Exposure and Temperature Dependence of Elongated Blister Formation in Complex Radiation Environments

摘要

Blistering of platinum alloy surfaces by exp 252 Cf alpha particle and fission fragment radiations occurred at relatively low concentrations of implanted helium during exposures at room temperature as well as at 1000 exp 0 C. Distinctive configurations of the blisters resulting from transport of atoms displaced by the fission fragments persisted during the high temperature exposures. Post-exposure heating of specimens exposed at room-temperature produced no additional blistering until temperatures of 1300 exp 0 C were reached. Post-exposure heating of 1000 exp 0 C blistered specimens produced only thermal etching effects. The low helium concentrations required for blistering and the distinctive blister configurations produced by exp 252 Cf exposures suggest a unique mode of surface distortion resulting from the large number and highly localized distributions of atom displacements generated by exp 252 Cf fission fragments. Such conditions may not be duplicated in the He-ion and fast neutron radiation environments of fusion reactors. (ERA citation 06:029676)