Radionuclides in sediment as tracers for evolution of modern sedimentary processes in the Bohai Sea

Du, Juan; Wang, Zhen; Du, Jinzhou; Lin, Wen‐Wei; Lü, Bo; Qi, Yanjie; Gao, Hui; Wang, Yuning; Yao, Ziwei

doi:10.1016/j.rsma.2021.102061

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…Sediments constitute an important component of water ecosystems. The intensity of sedimentation, the thickness of the layer of sediments, and their granulometric and chemic composition depend on the geological structure of a given reception basin, the geomorphology of the terrain, morphometry (in the case of lakes), climatic conditions, and the whole range of processes which occur in the standing bodies of water themselves (Charles et al 1990;Du et al 2021;Kanhaiya et al 2018;Valette-Silver 1993). The accumulation of heavy metals, highly toxic organic substances, and other instances of pollution in sediments contributes, on the one hand, to the self-purification of the water environment, and, on the other hand, they are a constant source of the secondary pollution of standing bodies of water (Grba et al 2017, Last and Smol 2001, Nõges et al 1999, Sandor et al 2001.…”

Section: Introductionmentioning

confidence: 99%

Sedimentary conditions based on the vertical distribution of radionuclides in small dystrophic lakes: a case study of Toporowe Stawy Lakes (Tatra Mountains, Poland)

Szarłowicz

Stobiński

Jędrzejek

et al. 2022

Environ Sci Pollut Res

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The aim of this work was to prove the use of radionuclides deposited in sediment core taken from an overgrowing dystrophic lakes surrounded by marsh-peat vegetation to estimate sedimentary conditions. Sediment core samples were taken from the Toporowe Stawy Lakes (Niżni (TSN) and Wyżni (TSW); Tatra Mountains). The sampling was done using a Limnos corer. After the physical sample preparations, gamma measurements were performed. Radiochemical analysis was applied with the aim of determining 210Pb radioactivity by means of 210Po. The mean values for TSN lake are as follows: 137Cs ~ 123 Bq∙kg−1, 40 K ~ 389 Bq∙kg−1, 228Th ~ 55 Bq∙kg−1, 226Ra ~ 86 Bq∙kg−1, 241Am ~ 5 Bq∙kg−1, and 210Pbuns ~ 180 Bq∙kg−1. For TSW lake, the radioactivity levels of 226Ra and 241Am are comparable to the TSN. The mean values of 137Cs, 40 K, and 228Th are almost twice as high as in TSN. The level of 210Pb in uppermost layer of TSN is higher than in TSW. Sediments were dated by use of 210Pb method, and the rate of sedimentation of each layer was also estimated. Basic chemometric tools were used to confirm the way of deposition of radionuclide, find the correlations between variables, and compare analyzed lakes. It was concluded that the presented type of lakes are a valuable source of information and the vertical distribution of radionuclide can be used to interpret the source of material supply and factors that influence the sedimentation process in recent 150–200 years.

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Section: Introductionmentioning

confidence: 99%

Sedimentary conditions based on the vertical distribution of radionuclides in small dystrophic lakes: a case study of Toporowe Stawy Lakes (Tatra Mountains, Poland)

Szarłowicz

Stobiński

Jędrzejek

et al. 2022

Environ Sci Pollut Res

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“…K,226 Ra, and232 Th with ne sediments and clay mineral were studied(Yang et al, 2013;Du et al, 2021).ConclusionRadioactivity concentrations of40 K, 232 Th, and 226 Ra in 11 sediment cores were above the global average. The AUI, Iγr, and AGDE indices were above recommended levels, while the Raeq, ADR, AEDE, and Hex indices were below recommended levels.…”

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confidence: 96%

Radioactivity concentration and risk indices in intertidal sediments of the Red River Delta, Vietnam

Van Vuong,

Hai,

Van Chien

et al. 2024

Environ Earth Sci

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The radioactivity concentration in eleven intertidal sediment cores in the Red River Delta was determined 40 K, 232 Th, and 226 Ra as well as radiological hazard indices for environmental risk assessment.The radioactivity concentrations of 40 K, 232 Th, and 226 Ra were 656 Bq/kg, 49.8 Bq/kg, and 37.0 Bq/kg, respectively. The radium equivalent activity (Raeq) was 158.7 Bq/kg; the absorbed dose rate (ADR) was 74.5 nGy/h; the annual effective dose equivalent (AEDE) was 0.09 mSv/y; the representative gamma index (Iγr) was 1.18; the activity utilization index (AUI) was 1.0; the external hazard index (Hex) was 0.40; the annual gonadal dose equivalent (AGDE) was 496.4 µSv/y. Two sediment groups were split. Group 1 with lower the radioactivity concentrations than Group 2, 40 K and 232 Th were above the global average while 226 Ra was below, Iγr and AGDE were above UNSCEAR's recommended levels. Group 2 radioactivity concentrations of 40 K, 226 Ra, and 232 Th were higher than global average; radiological hazard indices were higher than Group 1; the AUI, Iγr, and AGDE indices were above UNSCEAR's recommended level.The radioactivity concentrations of 40 K, 232 Th, and 226 Ra were above global average. The AUI, Iγr and AGDE indices were above UNSCEAR's recommended levels. It is recommended that coastal sediments should not be used for construction purposes as this can affect organisms in intertidal areas.

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Radioactivity mapping of beach sand by mobile in situ gamma-ray spectrometry

Patiris,

Tsabaris,

Maramathas

et al. 2024

HNPS Adv Nucl Phys

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A new method for prompt radioactivity mapping of beach sand is under development. It is based on mobile in situ gamma-ray spectrometry exploiting low- and medium-resolution portable scintillator systems. Two case study applications are presented which took place during IAEA’s RER1020 and CRP F22074 projects, aiming to determine the main methodological features, capabilities, and limitations of the new method. In general, spectra of very short acquisition time (20s) are obtained by a mobile unit (man or vehicle) along transects on the beach sand. The statistic of each spectrum is extremely low for individual analysis however, the spatial resolution of each measurement is preserved high (a few meters). The distribution of the total counting rate is used to classify the spectra, according to quartiles, into four classes (high, low, medium-high, and medium-low). For each class, the spectra are combined into one of a total acquisition time high enough for spectrometric analyses. Laboratory HPGe measurements and simulation studies were used to calculate the efficiency of selected photo-peak energies. The first maps obtained by the mobile method are in very good agreement with those obtained by grid sampling and laboratory analyses. Critical aspects under further investigation regard the varied physical parameters of the beach sand (density, water content, porosity) and the complicated detection geometry both of them strongly related to the detection efficiency.

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Radionuclides in sediment as tracers for evolution of modern sedimentary processes in the Bohai Sea

Cited by 4 publications

References 25 publications

Sedimentary conditions based on the vertical distribution of radionuclides in small dystrophic lakes: a case study of Toporowe Stawy Lakes (Tatra Mountains, Poland)

Sedimentary conditions based on the vertical distribution of radionuclides in small dystrophic lakes: a case study of Toporowe Stawy Lakes (Tatra Mountains, Poland)

Radioactivity concentration and risk indices in intertidal sediments of the Red River Delta, Vietnam

Radioactivity mapping of beach sand by mobile in situ gamma-ray spectrometry

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