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Samples of bulk polycrystalline ThO 2 were bombarded with 5‐MeV α‐particles to doses between 9.4×10 16 and 6.0×10 17 ions/cm 2 . The sample which received the highest dose spalled during bombardment; those receiving lower doses either did not spall or did so only after postirradiation annealing. The spalling was investigated by X‐ray analysis and replica and transmission electron microscopy. It is concluded that spalling resulted from severe lattice strains at the interface between damaged and undamaged material and that sintering pores played a part in the fracture process. The role of lattice defects in initiating fracture is discussed.
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Clinard et al. (1971) studied this question.
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