Natural radioactivity of riverbank sediments of the Maritza and Tundja Rivers in Turkey (original) (raw)
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Radioactivity in sediments and gross alpha–beta activities in surface water of Fırtına River, Turkey
Environmental Geology, 2008
The concentrations and distribution of natural and artificial radionuclides in sediment and water samples collected from Fırtına River in the Eastern Black Sea region of Turkey were investigated with an aim of evaluating the environmental radioactivity and radiation hazard. Natural gross a and gross b activities were determined for 21 different water samples, and the activity concentrations were obtained for 226 Ra, 214 Pb, 214 Bi, 228 Ac, 208 Tl, 40 K and 137 Cs in 20 different sediment samples. The obtained results showed that natural gross a and gross b activity concentrations in water samples range from 12.4 ± 3.4 to 66.2 ± 9.2 mBq l -1 and from 27.9 ± 3.3 to 133.3 ± 4.1 mBq l -1 , respectively. The mean activity concentrations were 32.6 ± 3.8 mBq l -1 for gross a and 69.9 ± 4.4 mBq l -1 for gross b. Generally, the gross b activities were higher than the corresponding gross a activities. The average concentrations of 238 U and 232 Th daughter products vary from 11 to 167 Bq kg -1 and from 16 to 107 Bq kg -1 , respectively. The concentrations of 40 K and 137 Cs vary from 51 to 1,605 Bq kg -1 and from 0.8 to 42 Bq kg -1 , respectively. Sediment characterization was also investigated using grain size, thin section and XRD analysis.
2013
Background: The radioacvity levels in sediment and rock samples of İkizdere and Kaptanpaşa Valley have been determined. To our knowledge, there seems to be no informaon about radioacvity level in the İkizdere and Kaptanpaşa Valley sediments and rocks so far. Materials and Methods: The average radium equivalent acvity (Ra eq), the total absorbed dose rate (D), the external risk index (H ex) and the annual effecve dose equivalent (AEDE) which will be defined later have been calculated and compared with the results in literature. Rock characterizaon was also invesgated using thin secon and X-ray diffracon (XRD) analysis. Also gross α and β acvity concentraons were calculated for some rock samples. Results: Their radiological implicaons were also calculated and compared with the internaonal recommended values. The gross α acvity is generally lower than the corresponding gross β acvity for some rock samples. Rock characterizaon was also invesgated using thin secon and XRD analysis. Concl...
2013
Background: The radioacvity levels in sediment and rock samples of Ikizdere and Kaptanpasa Valley have been determined. To our knowledge, there seems to be no informaon about radioacvity level in the Ikizdere and Kaptanpasa Valley sediments and rocks so far. Materials and Methods: The average radium equivalent acvity (Ra eq ), the total absorbed dose rate (D), the external risk index (H ex ) and the annual effecve dose equivalent (AEDE) which will be defined later have been calculated and compared with the results in literature. Rock characterizaon was also invesgated using thin secon and X-ray diffracon (XRD) analysis. Also gro ss α and β acvity concentraons were calculated for some rock samples. Results: Their radiological implicaons were also calculated and compared with the internaonal recommended values. The gross α acvit y is generally lower than the corresponding gross β acvity for some rock samples. Rock characterizaon was also invesgated using thin secon and XRD analysis. C...
Applied Radiation and Isotopes, 2007
The natural radioactivity levels in soil and sediment samples of Fırtına Valley have been determined. To our knowledge, there seems to be no information about radioactivity level in the Fırtına Valley soils and sediments so far. For this reason, soil and sediment samples were collected along the Fırtına Valley and analysis on the collected samples were carried out to determine 238 U, 232 Th, 40 K and 137 Cs radioisotopes using high purity germanium detector. The activity concentrations obtained for 226 Ra, 214 Pb, 214 Bi, 228 Ac, 208 Tl, 40 K and 137 Cs are given in the unit of Bq/kg. The results have been compared with other radioactivity measurements in different country's soils and sediments. The radium equivalent activity (Ra eq ), the absorbed dose rate (D), the external hazard index (H ex ), the annual gonadal dose equivalent (AGDE) and the annual effective dose equivalent (AEDE) were also calculated and compared with the international recommended values. r
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...
Determination of radioactivity concentration levels of Bakırçay River basin
2008
In this study, the activity concentrations of naturally occurring 40 K, 238 U, and 232 Th radionuclides and of the artificial, Chernobyl accident-induced 137 Cs radionuclide were measured in soil samples collected from Rize Province in the Black Sea region of Turkey. Rize is a city located in the Northeastern District of Turkey, which was significantly affected by the 1986 Chernobyl nuclear reactor accident in Ukraine, and the effects have continued to today. Tea is the main production plant of the region, and was contaminated by the artificial radioactivity. Therefore, measurements of residual 137 Cs contamination in soil are critical for monitoring the potential impacts on human health. The activity concentrations of radionuclides in 24 soil samples from the study area were measured by means of gamma spectrometry with a Nal(TI) detector. The activity concentrations in soil samples varied in the range of 7.4e79.8 Bq kg À1 for 238 U, 9.5e170.8 Bq kg À1 for 232 Th, 35.7e913.8 Bq kg À1 for 40 K, and 0.6 e154.3 Bq kg À1 for 137 Cs. The gamma absorbed dose rates in air were in the range of 10.7e156.4 nGy h À1 , with an arithmetic mean of 56.9 nGy h À1 , while the annual effective dose rates were determined to be in the range of 13.1e191.8 mSv y À1. The calculated values of external hazard index (H ex) for the soil samples in the study area were in the range of 0.12e0.94. The average value of radium equivalent activity was 125.0 Bq kg À1. The activity concentrations of radionuclides in soil samples were compared to the international values reported by United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR, 2000) and previous studies on the area.
Correlations of natural radionuclides in sediment from Danube
Journal of Geochemical Exploration, 2009
The correlation between specific activities of some natural radionuclides (238 U, 226 Ra, 232 Th, 40 K) measured in sediment taken from river bottom was studied. The sediment was taken from the Serbian part of the Danube River. Good correlation between some of the isotopes is observed, so that their specific activity ratios are spread over a lower range than specific activities themselves. This suggests that evaluation of specific activity ratios of some natural radionuclides could be a more sensitive method for the determination of increased levels of some of them than the straightforward analysis of specific activities.
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.