Effect of gamma-irradiation on adsorption properties of Slovak bentonites

M. Galamboš; M. Daňo; O. Rosskopfová; F. Šeršeň; J. Kufčáková; R. Adamcová; P. Rajec

doi:10.1007/s10967-012-1638-9

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 292: Issue 2

Effect of gamma-irradiation on adsorption properties of Slovak bentonites

Authors:

M. Galamboš

M. Galamboš Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, 842 15 Bratislava, Slovak Republic

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M. Daňo

M. Daňo Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, 842 15 Bratislava, Slovak Republic

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O. Rosskopfová

O. Rosskopfová Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, 842 15 Bratislava, Slovak Republic

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F. Šeršeň

F. Šeršeň Institute of Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, 842 15 Bratislava, Slovak Republic

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J. Kufčáková

J. Kufčáková Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, 842 15 Bratislava, Slovak Republic

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R. Adamcová

R. Adamcová Department of Engineering Geology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, 842 15 Bratislava, Slovak Republic

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P. Rajec

P. Rajec Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, 842 15 Bratislava, Slovak Republic

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Pages:: 481–492

Online Publication Date:: 27 Jan 2012

Publication Date:: 01 May 2012

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-012-1638-9

Keywords:: Sorption; Strontium; Cesium; Radiation stability; Slovak bentonites; Illite/smectite; Radioactive waste; Spent nuclear fuel; Deep geological repository

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Abstract

One of the basic prerequisites for the use of bentonite as engineering barrier in deep geological repositories for radioactive waste and spent nuclear fuel is their stability against ionizing radiation stemming from radionuclides present in radioactive waste and spent nuclear fuel. The aim of this study was to compare the changes in the adsorption properties of selected Slovak bentonites in relation to uranium fission products (¹³⁷Cs and ⁹⁰Sr), prior to and after irradiation of bentonites with a ⁶⁰Co γ-source and specifying the changes in the structure of Slovak bentonites induced by γ-radiation. The changes in irradiated natural forms of Slovak bentonites and the changes in their natrified analogues and fractions with different grain sizes were studied from five Slovak deposits: Jelšový potok, Kopernica, Lastovce, Lieskovec and Dolná Ves. The EPR spectra of bentonites from deposits Jelšový potok and Lieskovec with absorbed doses of 10⁴ and 10⁵ Gy γ-rays showed no changes in the structure of the studied Slovak bentonites. The changes, which in terms of structure destabilization can be considered insignificant, occurred only in bentonites with absorbed doses of γ-radiation as much as 1 MGy. The absorbed dose of 1 MGy γ-radiation did not have an effect on the adsorption of cesium on every studied bentonite. Changes that can also be regarded as insignificant occurred only during strontium adsorption, especially on Fe–bentonite from deposit Lieskovec and Ca–Mg–bentonite from deposit Jelšový potok, when an increase in the adsorption capacity occurred. Attention should be paid in further research of this topic which would require carrying out experiments on bentonite samples with absorbed doses higher by several orders of magnitude.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)