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Clays and Clay Minerals; February 2002; v. 50; no. 1; p. 35-37
© 2002 Clay Minerals Society
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ON THE STRUCTURAL STABILITY OF MONTMORILLONITE SUBMITTED TO HEAVY {gamma}-IRRADIATION

Alicia Negron1, Sergio Ramos1, Alexander L. Blumenfeld2, Graciela Pacheco2 and Jose J. Fripiat2,*,{dagger}

1 Instituto de Ciencias Nucleares, UNAM, A.P.70-543 C.U. México 04510 D.F., Mexico
2 Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin, USA

* E-mail address of corresponding author: fripiat{at}aleph.cinstrum.unam.mx

The effect of heavy doses (up to 200 Mrad) of {gamma}-radiation on the short-range structural organization in montmorillonite was studied using infrared (IR) spectroscopy and solid-state high-resolution 27Al and 29Si nuclear magnetic resonance (NMR). No change attributable to irradiation was observed. A small variation in the water content was noted but it is not systematic. The results show that the montmorillonite structure can accumulate high doses of radiation without damage and therefore this clay is a suitable material for use in the safe disposal of radioactive waste.

Key Words: {gamma}-radiation • Smectite






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