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Journal Articles

Migration of atmospherically derived radionuclides in river systems; Findings from researches related to the Chernobyl accidents and nuclear weapon tests

Matsunaga, Takeshi; Tkachenko, Y.*

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 53(10), p.684 - 688, 2011/10

https://doi.org/10.3327/jaesjb.53.10_684

Features of radionuclides migration behavior in river systems have been summarized. Referred researches are those related to the global fallout due to weapon tests and the fallout due the Chernobyl accident. This summary aims to serve to provide basic findings on an occasion of the Fukushima nuclear accident. Migration of radionuclides in river systems is a persistent process including various time scale events. Differences by radionuclides appear clearly in their input fractions from the ground, and also in their long-range transport. For river systems' contamination, it is considered that countermeasures at stages of water treatment and aquatic food intake. Several decision support systems, which compare effectiveness and adverse effects of various countermeasures, must be very useful to examine that applicability comprehensively.

Journal Articles

Association of dissolved radionuclides released by the Chernobyl accident with colloidal materials in surface water

Matsunaga, Takeshi; Nagao, Seiya*; Ueno, Takashi; Takeda, Seiji; Amano, Hikaru; Tkachenko, Y.*

Applied Geochemistry, 19(10), p.1581 - 1599, 2004/10

https://doi.org/10.1016/j.apgeochem.2004.02.002
 Times Cited Count：35 Percentile：55.27(Geochemistry & Geophysics)

The association of dissolved $$^{90}$$Sr, $$^{239,240}$$Pu and $$^{241}$$Am with natural colloids was investigated in surface waters in the Chernobyl nuclear accident area by means of ultrafiltration. Results suggest that Pu and Am isotopes were preferentially associated with dissolved humic substances (HS) of high molecular size. A model calculation of the complexation of Pu and Am with HS also supported the above. This study has expanded our understanding of the general role of natural organic colloids in dictating the chemical form of actinides in the surface aquatic environment.

JAEA Reports

Environmental monitoring data around the Chernobyl Nuclear Power Plant used in the cooperative research project between JAERI and CHESCIR (Ukraine) (Cooperative research)

Ueno, Takashi; Matsunaga, Takeshi; Amano, Hikaru; Tkachenko, Y.*; Kovalyov, A.*; Sukhoruchkin, A.*; Derevets, V.*

JAERI-Data/Code 2002-024, 414 Pages, 2003/01

JAERI-Data-Code-2002-024.pdf:15.11MB

This report is a compilation of the shared data derived from the environmental monitoring by RADEK (The state Enterprise for Region Monitoring of Environment and Dosimetric Control of Ukraine) and the record of environmental characteristics derived from field observations during a research project (1992-1999) between JAERI (Japan Atomic Energy Research Institute) and CHESCIR (Chernobyl Science and Technology Centre for International Research). The compiled data in this report are especially related to one particular research subject (Subject-3) of the project on the migration of radionuclides released into the terrestrial and aquatic environments after a nuclear accident. The present report shows the basis of published works concerning Subject-3.

Journal Articles

Accumulation and potential dissolution of Chernobyl-derived radionuclides in river bottom sediments

Sanada, Yukihisa*; Matsunaga, Takeshi; Yanase, Nobuyuki; Nagao, Seiya; Amano, Hikaru; Takada, Hideshige*; Tkachenko, Y.*

Applied Radiation and Isotopes, 56(5), p.751 - 760, 2002/04

https://doi.org/10.1016/S0969-8043(01)00274-3
 Times Cited Count：14 Percentile：65.6(Chemistry, Inorganic & Nuclear)

Areas contaminated with radionuclides from the Chernobyl nuclear accident have been identified in Pripyat River near the Chernobyl Nuclear Power Plant. The bottom sediments contained $$^{137}$$Cs (10$$^{5}$$ - 10$$^{6}$$ Bq/m$$^{2}$$) within 0-30 cm depth, which is comparable to the ground soil of in the vicinity of the nuclear power plant (the Exclusion Zone). The sediments also accumulated $$^{90}$$Sr (10$$^{5}$$ Bq/m$$^{2}$$ ), $$^{239,240}$$Pu (10$$^{4}$$ Bq/m$$^{2}$$ ), $$^{241}$$Am (10$$^{4}$$ Bq/m$$^{2}$$ ) derived from the accident.The comparison of these inventories with those of the released radionuclides at the accident and the experimental analysis using the selective sequential extraction of the radionuclides in the sediments suggest that the potential mobility of $$^{137}$$Cs and $$^{239,240}$$Pu is low compared with $$^{90}$$Sr in the bottom sediment, while the potential dissolution of $$^{90}$$Sr from the river bottom sediment should be taken into account with respect to the long-term radiological influence on the aquatic environment.

Oral presentation

Environmental behavior of plutonium isotopes studied at the area of the Chernobyl accident; Transport, partitioning, influences

Matsunaga, Takeshi; Yanase, Nobuyuki; Sanada, Yukihisa; Nagao, Seiya*; Ueno, Takashi; Sato, Tsutomu*; Isobe, Hiroshi*; Amano, Hikaru; Tkachenko, Y.*

no journal, , 

no abstracts in English

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