Aykamis Ahmet S, Turhan Seref, Aysun Ugur F, Baykan Umut N, Kiliç Ahmet M
General Directorate of Mineral Research and Exploration, Adana, Turkey.
Radiat Prot Dosimetry. 2013 Nov;157(1):105-11. doi: 10.1093/rpd/nct110. Epub 2013 Apr 30.
It is very important to determine the levels of the natural radioactivity in construction materials and radon exhalation rate from these materials for assessing potential exposure risks for the residents. The present study deals with 22 different granite samples employed as decoration stones in constructions in Turkey. The natural radioactivity in granite samples was measured by gamma-ray spectrometry with an HPGe detector. The activity concentrations of (226)Ra, (232)Th and (40)K were found to be in the range of 10-187, 16-354 and 104-1630 Bq kg(-1), respectively. The radon surface exhalation rate and the radon mass exhalation rate estimated from the measured values of (226)Ra content and material properties varied from 1.3 to 24.8 Bq m(-2) h(-1) with a mean of 10.5±1.5 Bq m(-2) h(-1) and 0.03-0.64 Bq kg(-1) h(-1) with a mean of 0.27±0.04 Bq kg(-1) h(-1), respectively. Radon concentrations in the room caused from granite samples estimated using a mass balance equation varied from 23 to 461 Bq m(-3) with a mean of 196±27 Bq m(-3). Also the gamma index (Iγ), external indoor annual effective dose (Eγ) and annual effective dose due to the indoor radon exposure (ERn) were estimated as the average value of 1.1±0.1, 0.16±0.02 mSv and 5.0±0.7 mSv, respectively, for the granite samples.
确定建筑材料中的天然放射性水平以及这些材料的氡析出率对于评估居民的潜在暴露风险非常重要。本研究涉及在土耳其建筑中用作装饰石材的22种不同花岗岩样品。使用HPGe探测器通过伽马射线能谱法测量花岗岩样品中的天然放射性。发现镭-226、钍-232和钾-40的活度浓度分别在10 - 187、16 - 354和104 - 1630 Bq kg⁻¹范围内。根据镭-226含量的测量值和材料特性估算的氡表面析出率和氡质量析出率分别为1.3至24.8 Bq m⁻² h⁻¹，平均值为10.5±1.5 Bq m⁻² h⁻¹，以及0.03 - 0.64 Bq kg⁻¹ h⁻¹，平均值为0.27±0.04 Bq kg⁻¹ h⁻¹。使用质量平衡方程估算的由花岗岩样品导致的室内氡浓度在23至461 Bq m⁻³范围内，平均值为196±27 Bq m⁻³。此外，对于花岗岩样品，伽马指数（Iγ）、室内外照射年有效剂量（Eγ）和因室内氡暴露导致的年有效剂量（ERn）的估算平均值分别为1.1±0.1、0.16±0.02 mSv和5.0±0.7 mSv。
