Natural radioactivity and evaluation of effective dose equivalent of granites in Turkey.
Annual effective dose equivalent due to natural gamma radiation from (238)U, (232)Th and (40)K have been evaluated from granites in Turkey. Forty samples were taken for spectrometric analysis. Specific concentrations of (238)U, (232)Th and (40)K in granite samples were determined. Spectroscopy system was used with 1.8 keV (FWHM) coaxial high purity germanium (HPGe) detector. Average values of concentrations of (238)U, (232)Th and (40)K were detected at 15.85, 33.76 and 359 Bq kg(-1), respectively. The average value of radon varies from 0.073 to 0.185 Bq m(-2) h(-1) exhalation depends on the specific concentration of uranium. The dose rate due to this highest activity which have been evaluated by a Monte Carlo transport calculations does not exceed 0.4 mSv a(-1).
Osmanlioglu
Ahmet Erdal
AE
Turkish Atomic Energy Authority, Cekmece Nuclear Research and Training Center, P. K. 1 Ataturk Airport, 34149 Istanbul, Turkey. Erdal.Osmanlioglu@taek.gov.tr
D000396:Air Pollutants, Radioactive / Q000032:analysis*; D001417:Background Radiation; D011197:Potassium Radioisotopes / Q000032:analysis*; D012822:Silicon Dioxide / Q000032:analysis*; D013910:Thorium / Q000032:analysis*; D014421:Turkey; D014501:Uranium / Q000032:analysis*
D000396:Air Pollutants, Radioactive; D011197:Potassium Radioisotopes; C007886:granite; D014501:Uranium; D013910:Thorium; D012822:Silicon Dioxide