On-Site Non-Destructive Inspection of Bridges Using the 950 keV X-Band Electron Linac X-ray Source
Mitsuru Uesaka*1,†, Yuki Mitsuya*1, Eiko Hashimoto*1, Katsuhiro Dobashi*1, Ryota Yano*2, Hiroaki Takeuchi*2, Jean-Michel Bereder*2, Joichi Kusano*3, Eiji Tanabe*3, Natsuyo Maruyama*4, Yukiya Hattori*4, Masahiro Tatewaka*5, Hironobu Ono*5, Kentaro Murata*6, Atsushi Koishikawa*6, Futoshi Kaibuki*7, Hideo Sakurai*8, Yoshichika Seki *9, Yoshinobu Oshima*10, and Masahiro Ishida*10
*1Nuclear Professional School, School of Engineering, The University of Tokyo
Shirakata-shirane 2-22, Tokai-mura, Naka-gun, Ibaraki 319-1188, Japan
*2Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, Tokyo, Japan
*3Accuthera Inc., Kanagawa, Japan
*4Hitachi Power Solutions Co., Ltd., Ibaraki, Japan
*5KANTOGIKEN Co., Ltd., Ibaraki, Japan
*6XIT Co. Ltd., Tokyo, Japan
*7Atomy Research Inc., Japan
*8SAKURAI and Associates Inc., Japan
*9J-PARC Center, Japan Atomic Energy Agency, Ibaraki, Japan
*10Center for Advanced Engineering Structural Assessment and Research, Public Works Research Institute, Ibaraki, Japan
Regular diagnosis of the structural health of infrastructure, such as bridges, is indispensable to ensure safety and reliable operation of the society. Non-destructive tests based on X-ray imaging are powerful tools to inspect the inside of a concrete structure in detail. Establishing a diagnostic method of bridges based on X-ray visualization is required to examine the internal conditions and helps in the rationalization of maintenances. We demonstrated our 950 keV X-band electron linac based X-ray source for on-site actual bridge inspection and visualized the inner structure of a bottom floor slab. For the more precise inspection of the conditions of wires and rods, we applied three-dimensional image reconstruction methods for bridge mock-up samples. Partial angle computed tomography and tomosynthesis gave cross section images of the samples with 1 mm resolution. We are planning to investigate another part of the bridge, with the 950 keV X-ray system in the near future.
-  P. Chang et al., “Review paper: health monitoring of civil infrastructure,” Struct. Health Monit., Vol.2, No.3, pp. 257-267, September 2003.
-  M. Uesaka et al., “950 keV, 3.95 MeV and 6 MeV X-band linacs for nondestructive evaluation and medicine,” 2011 Nucl. Instrum. Methods Phys. Res. A., Vol.657, Issue 1, pp. 82-87, November 2011.
-  T. Natsui et al., “Development of a Portable 950 KeV X- band Linac for NDT,” The American Institue of Physics Conf. Procs. Series, Vol.1099, pp. 75-78, 2009.
-  M. Jin et al., “Upgraded X-band 950 keV Linac X-ray Source for On-site Inspection at Petrochemical Complex,” Proc. IPAC 2011, pp. 3574-3576, 2011.
-  L. T. Niklason et al., “Digital tomosynthesis in breast imaging,” Radiology, Vol.205, pp. 399-406, November 1997.