Ranges of 40Â keV ions in polycrystalline tungsten and gold

Integral range profiles for various 40 keV radioactive ions from 7Be to 204Tl were measured in tungsten and gold using sectioning techniques based on anodizing and stripping. Measured range distributions exhibited long tails extending into the metals. Median range values for a given ion were the same in tungsten as in gold, but were about 1.7 times greater than calculations of projected ranges based on the SRIM computer code.