title: Measurement of naturally occurring radionuclides in geothermal samples and assessment of radiological risks and radiation doses.
abstract: The analysis of (226)Ra, (232)Th and (40)K radionuclides has been carried out in geothermal water and residue samples collected from six wells of geothermal power plant and disposal site, using gamma-spectrometry system equipped with a high-purity germanium detector. The activity concentrations of nine geothermal water samples were found to be lower than minimum detectable activity (MDA) values. The activity concentration of the residue samples ranged from 40 ± 4 to 2694 ± 85 Bq kg(-1) for (226)Ra, 33 ± 4 to 2388 ± 85 Bq kg(-1) for (232)Th, and MDA value to 967 ± 30 Bq kg(-1) for (40)K. In the study, some radiological indexes were examined and found to be higher than the reference values for majority of the residue samples. The annual effective doses arising from some residue samples were calculated to be higher than the permitted dose rate for the public, i.e. 1 mSv y(-1).
authors.affiliation: Sarayköy Nuclear Research and Training Center, Istanbul Road 30 km., 06983 Saray, Ankara, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Parmaksiz
mesh_terms: D001417:Background Radiation; D002138:Calibration; D004781:Environmental Exposure; D005720:Gamma Rays; D005857:Germanium / Q000737:chemistry*; D006801:Humans; D011197:Potassium Radioisotopes / Q000032:analysis; D016016:Proportional Hazards Models; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000379:methods*; D011868:Radioisotopes / Q000032:analysis*; D011883:Radium / Q000032:analysis; D012016:Reference Values; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D013051:Spectrometry, Gamma; D013910:Thorium / Q000032:analysis; D014421:Turkey
chemical_list: D011197:Potassium Radioisotopes; D011868:Radioisotopes; D012990:Soil Pollutants, Radioactive; D005857:Germanium; D013910:Thorium; D011883:Radium