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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Soil properties and distribution of radionuclides of selected soil profiles from Southern Costa Rica
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Soil properties and distribution of radionuclides of selected soil profiles from Southern Costa Rica

机译：哥斯达黎加南部某些土壤剖面的土壤性质和放射性核素分布

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摘要

In soil profiles from southern Costa Rica, physical and chemical soil properties as well as mineralogical characteristics were analyzed. The investigated sites differ in their geomorphologic situation and floristic composition. Radiometric characterizations of the soils were undertaken, to allow a closer view on soil genesis as well as transport and migration mechanisms. Both natural and artificial radionuclides were used. The soils were classified as Cambisols and Acrisols. The parent materials of the soils are tuffites and basalts. K-40 distribution shows a high spatial variability, U-238 inventories are generally very low and Ra-226 is rather homogenously distributed. The high excess lead values are caused by intensive precipitation in the region and the resulting high rates of Pb-210 deposition. Amphibole minerals in the upper soil horizons probably originate from recent volcanic ashes. The circumstances of these depositions are unknown and need further investigation.
机译：在哥斯达黎加南部的土壤剖面中，分析了土壤的物理和化学性质以及矿物学特征。被调查地点的地貌状况和植物区系不同。对土壤进行了放射学表征，以便更深入地了解土壤成因以及运输和迁移机制。天然和人工放射性核素均被使用。土壤被分类为Cambisols和Acrisols。土壤的母体是凝灰岩和玄武岩。 K-40分布显示出很高的空间变异性，U-238的库存通常非常少，而Ra-226的分布相当均匀。过量的铅值高是由于该地区的强降水和所导致的Pb-210高沉积率所致。土壤高层的闪石矿物可能来自最近的火山灰。这些沉积物的情况未知，需要进一步调查。

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