We examine the geographical features in the distribution and the radiation parameters of radioactive rock dumps in the Elkon uranium ore area on the territory of South Yakutia. It is pointed out that the dumps under study are geomorphologically located on the Elkon horst which is a protrusion of crystalline basement rocks, towering over the territory of the Aldan highlands. It is found that most of these dumps lie within streambeds and in the bottoms of mountain rivers of the zone of hypergenesis and, geochemically, they are influenced by steep-slope topography, a cold humid climate and mountain-taiga vegetation dominating land cover. It is shown that these rock dumps were formed in the last third of the 20th century, during a large-scale and intense geological exploration for radioactive raw materials in this area. Radiation parameters of the dumps under study, such as the gamma radiation exposure dose, the content of 238U, 232Th and 40K, as well as the effective specific activity of these radionuclides were determined. It is found that the most active rock dumps, in their radiation parameters, approach radioactive ores. The dumps under study were ranked according to the degree of radiation danger to the population on the basis of the particular values of the gamma radiation exposure dose and effective specific activity of these radionuclides. It is established that the main source of radioactive contamination of soil and vegetation cover and the surface waters in the Elkon uranium ore area on the territory of South Yakutia are 40 rock dumps which are unevenly distributed in the total area of about 500 km 2 of the mountain-taiga permafrost landscapes. It is determined that more than half of these dumps, in their radiation parameters, are classified as hazardous and specially hazardous.

中文翻译：

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Elkon 铀矿区（南雅库特）的放射性岩石倾倒场

我们研究了位于南雅库特境内的 Elkon 铀矿区的放射性岩石堆场分布的地理特征和辐射参数。据指出，所研究的垃圾场在地貌上位于 Elkon horst，这是一个结晶基底岩石的突起，高耸于 Aldan 高地的领土上。研究发现，这些垃圾场大部分位于增生带的河床内和山地河流底部，从地球化学上讲，它们受到陡坡地形、寒冷潮湿气候和山地针叶林植被占主导地位的土地覆盖的影响。研究表明，这些石堆形成于 20 世纪后 3 年，在该地区对放射性原料进行大规模、密集的地质勘探期间。确定了所研究垃圾场的辐射参数，如伽马辐射暴露剂量、238U、232Th 和 40K 的含量以及这些放射性核素的有效比活度。发现最活跃的岩石堆场在其辐射参数方面接近放射性矿石。在这些放射性核素的伽马辐射照射剂量和有效比活度的特定值的基础上，根据对人口的辐射危险程度，对所研究的垃圾场进行排序。已确定南雅库特境内埃尔康铀矿区土壤和植被覆盖以及地表水的主要放射性污染源是 40 个岩石堆，它们分布不均，分布在约 500 km 2 的总面积中。山针叶林多年冻土景观。