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Removal of Radiation Damage from Graphite by Alternate Reirradiations and Low-Temperature Anneals

Donald G. Schweitzer and Robert M. Singer

Nuclear Science and Engineering / Volume 19 / Number 4 / August 1964 / Pages 385-389

Technical Paper / dx.doi.org/10.13182/NSE64-A18992

Analyses of property changes during reirradiations and anneals show that the technique of alternate reirradiations and anneals can be used consistently to remove radiation damage from graphite. Laboratory experiments, monitoring studies and reactor-height measurements all correlate favorably. It is shown that the recovery for a reirradiation and annealing cycle is independent of irradiation temperature between 30 C and 200 C and total damage over wide ranges. The reciprocal of the recovery per cycle is a linear function of the exposure between anneals with a slope that is determined by the anneal temperature.