Sorption of Radionuclides on the Rock of the Yeniseisky Site in the Presence of Colloidal Particles of Bentonite from the Tagansky Deposit

IF 1 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Radiochemistry Pub Date : 2025-10-13 DOI:10.1134/S1066362225040150

M. R. Khabarova, A. A. Rodionova, A. S. Toropov, I. E. Vlasova, S. N. Kalmykov

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Abstract

The presence of colloids in groundwater can significantly complicate the behavior of radionuclides under the conditions of deep geological repository (DGR) of radioactive waste. To ensure the safety of radioactive waste disposal in the host rock environment, it is necessary to thoroughly study the properties of the colloids formed and determine their influence on the retention of radionuclides by crystalline rocks. This work investigates the influence of colloidal particles of bentonite from the Tagansky deposit on the sorption of ¹³⁷Cs, ⁹⁰Sr, ²⁴¹Am, ²³⁹Pu, and ²³⁷Np on samples of the host rock from the Yeniseisky site. Kinetic dependences were obtained, and the quantitative parameters of sorption of the above-listed radionuclides in a model groundwater solution on the colloidal fraction of bentonite from the Tagansky deposit and on intact rock samples were determined. A comparison of the sorption capacity of clay colloids and host rocks showed that the host rock makes a major contribution to the sorption of cesium and strontium, whereas plutonium and neptunium are predominantly retained by the colloidal fraction. The formation of even a small amount of colloidal material from engineered safety barrier materials influences the behavior of radionuclides under DGR conditions.

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塔甘斯基矿床膨润土胶体颗粒存在下叶尼泽斯基遗址岩石对放射性核素的吸附

地下水中胶体的存在使放射性核素在放射性废物深埋处置条件下的行为严重复杂化。为了确保放射性废物在寄主岩石环境中的安全处置，有必要深入研究结晶岩石形成的胶体的性质，并确定其对放射性核素保留的影响。本文研究了塔甘斯基矿膨润土胶体颗粒对叶尼泽斯基矿寄主岩石样品中137Cs、90Sr、241Am、239Pu和237Np吸附的影响。获得了上述放射性核素在模型地下水溶液中对塔甘斯基矿床膨润土胶体组分和完整岩石样品吸附的动力学依赖关系和定量参数。粘土胶体和寄主岩石的吸附能力比较表明，寄主岩石对铯和锶的吸附起主要作用，而钚和镎主要由胶体部分保留。工程安全屏障材料即使形成少量胶体物质也会影响放射性核素在DGR条件下的行为。

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来源期刊

Radiochemistry CHEMISTRY, INORGANIC & NUCLEAR-

CiteScore

1.30

自引率

33.30%

发文量

期刊介绍： Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.