Distribution of Np, Pu, and Am in Water, Suspended Matter, and Bottom Sediments of Peter the Great Bay

The content of 237 Np, 239,240 Pu, and 241 Am in seawater, suspended matter, and bottom sediment cores of the Ussuri and Amur Bays, sampled in July 2021 and August 2022, was analyzed. The activity concentrations of 237 Np, 239,240 Pu, and 241 Am in the water of Peter the Great Bay were determined fo...

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Bibliographic Details
Published in:Radiochemistry (New York, N.Y.) N.Y.), 2024-02, Vol.66 (1), p.115-123
Main Authors: Kuzmenkova, N. V., Petrov, V. G., Rozhkova, A. K., Tokar, E. A., Shi, K., Kalmykov, S. N., Hou, X.
Format: Article
Language:English
Subjects:
Americium isotopes
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Fallout
Isotope ratios
Nuclear Chemistry
Plutonium
Seawater
Sediments
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Summary:The content of 237 Np, 239,240 Pu, and 241 Am in seawater, suspended matter, and bottom sediment cores of the Ussuri and Amur Bays, sampled in July 2021 and August 2022, was analyzed. The activity concentrations of 237 Np, 239,240 Pu, and 241 Am in the water of Peter the Great Bay were determined for the first time and were found to be equal to (19–105) × 10 –3 , 2.0–5.3, and 24.1–33.5 mBq/m 3 , respectively. The activity concentrations as well as the 239 Pu/ 240 Pu isotope ratio (⁓0.18) in the bottom sediments definitely indicate that global fallout is the main source of plutonium in the investigated territory. The sedimentation rates were determined for the Amur Bay (in the Razdolnaya River estuary), 0.9 mm/year, and for the Ussuri Bay, 4.1 mm/year. Actinide transfer coefficients were determined for Peter the Great Bay in the system dissolved forms (including colloids)–suspended matter–bottom sediment.
ISSN:1066-3622
1608-3288
DOI:10.1134/S1066362224010156