塞浦路斯特罗多斯蛇绿岩杂岩中的天然放射性元素浓度
Natural radioelement concentration in the Troodos Ophiolite Complex of Cyprus
摘要：
利用高分辨率伽马射线光谱测定法确定塞浦路斯特罗多斯蛇绿岩复合体覆盖的整个区域中天然存在的钍（Th）、铀（U）和钾（K）元素的浓度。为此，共分析了有关区域表层土壤的59个样本和主要岩层的10个样本。测定了Th（范围为2.5 × 10 ^-3 ppm至2.0 ppm）、U（范围为8.1 × 10 ^-4 ppm至0.6 ppm）和K（范围为1.3 × 10 ^-4%至1.0%）的元素浓度。平均值（A.M +- S.D.）土壤中Th、U和K的含量分别为（0.24 ± 0.34）ppm、（0.10 ± 0.10）ppm和（0.21 ± 0.24）%;岩石中Th、U和K的含量分别为（0.52 ± 0.17）ppm、（0.17 ± 0.11）ppm和（0.49 ± 0.87）%。根据这些值，估计由于岩石风化过程中的漂白和淋溶，下面的表层土壤中的放射性（放射性元素）损失接近50%。测得的Th/U比值在2和4之间，而K/Th比值在1.5x10^3和3.0x10^4之间变化很大。
英文摘要：
High-resolution gamma-ray spectrometry was exploited to determine naturally occurring thorium (Th), uranium (U) and potassium (K) elemental concentrations in the whole area covered by the Troodos Ophiolite Complex of Cyprus. For that purpose, a total of 59 samples from surface soils and 10 from the main rock formations of the region of interest were analysed. Elemental concentrations were determined for Th (range from 2.5x10^-3 ppm to 2.0 ppm), U (from 8.1x10^-4 ppm to 0.6 ppm), and K (from 1.3x10^-4 % to 1.0 %). The average values (A.M +- S.D.) derived are (0.24 +- 0.34) ppm, (0.10 +- 0.10) ppm and (0.21 +- 0.24) %, for Th, U, and K, respectively, in the soils, and (0.52 +- 0.17) ppm, (0.17 +- 0.11) ppm and (0.49 +- 0.87) % in the rocks. From these values, a radioactivity (radioelement) loss of nearly 50% is estimated in the underlying surface soils due to bleaching and eluviation during weathering of the rocks. The measured Th/U ratio exhibits values between 2 and 4, whereas the K/Th ratio is highly variable ranging between 1.5x10^3 and 3.0x10^4.
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