Wear diagnostics of industrial material using RI beams of 7Be and 22Na

As a possible example of radioactive ion (RI) beams for industrial application, intense beams of 7Be and 22Na used for wear diagnostics of mechanical parts is considered. For wear diagnostics, radioactive nuclei which have appropriate long life-time such as from several weeks to a few years are applicable. As those nuclei are located near the stable line, an in-flight RI beam separator can provide intense RI beams with enough high energy for implantation in atmosphere. Beam studies were performed to evaluate the intensity, uniformity, and depth profile of the implanted RI. We could achieve peak activity of 1.3 and 0.08 (kBq/μm)/(1 pμA × 1 h irradiation) at 13 and 50 μm peak depth with 20 and 150 μm maximum depth from the surface of an aluminum sample for 7Be and 22Na, respectively