Natural radioactivity measurement in pumice samples used raw materials in Turkey

Turhan S., Yucel H., Gunduz L., Sahin S., Vural M., Parmaksiz A., ...More

APPLIED RADIATION AND ISOTOPES, vol.65, no.3, pp.350-354, 2007 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 65 Issue: 3
  • Publication Date: 2007
  • Doi Number: 10.1016/j.apradiso.2006.09.006
  • Page Numbers: pp.350-354


The activity concentrations of Th-232, Ra-226, and K-40 in different pumice samples have been determined by high-resolution gamma-ray spectrometry using a 110% HpGe detector. The radium equivalent activities (Ra-eq), external hazard index (H-in), and internal hazard index (H-in) associated with the natural radionuclides and representative level index (I-yr) are calculated to assess the radiation hazard of the natural radioactivity in the pumice samples. The mean values of the measured radioactivity concentrations of Th-232, Ra-226, and K-40 for pumice samples from the region of lakes (ROL) are 232.4 +/- 8.0, 196.9 +/- 7.8, and 1325.8 +/- 20.4Bq kg(-1) and for pumice samples from Cukurova region (CR) 16.3 +/- 4.0, 16.1 +/- 4.9, and 479.7 +/- 170.4Bq kg(-1), respectively. The calculated Ra-eq values vary from 435.9 +/- 12.5 to 883.6 +/- 41.5 Bq kg(-1) with a mean of 630.9 +/- 20.2 Bq kg(-1) for the ROL samples and from 49.7 +/- 3.3 to 101.9 +/- 7.2 Bq kg(-1) with a mean of 76.3 +/- 23.7 Bq kg(-1) for the CR samples. For the ROL samples, Ra-eq are above the limit of 370 Bq kg(-1), equivalent to external gamma dose of 1.5 mSv yr(-1), recommended for the safe use of construction materials by NEA-OECD, while for the CR samples, Ra-eq values are lower than the limit. (c) 2006 Elsevier Ltd. All rights reserved.