Radionuclides Assessment for the Romanian Black Sea Shelf

Chirosca, Gianina; Mihailov, Maria-Emanuela; Ţugulan, Cornel Liviu; Chirosca, Alecsandru

doi:10.1007/978-3-319-57577-3_13

Cited by 2 publications

(2 citation statements)

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“…Its input into the Black Sea is due to atmospheric fallout and river runoff [6]. A number of works [6][7][8][9][10][11][12][13] are devoted to the study of the spatiotemporal variability of its content in the Black Sea region water and bottom sediments. This radionuclide is widely used to obtain the sedimentation rate quantitative estimates [12,[14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Potassium-40 ( 40 K) is a radionuclide of natural origin with a half-life of 1.25•10 9 years. Much attention is also paid to the study of this radionuclide [11,12,16,17]. The concentration of 40 K in the sinking particles of lithogenic origin is approximately one order of magnitude higher than that of biogenic particles [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Distribution of 137Cs and 40K in the Bottom Sediments of the Balaklava Bay (the Black Sea)

Kremenchutskii¹,

Gurov²

2021

PhO

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Purpose. The aim of the work is to study spatial variability of the 137Cs and 40K concentrations in the bottom sediments of the Balaklava Bay, and to estimate the sedimentation rate and relative content of the biogenic fraction. Methods and Results. The results of the 137Cs and 40K concentration measurements in 5 columns of the bottom sediments sampled in various parts of the Balaklava Bay are represented. Activity of 137Cs and 40K in the samples was determined by the gamma spectrometric analysis. Based on the measurement data, spatial variability of the 137Cs and 40K concentration fields in the bottom sediments was studied, and the sedimentation rate was quantitatively estimated. Application of the balance equation provided quantitative estimates of the relative biogenic fraction content; its spatial variability was described. Quantitative estimates of the relationship between the biogenic fraction estimates resulted from use of the direct and indirect methods are represented. Conclusions. According to the obtained results, the 137Cs and 40K concentrations in the upper 5 cm layer of bottom sediments varied in space from 11 to 62 and from 155 to 562 Bq/kg, respectively. The maximum radionuclide concentrations were characteristic of the northern part of the bay, the minimum ones – of its southern part. The sedimentation average rate was 0.51 ± 0.06 cm/year. Relative biogenic fraction content in the sediments varied in space from 30 to 89% and averaged 46 ± 25%. The maximum values were observed in the southern part of the bay, the minimum ones – in the northern part.

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