We have developed techniques for implanting 7Be and/or 22Na in the surface layer of a sample to be used for tribology studies. Wear of the surface can be studied by following the γ-rays from these activities. We produce the activities with heavy-ion beams ( 14N and 20Ne) on C and Al targets, and by choosing the energy of the beam and a suitable set of absorbers we can produce a desired dose-depth profile in the implanted surface. These techniques are independent of the material being studied for wear, so they can be applied to low- Z materials, such as ceramics and plastics. They also produce far less radiation damage to the surface than do conventional activation techniques — a factor of 10 5 between primary beam and implanted secondary beam. And the γ-ray spectra are very clean, making studies possible with NaI(Tl) as well as Ge detectors. Our studies thus far have concentrated on an Si 3N 4 disc, implanted to a depth of 0.051 cm with 7Be. Our sensitivity to wear is of the order of 100 nm.