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Pure, well-annealed platinum specimens and platinum specimens containing quenched-in vacancies were bombarded near 5°K with 20-MeV deuterons. Both damage production and recovery were studied. The quenched-in vacancies increase both the initial production rate and the fall in this rate with increasing deuteron dose. A model based upon defocusing at divacancies is used to explain these features. Recovery of the damage occurred in four main stages. The excess vacancies affect the amount of recovery and/or the temperature of maximum recovery rate in each stage. Recovery also depends on the dose. The principal annealing processes in each stage are identified as: stage I, close-pair recombination and free migration of interstitials; stage II, release of mobile interstitials from traps; stage III, migration of a second type of interstitials; stage IV, vacancy migration.

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