塞浦路斯特征地质岩石中天然放射性样品的Gamma-ray测量
Gamma-ray measurements of naturally occurring radioactive samples from Cyprus characteristic geological rocks
摘要：
利用高分辨率伽马射线光谱学，测量了塞浦路斯境内所有主要地质岩层中的地面伽马辐射。从每种岩石类型中收集土壤样品，密封在1升塑料Marinelli烧杯中，并在实验室中测量24小时。根据测得的伽马射线能谱，确定了Th-232（1.3至52.8 Bq/kg）、U-238（0.9至90.3 Bq/kg）和K-40（13至894 Bq/kg）的放射性浓度。提取的钍、铀和钾的元素浓度平均值分别为（2.8 +- 0.7）ppm、（1.3 +- 0.3）ppm和（0.6 +- 0.1）%。室外空气中的吸收剂量率计算为0.1-50 nGy/h，取决于地质特征，总平均值为（14.7 +- 7.3）nGy/h。假设占用系数为20%，则相应的户外每人有效剂量率估计为0.1至61.4微Sv/y。
英文摘要：
Using high-resolution gamma-ray spectroscopy, the terrestrial gamma radiation in all the predominant types of geological rock formations appearing in Cyprus was measured. Soil samples were collected from each rock type, sealed in 1-litre plastic Marinelli beakers, and measured in the laboratory for 24 hours each. From the measured gamma-ray spectra, activity concentrations were determined for Th-232 (range from 1.3 to 52.8 Bq/kg), U-238 (from 0.9 to 90.3 Bq/kg) and K-40 (from 13 to 894 Bq/kg). Elemental concentrations mean values of (2.8 +- 0.7) ppm, (1.3 +- 0.3) ppm and (0.6 +- 0.1) % were extracted, for thorium, uranium and potassium, respectively. Absorbed dose rates in air outdoors were calculated to be in the range of 0.1-50 nGy/h, depending on the geological features, with an overall mean value of (14.7 +- 7.3) nGy/h. The corresponding effective dose rates per person outdoors were estimated to be between 0.1 and 61.4 microSv/y, assuming a 20% occupancy factor.
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