Abstract

This study examined the characteristics of distribution in plants and soils of the naturally occurring (²²⁶Ra, ²³²Th, and ⁴⁰K) and artificially produced (¹³⁷Cs) radionuclides in the conditions of the dry and semi-dry steppes for Rostov Oblast. As the research objects, it involves samples of soils and plants collected in Tsimlyanskii, Volgodonskii, Dubovskii, Proletarskii, and Orlovskii districts of Rostov Oblast in expeditions during 2001–2019. The specific activity (concentration) of the radionuclides in the soil was measured using the gamma-ray spectrometry of radionuclide analysis. The artificially produced ¹³⁷Cs is unevenly distributed in the soil cover and vegetation of Rostov Oblast due to the specific fallout pattern after the Chernobyl disaster. The naturally occurring ²²⁶Ra and ²³²Th are comparable in their specific activity in the soils and herbage within the limits of the standard deviations (20–30%), which averages 21.2 Bq/kg and 24.8 Bq/kg for ²²⁶Ra and ²³²Th in plants and 22 Bq/kg and 27.1 Bq/kg for ²²⁶Ra and ²³²Th in soils. The concentration of ⁴⁰К is 149.4 Bq/kg and 468.5 Bq/kg in plants and soils, respectively; it is governed by distinctive features of solonetzic soils of the dry-steppe zone in Rostov Oblast. Series were created based on specific activity of radionuclides in the plants herbage: ⁴⁰K > ²²⁶Ra ≥ ²³²Th > ¹³⁷Cs.

中文翻译：

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罗斯托夫州土壤和草本植物中天然存在的放射性核素和人工产生的 137Cs 的比活度

摘要

本研究调查了罗斯托夫州干旱和半干旱草原条件下天然存在的（ ²²⁶ Ra、²³² Th 和⁴⁰ K）和人工产生的（¹³⁷ Cs）放射性核素在植物和土壤中的分布特征。作为研究对象，它涉及2001-2019年在罗斯托夫州Tsimlyanskii、Volgodonskii、Dubovskii、Proletarskii和Orlovskii区采集的土壤和植物样本。使用放射性核素分析的伽马射线能谱法测量土壤中放射性核素的比活度（浓度）。人工制造的¹³⁷由于切尔诺贝利灾难后特定的沉降模式，Cs 在罗斯托夫州的土壤覆盖和植被中分布不均匀。天然存在的²²⁶ Ra 和²³² Th 在土壤和牧草中的比活度在标准偏差 (20–30%) 的范围内具有可比性，226 Ra 和 232 Th 的平均分别为 21.2 Bq/kg 和^24.8 Bq ^/ kg在植物中，对于土壤中的²²⁶ Ra 和²³² Th ，分别为 22 Bq/kg 和 27.1 Bq/kg 。浓度⁴⁰К 在植物和土壤中分别为 149.4 Bq/kg 和 468.5 Bq/kg；它受罗斯托夫州干燥草原地带独有土壤特征的支配。系列是根据植物牧草中放射性核素的比活度创建的：⁴⁰ K > ²²⁶ Ra ≥ ²³² Th > ¹³⁷ Cs。