Ph.D. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: The objective of this study is to determine natural ((226)^Ra, (232)^Th, (40)^K) radioactivity levels and mass attenuation coefficients and to assess the radiological hazard from these sample of gas concrete, cement, sand, brick roofing tile, marble, lime and gypsum samples used as building materials in Turkey. Natural radionuclides ((226)^Ra, (232)^Th, (40)^K) in gas concrete, cement, sand, brick roofing tile, marble, lime and gypsum samples used as building materials in Turkey were measured by using gamma spectrometry. The average activity concentrations of (226)^Ra, (232)^Th and (40)^K were 82, 28 and 384 Bq/kg for gas concrete; 52, 40 and 324 Bq/kg for cement; 44, 26 and 441 Bq/kg for sand; 34, 34 and 462 Bq/kg for brick; 34, 33 and 429 Bq/kg for roofing tile; 23, 15 and 149 Bq/kg for marble; 38, 20 and 156 Bq/kg for lime and 17, 13 and 70 Bq/kg for gypsum, respectively. The measured activity concentrations for these radionuclides were compared with the reported data of other countries. The radium equivalent activities (Ra_(eq)), absorbed dose rates (D), annual effective dose rates (AED) as well as gamma (Iγ) and alpha (Iα) indices were calculated and compared with the recommended data. Moreover, the mass attenuation coefficients for these materials were determined experimentally and calculated theoretically. Experimental mass attenuation coefficient values were compared with theoretical values obtained by using XCOM. Also, chemical compositions and structural analysis of these samples were investigated.Keywords : Building materials, Radioactivity, Mass attenuation coefficients, Chemical analysis, XRD, Turkey.
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