塞浦路斯表层土壤中钍、铀和钾元素浓度的测定
Determination of thorium, uranium, and potassium elemental concentrations in surface soils in Cyprus
摘要：
进行了一项综合研究，利用高分辨率伽马射线光谱测定法确定塞浦路斯整个可进入地区表层土壤中钍、铀和钾元素的浓度。根据研究区的不同岩性单元，从岛上的基岩表面共采集了115个土壤样品。将土壤样品通过细网过筛，密封在1000 mL塑料Marinelli烧杯中，并在实验室中测量其伽马放射性，每次计数18小时。根据测量的伽马射线光谱，确定了钍（范围从2.5 × 10 ^-3到9.8 μ g g g-1）、铀（从8.1 × 10 ^-4到3.2 μ g g g-1）和钾（从1.3 × 10 ^-4到1.9%）的元素浓度。算术平均值（A.M. +- S.D.）算出（1.2 ± 1.7）微克/克，（0.6 +-0.7）μ g g-1，和钍、铀和钾分别为（0.4 +-0.3）%，比世界平均值7.4微克g-1（Th）低三至六倍，2.8 μ g g-1（U）和1.3%（K）来自全球所有可用数据。Th和K与U的浓度以及K与Th的浓度之间的最佳拟合关系基本上是线性的，相关系数分别为0.93、0.84和0.90。计算的Th/U、K/U和K/Th比值（斜率）分别为2.0、2.8 × 10 ~ 3和1.4 × 10 ~ 3。
英文摘要：
A comprehensive study was conducted to determine thorium, uranium and potassium elemental concentrations in surface soils throughout the accessible area of Cyprus using high-resolution gamma-ray spectrometry. A total of 115 soil samples was collected from all over the bedrock surface of the island based on the different lithological units of the study area. The soil samples were sieved through a fine mesh, sealed in 1000-mL plastic Marinelli beakers, and measured in the laboratory in terms of their gamma radioactivity for a counting time of 18 hours each. From the measured gamma-ray spectra, elemental concentrations were determined for thorium (range from 2.5x10^-3 to 9.8 micro g g-1), uranium (from 8.1x10^-4 to 3.2 micro g g-1) and potassium (from 1.3x10^-4 to 1.9 %). The Arithmetic mean values (A.M. +- S.D.) calculated are (1.2 +- 1.7) micro g g-1, (0.6 +- 0.7) micro g g-1, and (0.4 +- 0.3) %, for thorium, uranium and potassium, respectively, which are by a factor of three to six lower than the world average values of 7.4 micro g g-1 (Th), 2.8 micro g g-1 (U) and 1.3 % (K) derived from all data available worldwide. The best-fitting relation between the concentrations of Th and K versus U, and also of K versus Th, is essentially of linear type with a correlation coefficient of 0.93, 0.84, and 0.90, respectively. The Th/U, K/U, and K/Th ratios (slopes) calculated are equal to 2.0, 2.8x10^3,and 1.4x10^3, respectively.
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