Kam Erol, Yarar Yasemin, Bozkurt Ahmet
TAEK, Cekmece Nuclear Research and Training Centre, Altinsehir Yolu, 5. km, Halkali, 34303 Istanbul, Turkey.
Radiat Prot Dosimetry. 2010 Jan;138(1):40-4. doi: 10.1093/rpd/ncp178. Epub 2009 Sep 18.
The level of background radiation for Tekirdag province of north-western Turkey was assessed in this study. Radon concentrations in indoor air were determined using CR-39 nuclear track detectors and the average (222)Rn activity was found to be 86 Bq m(-3) (equivalent to an annual effective dose of 2.2 mSv). Measurements of gamma doses in air were performed using plastic scintillators and the average absorbed gamma dose rates for indoor and outdoor were found to be 5.7 and 5 microR h(-1), respectively, corresponding to an annual effective dose of 300 microSv. The radionuclide activity concentrations in soil samples collected from the study area were measured through gamma-ray spectrometry and the average activities were determined as 29, 39 and 580 Bq kg(-1) for the natural radionuclides (238)U, (232)Th and (40)K, respectively, and 5.2 Bq kg(-1) for the fission product (137)Cs. The natural radioactivity sources resulted in an annual effective dose of 75 microSv. The radioactivity levels of drinking water samples were measured as 0.044 and 0.1 Bq l(-1) for gross alpha and gross beta activities using a low-background counting technique (equivalent to an annual effective dose of 9 microSv). The results of this study showed that the region's background radioactivity level is in agreement with most Turkish cities.
本研究评估了土耳其西北部泰基尔达省的背景辐射水平。使用CR - 39核径迹探测器测定室内空气中的氡浓度，发现平均（222）Rn活度为86 Bq m(-3)（相当于年有效剂量2.2 mSv）。使用塑料闪烁体测量空气中的伽马剂量，发现室内和室外的平均吸收伽马剂量率分别为5.7和5微伦琴/小时，对应年有效剂量300微希沃特。通过伽马射线能谱法测量从研究区域采集的土壤样品中的放射性核素活度浓度，天然放射性核素（238）U、（232）Th和（40）K的平均活度分别确定为29、39和580 Bq kg(-1)，裂变产物（137）Cs的平均活度为5.2 Bq kg(-1)。天然放射性源导致的年有效剂量为75微希沃特。使用低本底计数技术测量饮用水样品的总α和总β活度，分别为0.044和0.1 Bq l(-1)（相当于年有效剂量9微希沃特）。本研究结果表明，该地区的背景放射性水平与土耳其大多数城市一致。
