Sorption and Spatial Distribution of 137 Cs, 90 Sr and 241 Am on Mineral Phases of Fractured Rocks of Nizhnekansky Granitoid Massif

Anastasiya A. Rodionova, Vladimir G. Petrov (), Irina E. Vlasova, Konstantin B. Rozov, Iurii M. Nevolin, Vasiliy O. Yapaskurt, Vyacheslav G. Rumynin and Stepan N. Kalmykov
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Anastasiya A. Rodionova: Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1 bld. 3, 119991 Moscow, Russia
Vladimir G. Petrov: Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1 bld. 3, 119991 Moscow, Russia
Irina E. Vlasova: Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1 bld. 3, 119991 Moscow, Russia
Konstantin B. Rozov: Institute of Environmental Geology, Russian Academy of Sciences, Sredniy Ave., 41, 199004 St. Petersburg, Russia
Iurii M. Nevolin: Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1 bld. 3, 119991 Moscow, Russia
Vasiliy O. Yapaskurt: Department of Geology, Lomonosov Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia
Vyacheslav G. Rumynin: Institute of Environmental Geology, Russian Academy of Sciences, Sredniy Ave., 41, 199004 St. Petersburg, Russia
Stepan N. Kalmykov: Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1 bld. 3, 119991 Moscow, Russia

Energies, 2022, vol. 15, issue 19, 1-16

Abstract: The sorption behavior and spatial microdistribution of Cs-137, Sr-90 and Am-241 onto the surface of a fractured rock sample from the R-11 borehole of the exocontact zone of the Nizhnekansky granitoid massif were studied. The sorption efficiency of the fractured sample increases in the row of Sr < Cs < Am, where americium is the most retained radionuclide. Based on the image processing of radiograms and scanning electron microscopy data, the mineral relative sorption efficiency (RSE) values were determined to quantify the contribution of the mineral phases of the fractured sample to radionuclide retention. It was established that cesium and strontium are predominantly retained in cracks filled with secondary mineral chlorite. Zeolite is a less effective sorbent with respect to cesium and strontium. Americium sorption is uniform over the whole surface of the fractured sample, with close RSE values for all mineral phases (RSE ~1). The behavior of cesium in heterogeneous and monomineral systems of crushed mineral phases of quartz, biotite and zeolite NaA imitating minerals of the fractured rock sample R-11 was determined. It was shown that the fraction of the sorbed cesium in a heterogeneous system of two mineral phases—biotite and quartz—was larger than the sum of sorption values for the same separated mineral phases. Based on the models of radionuclide sorption on illite–smectite minerals, it was able to estimate the depth of the penetration of solution into the fractured rock sample R-11. The variations of penetration depths for solutions of specific radionuclide into the fractured rock sample were established.

Keywords: sorption; spatial microdistribution of radionuclides; digital autoradiography; fractured rock sample; Nizhnekansky granitoid massif; relative sorption efficiency of minerals; models of radionuclide sorption (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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