Survey Gamma Radiation Measurements in Commercially-used Natural Tiling Rocks in Iran

Authors: A.Abbasi, F.Mirekhtiary

Abstract:

The gamma radiation in samples of a variety of natural tiling rocks (granites) produced and imported in Iran use in the building industry was measured, employing high-resolution Gamma-ray spectroscopy. The rock samples were pulverized, sealed in 0.5 liter plastic Marinelli beakers, and measured in the laboratory with an accumulating time between 50000 and 80000 second each. From the measured Gamma-ray spectra, activity concentrations were determined for 232Th (range from 6.5 to 172.2 Bq kg-1), 238U (from 7.5 to 178.1 Bq kg-1 ),226Ra( from 3.8 to 94.2 Bq kg-1 ) 40K (from 556.9 to 1539.2 Bq kg-1). From the 29 samples measured in this study, “Nehbndan ( Berjand )" appears to present the highest concentrations for 232Th,“Big Red Flower (China) "for 238U , “ Khoram dareh" for 226 Ra and “ Peranshahr" for 40K , respectively.

Keywords: activity concentration, natural radioactivity, tilingrocks (granites)

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1331493

References:

[1] Florou, H., Kritidis, P., 1992. Gamma radiation measurements and dose rate in the costal areas of a volcanic island, Aegean Sea, Greece. Radiation Protection Dosimetry 45 (1/4), 277-279.
[2] Snelling, A., Wood morappe, J., 1998. Rapid Rocks Granites... they didn-t need millions of years of cooling. Creation Ex Nihilo 21(1), 37-39.
[3] Luigi Bruzzi, Maurizio Baroni, Renato Mele and Elisabetta Nanni.,1997. " Proposal for a method of certification of natural radioactivity in building materials". Journal of Radiol.Vol.17,No.2 , P.85-94.
[4] Thomas, J., Hulka, J., Salava, J., (1993). New houses with high radiation exposure levels. Proceedings of the International Conference on High Levels of Natural Radiation, Ramsar, 1990.
[5] Hamby, D. M., Tynybekov, A. K., 2002. Uranium, thorium and potassium in soils along the shore of lake Issyk-Kyol in the Kyrghyz Republic. Environmental Monitoring and Assessment 73, 101-108.
[6] EG&G ORTEC, 1999. GammaVision-32: Gamma-Ray Spectrum Analysis and MCA Emulator. Software User-s Manual (V5.1). EG&G ORTEC.
[7] Chiozzi, P., Pasquale, V., Verdoya, M., 2002. Naturally occurring radioactivity at the Alps-Apennines transition. Radiation Measurements 35, 147-154.
[8] Reference sheet IAEA-soil-6 ,1999. soil-375 ,2000 . 327 ,2001. RGU-1 ,1987. RGK-1,1987. RGTh-1,1987 "International Atomic Energy Agency". Analytical Quality Control Services, Wagramer Strasse 5,P.O.Box 100,1400.
[9] Tzortzis, M., Tsertos, H., Christofides, S., Christodoulides, G., 2002. Gamma-raymeasurements of naturally occurring radioactive samples from Cyprus characteristicgeological rocks. Preprint UCY-PHY-02/02 (physics/0212099).