Determination of radioactivity levels and hazards of soil and sediment samples in Fırtına Valley (Rize, Turkey) (original) (raw)
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Radiation Protection Dosimetry, 2014
In this study, the levels of the natural and artificial radioactivity in soil samples collected from surrounding of Karaman in Turkey were measured. Activity concentrations of the concerned radionuclides were determined by gamma-ray spectrometry using a high-purity germanium detector with a relative efficiency of 40 % at 1.332 MeV. The results obtained for the 238 U series ( 226 Ra, 214 Pb and 214 Bi), 232 Th series ( 228 Ac), 40 K and fission product 137 Cs are discussed. To evaluate the radiological hazard of radioactivity in samples, the radium equivalent activity (Ra eq ), the absorbed dose rate (D), the annual effective dose and the external (H ex ) and internal hazard index (H in ) were calculated and presented in comparison with the data collected from different areas in the world and Turkey.
Study of the radioactivity in environmental soil samples from Eastern Anatolia Region of Turkey
Radiochimica Acta, 2018
In this study, a detailed γ-ray spectrometer survey was performed to obtain the baseline data on natural and fallout radioactivity in soil samples (10–30 cm depth) collected from Iğdır which is a province in Eastern Anatolia Region of Turkey and located along the border with Armenia. Metsamor Nuclear Power Plant in Eastern Armenia is only about 20 km away from Iğdır province. The average activity concentrations of226Ra,232Th,40K and137Cs in the soil samples were found as 19.1±0.6 (range: 12.8–31.2 Bq kg−1), 21.9±0.6 (range: 11.6–36.8 Bq kg−1), 437.7±10.3 (range: 285.0–613.7 Bq kg−1) and 11.8±1.1 Bq kg−1, (range: 2.5–51.1 Bq kg−1), respectively. The radiological hazards caused by ionizing radiation emitted from these radionuclides on the population living in the region were assessed by estimating radiological parameters such as absorbed γ dose rate in outdoor and the corresponding annual effective dose rate from external exposure, annual effective dose rate from inhalation of radon a...
2018
The distribution of natural radioactivity in soils collected from uncultivated areas in Digor districts of Kars was investigated by using NaI(Tl) gamma-ray spectrometry. The concentration of the natural radio nuclides 226 Ra 232 Th, 40 K and 137 Cs in the 55 soil samples from the studied areas range from 21.6±7.0 to 55.7±8.2 Bqkg -1 , 45.0±14.7 to 94.7±15.3 Bqkg -1 , 474.5±0.0 to 666.5±9.2 Bqkg -1 and BDL to 13.3±1.5 Bqkg -1 , respectively. The determined mean values of activity concentrations of 226 Ra 232 Th and 40 K were used to calculate the radiation hazard indices in soil samples . In the studied area, the radium equivalent activity (Ra eq ) varied from 131.3 to 195.1 Bqkg -1 with the mean value of 171.5 Bqkg -1 and the open air absorbed gamma dose rate (ADR) varied from 61.7 to 88.0 nGyh -1 with the mean value of 79.0 nGyh -1 . The annual effective air dose rate (AED) due to the presence of radionuclides ranged between 75.7 and 107.9 µSv with the average value of 96.8 µSv. Th...
Natural radioactivity levels and related risk assessment in soil samples from Sakarya, Turkey
Journal of Radioanalytical and Nuclear Chemistry, 2017
An evaluation of the environmental radioactivity levels in soil samples from Sakarya province (Turkey) was undertaken in order to create a comprehensive radiological map of Sakarya. A total of 85 soil samples collected from different parts of the city were analysed using NaI(Tl) cray spectrometry. It was found that the mean activity concentrations of natural radionuclides 226 Ra, 232 Th and 40 K were 23.2 ± 2.5, 21.0 ± 3.4 and 371 ± 25.9 Bqkg-1 , respectively, all falling below the worldwide mean values. Accordingly, in order to assess the radiological risk, radium equivalent activity (Ra eq), absorbed gamma dose rate (D), annual effective dose equivalent (AED), and external hazard index (H ex) were estimated and found to have mean values of 30.93 nGyh-1 , 37.93 lSvy-1 , 64.14 Bqkg-1 and 0.18 Bqkg-1 , respectively. Also, the results were statistically analysed to make recommendations for further regulation.
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.
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...
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...
Radioactivity concentrations and dose assessment for soil samples around Adana, Turkey
Journal of Environmental Radioactivity, 2008
The concentrations of natural radionuclides in surface soils around Adana, Turkey were determined using gamma ray spectrometry with an HPGe detector. The natural gamma ray radioactivity of the terrestrial radionuclides in air was calculated throughout different areas of Adana. The average activity concentrations of 238 U, 232 Th and 40 K were found to be 17.6, 21.1 and 297.5 Bq kg À1 , respectively. Outdoor gamma dose measurements in air 1 m above ground level were determined by using a portable gamma scintillation detector. The gamma dose measurements in air were taken from the same places where soil samples were taken. Average outdoor gamma dose rates in sample stations were determined as 67 nGy h À1 . The annual effective dose to the public was found to be 82 mSv.
Journal of Radioanalytical and Nuclear Chemistry, 2012
This study is part of an effort to assess the level of background radiation for Erzincan Province of eastern Turkey. Radionuclide activity concentrations in soil samples were measured through gamma-ray spectrometry and the average activities were determined as 8. 93, 11.39, 281.94, and 9.52 Bq/kg for the radionuclides 238 U, 232 Th, 40 K, and 137 Cs, respectively. The average annual effective dose from these natural radioactivity sources ( 238 U series, 232 Th series and 40 K,) was calculated to be 27.9 lSv. Radioactivity levels in drinking and potable water samples were studied using a multi-channel low level proportional counter. The average gross alpha activity concentration was found to be 0.0477 Bq/L (min. 0.007 Bq/L; max. 0.421 Bq/L) and the average gross beta activity was measured as 0.104 Bq/L (min. 0.008 Bq/L; max. 1.806 Bq/L). These values lead to an average annual effective dose of 9.75 lSv from the alpha emitters and 56.34 lSv from the beta emitting radionuclides in water. The radioactivity levels in the water samples investigated were found to comply with the reference levels recommended by WHO and the regulations set forth by the Turkish Health Ministry.
ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, 2019
In this work, the activity concentrations of natural radionuclides 226 Ra, 232 Th, and 40 K in soil samples from Erbil Governorate, Iraqi Kurdistan were investigated by a gamma-spectroscopy system based on high-purity germanium detector. This is to assess the dose of radionuclides exposure to the population, knowing the health risks and to have a baseline for future changes in the environmental radioactivity. It was found that the activity concentrations of 226 Ra, 232 Th, and 40 K were ranged from 14.6 ± 1.6 to 38.2 ± 2.8 Bq/kg, 4.5 ± 1.4 to 52.4 ± 5.8 Bq/kg, and 302.8 ± 12.6 to 388.6 ± 12.8 Bq/kg, respectively. The measured activity concentrations for these radionuclides were compared with the reported data of other countries and with the worldwide average activity of soil. Radium equivalent activities, absorbed dose rate, excess lifetime cancer risk, and the values of hazard indices were calculated for the measured samples to assess the radiation hazard of the natural radioactivity in all samples to the people. It was concluded that the radium equivalent activities of the studied samples are below the internationally accepted values. These results show that annual effective dose absorbed through occupant from activity construction of soil samples used in the under place is below 1.0 mSv/y. It is concluded that the assessment radioactivity of soil is within acceptable levels and does not pose any health hazard to the population.