Recovery of low-temperature fast neutron irradiated tungsten

The recovery after fast neutron irradiation at about 10°K of W with various treatments is investigated by electrical resistivity measurements and the recovery structure is determined from 15°K to 420°K. The stage I below 90°K of W consists of at least five substages after fast neutron irradiation. Radiation doping enhances the amount of recovery in stages I and II. In W , the effect of doping does not vanish when doped is annealed at 400°C, where stage III is completed. This is contrast with Mo where the enhancement vanishes when doped specimen is annealed above stage III.