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Journal Articles

Estimation of temporal variation of discharged inventory of radioactive strontium $$^{90}$$Sr ($$^{89}$$Sr) from port of Fukushima Daiichi Nuclear Power Plant; Analysis of the temporal variation from the accident to March 2022 and evaluation of its impact on Fukushima coast and offshore areas

Machida, Masahiko; Iwata, Ayako; Yamada, Susumu; Otosaka, Shigeyoshi*; Kobayashi, Takuya; Funasaka, Hideyuki*; Morita, Takami*

Nihon Genshiryoku Gakkai Wabun Rombunshi (Internet), 22(4), p.119 - 139, 2023/11

https://doi.org/10.3327/taesj.J22.016

We estimate monthly discharged inventory of $$^{90}$$Sr from port of Fukushima Daiichi Nuclear Power Plant (1F) from Jun. 2013 to Mar. 2022 by using the Voronoi tessellation method inside the port, following the monitoring of $$^{90}$$Sr sea water radioactivity concentration inside the port. The results suggest that the closure of sea side impermeable wall is the most effective for the reduction of discharged one. In addition, the results roughly reveal the monthly discharged inventory required to observe visible enhancement of the sea radioactivity concentration from the background level in each area. Such outcome is significant for considering environmental impacts on the planned future releasing of the treated water accumulated in 1F site.

Journal Articles

Radioactive strontium measurement using ICP-MS following cascade preconcentration and separation system

Takagai, Yoshitaka*; Furukawa, Makoto*; Kameo, Yutaka; Matsueda, Makoto; Suzuki, Katsuhiko*

Bunseki Kagaku, 66(4), p.223 - 231, 2017/04

https://doi.org/10.2116/bunsekikagaku.66.223
 Times Cited Count：5 Percentile：18.78(Chemistry, Analytical)

no abstracts in English

Journal Articles

Radiation-damage resistance in phyllosilicate minerals from first principles and implications for radiocesium and strontium retention in soils

Sassi, M.*; Rosso, K. M.*; Okumura, Masahiko; Machida, Masahiko

Clays and Clay Minerals, 64(2), p.108 - 114, 2016/04

https://doi.org/10.1346/CCMN.2016.0640203
 Times Cited Count：6 Percentile：20.77(Chemistry, Physical)

no abstracts in English

Journal Articles

Determination of low-level radiostrontium, with emphasis on ${it in situ}$ pre-concentration of Sr from large volume of freshwater sample using Powdex resin

Tomita, Jumpei; Yamamoto, Masayoshi*; Nozaki, Teo; Tanimura, Yoshihiko*; Oishi, Tetsuya

Journal of Environmental Radioactivity, 146, p.88 - 93, 2015/08

https://doi.org/10.1016/j.jenvrad.2015.04.011
 Times Cited Count：12 Percentile：34.88(Environmental Sciences)

Journal Articles

Retardation factor of radioactive strontium in a Japanese sanday soil layer

Onuki, Toshihiko

Waste Management 87, Vol.3, p.213 - 217, 1987/00

no abstracts in English

Oral presentation

Evolution of surface concentrations of $$^{90}$$Sr and $$^{137}$$Cs through 2016 from the Fukushima Dai-ichi nuclear accident

Kenyon, J.*; Buesseler, K. O.*; Casacuberta, N.*; Castrillejo, M.*; Otosaka, Shigeyoshi; Drysdale, J.*; Pike, S.*; Juan Diaz, X.*

no journal, , 

This study attempts to reconcile the sources and relative inputs of $$^{90}$$Sr and $$^{137}$$Cs using the measured activities and their activity ratios of $$^{137}$$Cs/$$^{90}$$Sr off the coast of Japan. Pre-accident levels correlate with 1960's weapons testing fallout activity ratios of 1.6. Immediately following the accident, $$^{137}$$Cs/$$^{90}$$Sr ratios experienced a sharp increase before reaching an average of 39$$pm$$1. Data from 2011 to 2016 off the coast of Japan show that radionuclide concentrations since the accident have been decreasing, but are not yet comparable to pre-accident levels in the areas immediately surrounding FDNPP. Areas farther away from FNDPP show ratios closer to pre-accident waters, giving insight to the transport and mixing of water off the coast of FDNPP. We observe that the release of radionuclides from FDNPP is ongoing, but at rates more than one thousand times lower than initial releases in 2011.

Oral presentation

Study on the analysis method for radioactive strontium in environmental samples by ICP-MS with online solid phase extraction

Yanagisawa, Kayo*; Kuwata, Haruka*; Hagiwara, Hiroki; Uezu, Yasuhiro

no journal, , 

no abstracts in English

7 (Records 1-7 displayed on this page)
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