles (Contract research); FY2018 Center of World Intelligence Project for Nuclear Science/Technology and Human Resource Development

Collaborative Laboratories for Advanced Decommissioning Science; Ibaraki University*

JAEA-Review 2019-041, 71 Pages, 2020/03


JAEA/CLADS, has been conducting the Center of World Intelligence Project for Nuclear Science/Technology and Human Resource Development (hereafter referred to "the Project") since FY2018. The Project aims at solving problems in nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. For this purpose, intelligence has been collected from all over the world, and basic research and human resource development have been promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. Among the adopted proposals in FY2018, this report summarizes the research results of the "Contribution to Risk Reduction in Decommissioning Works by the Elucidation of Basic Property of Radioactive Microparticles". In order to establish the decommissioning procedures (recovery of the melted fuels, decontamination inside the reactors, ensuring the safety of the workers, etc.) of the Fukushima Daiichi Nuclear Power Station, radioactive microparticles released by the accident are an important information source for clarifying what had happened inside the reactors in the course of the accident. The purpose of the present study is to obtain detailed knowledge on the basic properties (particle size, composition, electrical/optical properties, etc.) of the radioactive microparticles, as well as to further elucidate the various properties of the radioactive microparticles including the quantitative evaluation of alpha-ray-emitters, through the Japan-UK synergetic research. Thus, we are conducting research and development that will contribute to the comprehensive works towards the risk reduction in the "decommissioning" plan.

Journal Articles

IAEA'97 expedition to the NW Pacific Ocean; Results of oceanographic and radionuclide investigations of the water column

Povinec, P. P.*; Livingston, H. D.*; Shima, Shigeki*; Aoyama, Michio*; Gastaud, J.*; Goroncy, I.*; Hirose, Katsumi*; Huynh-Ngoc, L.*; Ikeuchi, Yoshihiro*; Ito, Toshimichi; et al.

Deep Sea Research Part 2: Topical Studies in Oceanography, 50(17-21), p.2607 - 2637, 2003/09

 Times Cited Count:97 Percentile:89(Oceanography)

An international sampling cruise, IAEA'97, was carried out in 1997 in the NW Pacif1c Ocean. The main results of this study are following: (1) The levels of oceanographic parameter showed differences from the historical data, (2) Transuranics water profiles showed typical sub-surface concentration maxima with decrease in concentration by about a factor of 4 from the historical results, deepening their positions by about a factor of 2 and declining the water column inventory by about 20% over 24 years, (3) Sr-90 and Cs-137 data confirmed that the observed changes in concentration profiles have been resulting from the regional water masses circulation, and (4) The concentrations of these radionuclides in surface water after 40 years of their main introduction to the NW Pacific are still showing a latitudinal dependence. The results present the most comprehensive recent study on the distribution of radionuclides in the NW Pacific Ocean with the implications for behaviour of these radionuclides in the water column and physical forcing of water mass circulation over the last 24 years.

Journal Articles

Anthropogenic radionuclides in the Japan Sea; Their distributions and transport processes

Ito, Toshimichi; Aramaki, Takafumi; Kitamura, Toshikatsu; Otosaka, Shigeyoshi; Suzuki, Takashi; Togawa, Orihiko; Kobayashi, Takuya; Senju, Tomoharu*; Chaykovskaya, E. L.*; Karasev, E. V.*; et al.

Journal of Environmental Radioactivity, 68(3), p.249 - 267, 2003/07

 Times Cited Count:39 Percentile:62.69(Environmental Sciences)

The anthropogenic radionuclides, $$^{90}$$Sr, $$^{137}$$Cs and $$^{239+240}$$Pu, in the seawater column of the Japan Sea were measured during 1997-2000. The vertical profiles of radionuclide concentrations showed their typical features; exponential decrease with depth for the $$^{90}$$Sr and $$^{137}$$Cs and surface minimum - subsurface maximum for the $$^{239+240}$$Pu, and there are no substantial differences between the present study and the previous ones. The area-averaged concentrations and the inventories of radionuclides in the Japan Sea are higher than those in the Northwest Pacific Ocean. In the spatial distributions, high inventory area extends and intrudes from the Japan Basin into the Yamato Basin. It is suggested that radionuclides sink by the vertical transport occurring mainly in the Japan Basin then advect into the Yamato Basin after detouring around the Yamato Rise, and finally, they are accumulated in the deep seawater of the Japan Sea.

Journal Articles

Dissolved forms of $$^{90}$$Sr, $$^{239+240}$$Pu and $$^{241}$$Am in the Sahan river waters from the Chernobyl area

Nagao, Seiya; Matsunaga, Takeshi; Fujitake, Nobuhide*; Amano, Hikaru

Proceedings of the International Workshop on Distribution and Speciation of Radionuclides in the Environment, p.162 - 168, 2000/00

no abstracts in English

Journal Articles

Migration behavior of Sr-90 and Cs-137 in a sand aquifer: Results of a 30-years experiment

Sakamoto, Yoshiaki; Nakamura, Haruto*; R.W.D.Killey*; D.R.Champ*

10th Pacific Basin Nuclear Conf. (10-PBNC), 2, p.1343 - 1350, 1996/00

no abstracts in English

Journal Articles

Measurements of thermal neutron capture cross sections and resonance integrals of long-lived fission product nuclei

Kato, Toshio*; Ogata, Yoshimune*; Harada, Hideo*; *; Sekine, Toshiaki;

Global 1995,Int. Conf. on Evaluation of Emerging Nuclear Fuel Cycle Systems, 2, p.1552 - 1559, 1995/00

no abstracts in English

Journal Articles

Development of migration prediction system(MIGSTEM) for cationic species of radionuclides through soil layers

Onuki, Toshihiko; Takebe, Shinichi; Yamamoto, Tadatoshi

Journal of Nuclear Science and Technology, 26(8), p.795 - 804, 1989/08

no abstracts in English

Oral presentation

Feasibility of $$^{90}$$Sr measurements using accelerator mass spectrometry

Honda, Maki; Martschini, M.*; Marchhart, O.*; Priller, A.*; Steier, P.*; Golser, R.*; Sakaguchi, Aya*; Sueki, Keisuke*

no journal, , 

no abstracts in English

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