Dynamics of Background Radiation in Russian Seas (New Data on the Sea of Azov)

Matishov, Gennady G; Polshin, V. V.; Ilyin, G.V.; Usyagina, I. S.

doi:10.1134/s1028334x20080127

Cited by 3 publications

(2 citation statements)

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“…However, there are still sites with high 137 Cs specific activity (50-65 Bq/kg) in clay and aleurite-clay silts of the Central Sea of Azov at the depth of 10-13 m. The concentration of 137 Cs in the Taganrog Bay aleurite-clay silts is 20-45 Bq/kg. The change of the bottom ground lithotype to the sandy-silty aleurites in the Eastern Taganrog Bay condition the decrease of 137 Cs concentration to 11 Bq/kg [Matishov et al, 2020].…”

Section: Radionuclides In the Delta Bottom Sedimentsmentioning

confidence: 94%

“…Our previously obtained results on the specific activity of artificial radioisotopes in the Sea of Azov indicate that the granulometric composition of the bottom sediments is one of the most significant parameters controlling the level of radioactive contamination of aquatic ecosystem. The content of radionuclides in sea bottom sediments increased with the decrease in size of the particles of bottom ground and reached the maximum indices in clayish silts of the Central Sea of Azov [Matishov et al, 2020].…”

Section: Introductionmentioning

confidence: 95%

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Accumulation of Technogenic and Natural Radionuclides in the Don Delta Sediments

Matishov,

Ilyin,

Polshin

et al. 2024

Russian Journal of Earth Sciences

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The study of current sedimentation processes and radioactive contamination in the total area of the Don Delta is the research goal. The presented paper contains data analysis of radioecological and lithologic studies on bottom sediments, sampled in the northern part of the Don Delta in 2022. Based on the research results obtained, the authors provide the characteristics of the current conditions of sedimentation and specific activity of artificial and natural radionuclides in fluvial deposits, as well as indicate that similar in characteristics sandy-silty aleurites and sandy aleurite-clayish silts with inclusions of plant and shell detritus compose the bottom sediments of numerous braided channels. The authors determined the zonal accumulation character of both 137Cs technogenic and 226Ra, 40K, and 232Th natural radionuclides which conditions their accumulation and content increase from the lower delta to the upper delta areas. The velocity of currents in the braided channels (bayous) and related sedimentation conditions of suspended matter, as well as the lithotype of the bottom ground determine the indicated regularity. We assume that unlike 137Cs the distribution of natural radionuclides (40K, 226Ra, and 232Th) mainly depends on the mineral content of sediments entering the delta with the river runoff. Relatively low indices – on average ca. 9 Bq/kg of dry weight (d.w.) – characterise the current range of 137Cs radioisotope concentrations in the sediments of the Northern Don Delta. Such a level of specific activity is of no danger to the regional ecosystem.

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Section: Radionuclides In the Delta Bottom Sedimentsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 95%