Abstract
The skin thickness of blisters formed on polycrystalline niobium under irradiation at room temperature by 4He + at energies of 15 to 80 keV have been measured. Similar measurements were conducted for 10-keV 4He + irradiation at 500°C to increase blister exfoliation, and thereby allow examination of a larger number of blister skins. For energies less than 100 keV the skin thicknesses are compared with both the projected range and the damage-energy distributions constructed from moments interpolated from Winterbon's tabulated values. The projected ranges and damage-energy distributions have also been computed with a Monte-Carlo program. For energies greater than 100 keV the projected ranges of 4He +in Nb were calculated using either Brice's formalism or the one given by Schiøtt. The thicknesses of blister skins for 60 and 80-keV irradiations, and those reported earlier for 100 to 1500-keV irradiations correlate well with calculated projected ranges. For irradiation energies less than 60 keV the measured thicknesses are greater than the calculated ranges.
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