NATURAL RADIOACTIVITY LEVELS OF GRANITES USED IN TURKEY


Cetin E., Altinsoy N., Orgun Y.

RADIATION PROTECTION DOSIMETRY, vol.151, no.2, pp.299-305, 2012 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 151 Issue: 2
  • Publication Date: 2012
  • Doi Number: 10.1093/rpd/ncs007
  • Journal Name: RADIATION PROTECTION DOSIMETRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.299-305
  • Eskisehir Osmangazi University Affiliated: No

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 Ra-226 and Th-232 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 K-40 varied from minimum detectable activity (0.4 Bq kg(-1)) to 1935 +/- 11 Bq kg(-1). The radium equivalent activity (Ra-cq), 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.