THE GROWTH OF COLLOIDAL CENTRES IN IRRADIATED ALKALI HALIDES

Abstract The alkali halides are very susceptible to radiation damage in the halogen sublattice when exposed to ionizing radiation, the primary products being F-centres and interstitial halogen atoms (H-centres). Experimental observations have shown that clustering of the H-centres leads to the formation and growth of perfect interstitial loops. Further recent studies by Hobbs (1975) on the growth of colloidal Na centres by F-centre aggregation in NaCl irradiated to high doses have shown several features in common with the growth of voids in heavily irradiated metals. In this paper we present a theoretical model suggested by this analogy and by other knowledge of defects and radiation damage in the alkali halides. Though some of the parameters needed for quantitative predictions are not known accurately enough, the properties of the model in general are in good agreement with the available, rather limited experimental data on colloid growth in NaCl. For example, the predicted dependence of colloid growth u...

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