The annealing of irradiation damage in graphite

摘要: Abstract A detailed study has been made of the thermal annealing irradiation damage in graphite after fast neutron bombardment at temperatures between 150° C and 350° C. The includes two types material, highly crystalline well-oriented pyrolytic Pile Grade “A” polycrystalline reactor graphite. physical properties investigated were dimensional changes, conductivity expansion coefficients on both materials electrical resistivity Young's modulus It is shown that analysis changes annealing, using together with theory Simmons, leads to crystal reasonable agreement those observed found induced by above 300° are essentially non-annealable, although all other recover their unirradiated values. results show there a transition from recoverable nonrecoverable this temperature range also defects mainly responsible for have little effect properties. interpreted terms recent discussions defect content irradiated these stages allocated specific reactions.