Verifying the potential of micro-focus X-ray computed tomography in the study of ancient bone tool function

The results of 22 micro-focus X-ray computer tomography (micro-CT) scans of one-hundred-year-old bone arrowheads and link-shafts are presented. These data build on previous experimental research that sought to establish a new use-trace method for identifying archaeological bone arrowheads where surface damage is lacking. The results presented here confirm the potential of micro-CT for imaging bone micro-structure but highlight the variable conditions under which micro-cracks and fatigue fractures may develop. Micro-cracks associated with impact crushing occur more often than those associated with bending forces, but cannot be used in isolation to ascribe hunting function. Link-shafts are more likely to develop micro-structural damage unrelated to hunting activities. In order for micro-structural damage to be informative about the nature of use, a 'tool' must have been frequently used in order for sufficient damage to accrue.