I have read two or three papers on the effect of gamma radiation on nano materials or nano oxides. in fact, most of the published data involve no significant changes. I think the used power of the incident gamma radiation should be great enough to induce changes. Further, I think that oxides containing elements such as Pb, Rn, etc. might be promising for investigation.
The answer to your question is not simple. You can see the following references: http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/46/066/46066335.pdf http://files.bvs.br/upload/S/0104-7914/2015/v23n68/a5424.pdf http://www.tsijournals.com/articles/effect-of-sterilization-with-gamma-radiation-on-feldspathic-ceramics.pdf https://link.springer.com/article/10.1134/S0020168516120128
Practically there is no effect. Assuming some accident occurs then in that case it's very very rare to observe some colouration but humans will not survive at that gamma dose. So no effect at normal dose levels which generally we receive.
While performing experiment in lab with such samples there may be colouration and loss of strength at MGy dose levels. This happens to all materials even electronic components at kGy to MGy doses.
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