Activity concentrations of selected artificial and natural radionuclides in water and sediment samples from the North Western Black Sea, 1999 (original) (raw)
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Journal of Radioanalytical and Nuclear Chemistry, 2006
Radionuclide (137 Cs, 238 U, 232 Th and 40 K) concentrations were determined in a sediment trap and bottom sediment samples collected from a station at the eastern Turkish coast of the Black Sea. The specific activity of the 137 Cs radionuclide in the settling particles ranged from 0.04±0.01 to 0.10±0.02 Bq. g-1 dry weight. The calculated flux rate of the 137 Cs was between 0.37 and 2.59 Bq. m-2. d-1 in the sampling periods of 2002 and 2003. The 137 Cs concentration in the bottom sediment profile were between 0.039±0.013-9.083±0.017 Bq. g-1 dry weight in the same station. The vertical profile of the radionuclides suggests that they have little mobility during the 17 years after the Chernobyl accident.
Anthropogenic radionuclides in seawater of the Far Eastern Seas
Science of The Total Environment, 1999
Large quantities of radioactive wastes have been dumped in the Far Eastern Seas by the former Soviet Union and the Russian Federation, and small amounts of radioactive wastes have been dumped by Japan and the Republic of Korea. In order to investigate the concentrations of anthropogenic radionuclides in the nine dumping areas, a second expedition was conducted in 1995 by Japan, the Republic of Korea, the Russian Federation and IAEA, following the first expedition in 1994. The results show that 137 Cs, 90 Sr and 239q240 Pu concentrations in surface and bottom waters at dumping areas do not significantly differ from the values observed in background areas, and from historical values. There is no clear effect of possible contamination due to radioactive waste dumping. The concentrations and water
Radionuclides Assessment for the Romanian Black Sea Shelf
2018
Radionuclides within the environment are not always a point of concern, in some cases they can be used to trace and identify incidents even long after they occurred. This reports performs a high resolution spectrometry analyses for several samples taken from the Black Sea containing seawater and sediments. The results give us the opportunity to use traceable radionuclides like 137Cs or 40K as tracers for the human activities within the western Black Sea area. Although the presence of such radioisotopes can be related to the Chernobyl event, results can be differentiated using other radioisotopes associated to the same event but having a specific timespan since them as the case for 241Am. Using such tracers one can isolate events from 30 years ago from the more recent ones.
Ten types of sea algae distributed along the Bulgarian coast have been collected and analyzed for radioactivity content in the period 1996 -2004. Results have shown that 37 Cs concentrations in all analyzed samples were relatively low (less than 10 Bq kg -1 dry weight) while the levels of naturally occurring radionuclides, such as 226 Ra and 2l0 Pb, were found to be higher in most samples; the highest observed value (896 Bq kg -1 dry weight for 226 Ra and 68 Bq kg -1 for 2l0 Pb was in the green Bryopsis plumosa alga. In addition, most alga species were also found to accumulate 2l0 Pb, which indicates their selectivity to this isotope. On the other hand, brown algae (Cystoseira barbata & crinita) have shown a clear selectivity for some nuclides, this selectivity may encourage their use as a biomonitor for pollution by nuclides. Moreover, the red alga species were found to contain the highest levels of Cs. The coastal areas far from rural settlings were chosen as control sites to eval...
Anthropogenic Radionuclides in the Caspian Sea
Water Resources - WATER RESOUR, 2003
Analysis and interpretation of the distribution of anthropogenic radionuclides 90Sr, 137Cs, and 239,240Pu in the Caspian Sea water are presented. These radionuclides are shown to be of environmental importance and to be useful for studying water mass dynamics.
Radiochimica Acta, 2018
Artificial and natural radionuclide pollutants of the marine environment have been recognized as a serious environmental concern. In this study, the activity concentrations of terrestrial and anthropogenic radionuclides in the soil and sediment samples collected from Bafra Kızılırmak Delta were measured by using gamma spectrometry with an NaI (Tl) detector. The average specific of activity concentrations for 238U, 232Th and 40K were found to be 28.59, 17.48 and 150.59 Bq kg−1, respectively. On the other hand, 137Cs was also measured in some samples. 137Cs (t1/2=30.17 years) is a man-made radionuclide released from nuclear fission and activation processes. It has a mean value of 5.32 Bq kg−1. From the activity concentrations, the radium equivalent activity (Raeq), the absorbed gamma dose rates (DR), the annual gonadal dose equivalent, annual effective dose equivalent, internal (Hin), external hazard index (Hex) and excess lifetime cancer risk were estimated. This study can be used as...
Radioprotection, 2020
The radionuclide activities were measured in sea sediment and coastal sand samples taken from the Black Sea to improve the understanding on coastal pollution as sediments and sand act as a sink for inorganic contaminants from various sources. The core sediments were taken from the Black Sea near to Varna city and sand samples were collected from in the Black Sea Coastal of North Anatolia. Their radionuclide contents were measured using a high resolution gamma-ray spectrometry. The activity results are found to be on the average, 65 ± 9 Bq · kg−1 for 210Pb, 13 ± 1 Bq · kg−1 for 137Cs, 36 ± 4 Bq · kg−1 for 226Ra, 25 ± 3 Bq · kg−1 for 232Th, and 403 ± 13 Bq · kg−1 for 40K in slices from the sediment core. The radionuclide activities in sand samples collected from the Black Sea coastal are measured for 7Be (2.4 ± 0.4 to 5.8 ± 0.4 Bq · kg−1) and for 137Cs (2.0 ± 0.1 to 3.7 ± 0.2 Bq · kg−1). In sand samples, other natural occurring radionuclides 226Ra (6.8 ± 1.1 to 12.5 ± 1.3 Bq · kg−1), ...
Proceedings of the Bulgarian Academy of Sciences
This paper presents data on the content of toxic elements (Mn, Ni, Zn, Cu, Pb, As, Cr, Cd and Co), technogenic (137Cs, 134Cs) and natural radionuclides of the 238U and 232Th series (234Th, 226Ra, 210Pb, 232Th) and 40K in sediments collected from ten sampling stations along the northern Bulgarian Black Sea coast for a period of more than twenty years. Measurements were made by Gamma Spectrometry and Inductively Coupled Plasma Mass Spectrometry. The results show that the nuclides and toxic elements concentration in sediments strongly depend on the sediments nature. The obtained data create a database on the concentrations of radionuclides and toxic elements in sediments from the Northern Bulgarian Black Sea coast and can be used for assessment of the ecological status of the marine environment along the whole northern coastal zone.