Irradiations of uranium true single crystals and lineage crystals are described. Analysis of the dimensional and shape changes results in the crystallographic deformation rates: G[ioo] =-420 ± 20, Gpio]-420 ± 20,andG[ooi] = 0±20, where G is the logarithmic increment divided by the fission ratio. The lineage crystals elongated in the [010] direction at appreciably higher rates than the single crystals.

Effect of Irradiation on the Microstructure of Thorium-15 w/o Uranium Alloy from Melt No. C16F-218 20. Effect of Irradiation on the Microstructure of Thorium-20 w/o Uranium Alloy from Melt No. C16F-229 28 21. Effect of Irradiation on the Microstructure of Thorium-25 w/o Uranium Alloy from Melt No. C16F-220 , 22. Effect of Irradiation on the Microstructure of Thorium-31 w/o Uranium Alloy from Melt No. Y16F-190 30 23. Cracking in Thorium-31 w/o Uranium Alloy Irradiated to 4.1 a/o Burnup at 900°C 24. Probability of Escape of Fission Recoils from Uranium Particles with Slab Geometry as a Function of Particle Thickness 31

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