Portable Inspection Technology For Shot Peening As Preventive Maintenance At Steel Bridges

Positron annihilation lifetime spectroscopy (PALS) is a non-destructively technique to study open-volume lattice defects such as vacancies or dislocations, which is used for fatigue, aging and shot peening inspection. In this study, we developed a portable PALS apparatus that has the ability for on-site measurement[1,2]. We developed the light-shielding technique which enable us to do on-site measurement. Furthermore, we downsized the apparatus size using Monte Carlo simulation technique. We validated that the developed portable apparatus has the same measurement capabilities as the conventional system[1]. We concluded that the developed portable apparatus is sufficiently able to capture the change caused by shot-peening time and the aging of rust at actual bridge.