Radioactivity in sediments and gross alpha–beta activities in surface water of Fırtına River, Turkey (original) (raw)
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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...
Natural radioactivity in various surface waters in Adana, Turkey
Desalination, 2010
Gross α and gross β activities of 30 different water samples collected from sea, lake, river and tap waters in Adana were determined. The instrumentation used to count the gross α and gross β activities was an α/β counter of the low background multiple detector type with 10 sample detectors (Berthold LB770). The average measurements were 0.0096 Bq/l, 0.086 Bq/l for gross alpha and gross beta, respectively in drinking water. The obtained results showed that, in general, natural activity concentrations of α and β emitting radionuclides in drinking water samples did not exceed WHO and ITS recommendations. To evaluate the annual effective dose equivalent of ingestion of these waters, a conservative dosimetric calculation was carried out using dose conversion factor suggested by the USA-EPA. Average annual dose of equivalent was calculated 0.005 mSv year − 1 .
Natural radioactivity in tap waters of Eastern Black Sea region of Turkey
Radiation Protection Dosimetry, 2005
In this study, the activity concentrations of some radionuclides in tap water samples of the Eastern Black Sea region of Turkey were measured. The activity concentrations of radionuclides 214 Pb, 214 Bi, 40 K, 226 Ra and 137 Cs were determined using high resolution gamma ray spectrometry. Furthermore, 222 Rn activity concentrations in tap water samples were measured using Liquid Scintillation Counting. The mean specific activities of 214 Pb, 214 Bi, 226 Ra, 40 K, 137 Cs and 222 Rn in tap water samples were 6.73, 6, 19.16, 168.57, 5.45 mBq l À1 and 10.82 Bq l À1 , respectively. These values are comparable with concentrations reported for other countries. The effective doses were determined due to intake of these radionuclides as a consequence of direct consumption of tap water samples. The estimated effective doses were 6.878 Â 10 À4 lSv y À1 for 214 Pb, 4.800 Â 10 À4 lSv y À1 for 214 Bi, 3.916 lSv y À1 for 226 Ra, 0.763 lSv y À1 for 40 K, 0.052 lSv y À1 for 137 Cs and 5.848 lSv y À1 for 222 Rn.
Evaluation of radioactive pollution in sediment samples of Borçka Dam Lake, Turkey
Cumhuriyet Science Journal, 2019
In this research, the concentrations of natural (226Ra, 232Th and 40K) and anthropogenic (137Cs) radionuclides were measured in sediment samples collected from the Borçka Dam Lake using a high purity germanium detector (HPGe). The activity values ranged from 4.79-21.46, 9.36-20.65, 238.01-721.26 and 0.79-6.81 Bq kg-1 for 226Ra, 232Th, 40K and 137Cs respectively. The average 226Ra, 232Th and 40K activity concentrations calculated for the sediment samples were found to be lower compared to world average values reported by UNSCEAR. In addition, radiological hazard indices were determined and compared with the international permissible values. The results of this study revealed that there is no significant health risk for people exposed to sediment samples in this region.
NATURAL RADIOACTIVITY IN VARIOUS SURFACE WATERS IN I . STANBUL, TURKEY
AbstractÐGross-a and gross-b, activities of eight well and ®ve tap water samples taken in I . stanbul were determined. Ra 226 , Rn 222 , Pb 214 , Bi 214 , K 40 , Cs 137 activity concentrations in four lake, four sea water, one snow and one rain water samples were also analyzed in order to determine their radioactivity. The results obtained showed that, in general, natural activities in drinking water samples did not exceed WHO and ITS guidelines. In sea and lake water, four samples were over WHO and TSI guidelines. Concentrations ranging from 0.007 to 0.04 Bq l À1 and from 0.02 to 0.1 Bq l À1 were observed for drinking water and the gross-a and gross-b activities, respectively. For all samples the gross-b activities were higher than the corresponding gross-a activities. In order to evaluate the annual eective dose equilavent of ingestion of these waters, a conservative dosimetric calculation was carried out using dose conversion factor suggested by the ICRP. An average annual eective dose equivalent of 0.84 mSv y À1 for Ra 226 was calculated. 7
Journal of Radioanalytical and Nuclear Chemistry, 2000
Radioactive concentrations of several artificial and natural radionuclides were determined in water and sediment samples collected from various locations in the NW Black Sea in December 1999. For water samples, 90 Sr and 137 Cs activity concentrations were of approximately 11 mBq/l and 26.3-41.2 mBq/l, respectively. The concentration of tritium ranged from 7 to 24 T.U. In sediment samples, maximum concentrations of 137 Cs, 239+240 Pu and 241 Am were found of 128±6 Bq . kg -1 , 1.8±0.1 Bq . kg -1 and 0.05±0.04 Bq . kg -1 , respectively. For U and Th radionuclides, the concentrations ranged from 20-80 Bq . kg -1 and 30-50 Bq . kg -1 , respectively. The results were consistent with those reported in earlier research for the Black Sea.
Concentrations of Environmental Radioactivity in Sediment Cores from Kulakcayiri Lake
Journal of the Turkish Chemical Society Section A: Chemistry, 2018
This study was carried out in order to calculate the concentrations of radioactivity in the natural Kulakcayırı Lake of Istanbul (Turkey). Three core samples were taken from Kulakcayırı Lake by drilling and taken from heights of 5-5.5 m, 10-10.5 m and 15-15.5 m at the same point and then moved to the laboratory. According to the laboratory results, the K-40 concentrations of the samples were 325 ± 18 Bq/kg, 353 ± 19 Bq/kg and 367 ± 19 Bq/kg, while their Th-232 concentrations were 38 ± 6 Bq/kg, 43 ± 6 Bq/kg and 42 ± 6 Bq/kg, respectively. Their concentrations of Ra-226 were calculated as 29 ± 5 Bq/kg, 26 ± 5 Bq/kg and 26 ± 5 Bq/kg, while the Cs-137 concentrations of the three samples were calculated as ≤MDA (Minimum Detectable Activity) and existed at very low concentrations. The average activities of K-40, Th-232, Ra-226 and Cs-137 were found to be 348 ± 186 Bq/kg, 41 ± 6.3 Bq/kg, 27 ± 5.1 and ≤MDA, respectively. The results were compared with those of similar studies. These finding...
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.