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Thermal recovery studies on single crystals of naturally self-irradiated uraninite and thorianite, (U, Th)O 2 , have indicated lattice expansion of ≃ 0.5%, which is greater by a factor of ≃ 5 from lattice dilatation in < 100°C reactor-irradiated UO 2 and ThO 2 , and by a factor of ≃ 1.6 from saturated lattice dilatation in self-irradiated PuO 2 , AmO 2 and...