Natural radioactivity levels of granites used in Turkey

Radiation Protection Dosimetry
E CetinY Orgün

Abstract

Thirty granite samples commonly used in Turkey were surveyed for natural radioactivity. Concentrations of natural radionuclides in all samples were determined by gamma-ray spectroscopy with hyper-pure germanium detector. The activity concentrations measured for (226)Ra and (232)Th ranged from 0.7±0.1 to 186±1 Bq kg(-1), and from 0.5±0.1 to 249±2 Bq kg(-1), respectively. The activity concentrations obtained for (40)K varied from minimum detectable activity (0.4 Bq kg(-1)) to 1935±11 Bq kg(-1). The radium equivalent activity (Ra(eq)), the absorbed dose rate (D), the external hazard index (H(ex)) and the annual effective dose equivalent were also calculated and compared with the international recommended values. Granite samples were also analysed mineralogically. It was observed that the presence of large amount orthoclase and radiogenic accessory minerals are the sources of high activity concentration levels.

References

Sep 6, 2003·Journal of Environmental Radioactivity·Michalis TzortzisGeorge Christodoulides
Sep 24, 2004·Journal of Environmental Radioactivity·Michalis Tzortzis, Haralabos Tsertos
Jun 1, 2005·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Y OrgünN Celebi
May 23, 2006·Journal of Environmental Radioactivity·S PavlidouM Vavelides
Sep 12, 2006·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Y OrgünZ Karacik
Mar 1, 2008·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·S TurhanK Sen
Aug 15, 2008·Radiation Protection Dosimetry·H Papaefthymiou

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