Abstract —The paper considers the content and geochemical mobility of 226 Ra in surface waters, bottom sediments, and radioactively contaminated soils (podzolic and alluvial–soddy) of the northern taiga subzone in the area of former radium production site. It is established that the level or radioactive contamination and specific activity of geochemically mobile radium in the podzolic soil is higher, while its migration with surface waters is lower (0.03 Bq/L) than in the alluvial–soddy soil. The drainage waters of the latter are characterized by the maximum radium content (0.55 Bq/L), which is mainly concentrated in the suspended matter (98%) and humic acids (97%) fractions. In the river waters, radium is mainly accumulated in the suspended fraction and fulvic acid compounds. It is shown that under low-temperature and high-water current conditions and a weak sorption capacity of bottom material, the specific activity of the radioactive element in the riverine sediments in the zone of anthropogenic impact is higher than the average background value (0.3–1.8 against 0.2 mBq/g). Sedimentation of radionuclide in the geochemically mobile and weakly mobile species is most intense within contaminated sites. The radium content in the “carbonates”, “sesqui-oxides and -hydroxides” and, especially, “exchangeable” fractions extracted from soils was higher than in other fractions. A cumulative fraction of “water soluble”, “organic matter”, and “amorphous silicates” groups accounts for 0.4–3.7 and 1.6–7.4% of radionuclide content in the podzolic and alluvial–soddy soils, respectively, and was characterized by the predominance of “organic matter” fraction. The fraction of geochemically mobile radium is negatively correlated with its bulk specific activity ( r = –0.81), which is noted as trend for bottom sediments. The contribution of insoluble residue in the radionuclide specific activity was 23.5–95.5 and 7.8–69.4% in the podzolic and alluvial–soddy oils, respectively.

中文翻译：

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前镭生产基地陆生和水生北针叶林生态系统成分中镭 226 的形态形成

摘要——本文研究了前镭产地北部针叶林亚带地表水、底部沉积物和放射性污染土壤（灰化土和冲积土）中 226 Ra 的含量和地球化学迁移率。确定了灰化土壤中地球化学移动镭的水平或放射性污染和比活度较高，而其随地表水的迁移低于冲积 - 草皮土壤（0.03 Bq / L）。后者的排水水体中镭含量最高（0.55 Bq/L），主要集中在悬浮物（98%）和腐植酸（97%）部分。在河水中，镭主要积累在悬浮物和富里酸化合物中。结果表明，在低温高水流条件下，底物吸附能力弱，人为影响区河流沉积物中放射性元素比活度高于平均背景值（0.3~ 1.8 对 0.2 mBq/g）。地球化学移动和弱移动物种中放射性核素的沉积在污染场地内最为强烈。“碳酸盐”、“倍半氧化物和氢氧化物”，尤其是从土壤中提取的“可交换”部分中的镭含量高于其他部分。“水溶性”、“有机物”和“无定形硅酸盐”组的累积分数分别占灰化土和冲积土中放射性核素含量的 0.4-3.7% 和 1.6-7.4%，并以“有机物”部分占优势为特征。地球化学移动镭的比例与其总体比活度 (r = –0.81) 呈负相关，这被认为是底部沉积物的趋势。不溶残留物对放射性核素比活度的贡献分别为 23.5-95.5% 和 7.8-69.4%。