Authors:
M. Yamamoto Low Level Radioactivity Laboratory, K-INET, Kanazawa University Tatsunokuchi 923-1224 Ishikawa Japan

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M. Hoshi Hiroshima University International Radiation Information Center, Research Institute for Radiation Biology and Medicine 734-5883 Hiroshima Japan

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J. Takada Hiroshima University International Radiation Information Center, Research Institute for Radiation Biology and Medicine 734-5883 Hiroshima Japan

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A. Sakaguchi Low Level Radioactivity Laboratory, K-INET, Kanazawa University Tatsunokuchi 923-1224 Ishikawa Japan

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K. Apsalikov Kazakh Scientific Research Institute for Radiation Medicine and Ecology Semipalatinsk The Kazakhstan Republic

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B. Gusev Kazakh Scientific Research Institute for Radiation Medicine and Ecology Semipalatinsk The Kazakhstan Republic

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Abstract  

Sediment core samples were collected up to a depth of 25–40 cm from three ponds (P. Korosteli, P. Mihairov and P. Alkat) and two lakes (L. Kanoneruka and L. Semanaika) located in widely separated regions outside the former Semipalatinsk Nuclear Test Site (SNTS) in Kazakhstan. The 137Cs, Pu and U concentrations with depth were determined in samples divided at 1 cm intervals from the top of each core. These sediment cores were dated by the excess 210Pb method. The reservoirs with low sedimentation rates of 0.038–0.41 g·cm–2·y–1 permitted, but not in detail, the estimation of the depositional history of close-in fallout of 137Cs and Pu within these regions. The sediments accumulating an anomalously high 238U concentration of 250–400 Bq/kg were also found for two of the five reservoirs, in which their 234U/238U and 235U/238U activity ratios were 1.3–2.0 and around 0.047 (nearly the same as that of natural U), respectively. Such U enrichment at the subsurface with a thin layer of lower-U sediment at the surface is mainly due to infiltration of lake water containing U from the ground water flowing into the lake or pond, followed by reduction of U(VI) to U(IV) at the redox boundary.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)