Abstract
The Stone Mountain granite, Georgia, (USA) is shown to contain radiohalos of the single-ring type, probably 210Po. Xenoliths collected from the same site are devoid of radiohalos, but do contain crystalline inclusions (probably zircons) that are bordered by diffuse radiation stains. The granite samples in this study yielded no zircon crystals and no diffuse radiation stains. These data are insufficient to determine the timing and mode of formation of these radiohalos in the Stone Mountain granitic pluton, so further studies are warranted.