Author: Dobashi, K.
Paper Title Page
THPVA098 Development of a 3.95 Mev X-Band Linac-Driven X-Ray Combined Neutron Source 4692
SUSPSIK121   use link to see paper's listing under its alternate paper code  
 
  • J.M. Bereder, K. Dobashi, Y. Mitsuya, M. Uesaka
    The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
  • M. Ishida, Y. Ohshima
    PWRI, Ibaraki, Japan
  • J. Kusano
    Accuthera Inc., Kawasaki, Kanagawa, Japan
  • Y. Takahashi
    The University of Tokyo, Tokyo, Japan
  • Y. Tanaka
    The University of Tokyo, Institute of Industrial Science, Tokyo, Japan
 
  Funding: Council for Science, Technology and Innovation (CSTI), Cross-Ministrial Strategic Innovation Promo-tion Program (SIP), Japan Science and Technoogy Agency (JST)
The existing non-destructive inspection method employed for concrete structures uses high energy X-rays to detect internal flaws in concrete structures and iron reinforcing rods. In addition to this conventional method, the authors are developing an innovative inspection system that uses a mobile compact linac-driven neutron source that utilizes neutron backscattering, to measure the moisture content in concrete structures and estimate the corrosion probability distribution of iron reinforcing rods. By combining the knowledge of the moisture distribution in concrete structures with the information of its inner structure, the remaining life of concrete structures can be estimated. Further experiments will be conducted in the laboratory, and the moisture detection experiment in the real bridge is scheduled for 2017.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA098  
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THPVA102 Structural Analysis and Evaluation of Actual PC Bridge Using 950 keV/3.95 MeV X-Band Linacs 4701
SUSPSIK029   use link to see paper's listing under its alternate paper code  
 
  • H. Takeuchi, R. Yano
    The University of Tokyo, Tokyo, Japan
  • K. Dobashi, Y. Mitsuya, M. Uesaka
    The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
  • M. Ishida, Y. Ohshima
    PWRI, Ibaraki, Japan
  • J. Kusano
    Accuthera Inc., Kawasaki, Kanagawa, Japan
  • I. Ozawa
    The University of Tokyo, The School of Engineering, Tokyo, Japan
 
  Funding: This work was supported by Council for Science, Technology and Innovation(CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP) (Funding agency: JST).
In Japan, bridges constructed in the highly economic growth era are facing to aging problem and advanced maintenance methods have been strongly required recently. To meet this demand, we develop the on-site inspection system using 950 keV/3.95 MeV X-band (9.3 GHz) linac X-ray sources*. These systems can visualize in seconds the inner states of bridge, including cracks of concrete, location and state of tendons (wires) and other imperfections. We focused on the inspection for wires which are critical to the safety of bridge. At the on-site inspections, the X-ray inspection system exhibited sufficient accuracy to detect the wire's corrosion. We also evaluated the maximum thickness of concrete to which our system can be applied. Using the 950 keV system, we conducted on-site inspection for real bridges and performed structural analysis to evaluate the bearing capacity of the bridge using finite element method. We plan to apply the 3.95 MeV linac for actual bridge inspection to extend the applicable range in 2017. For accurate visualization, the parallel motion CT technique for bridge inspection is in progress.
* Mitsuru Ueaska et al, On-site nondestructive inspection by upgraded portable 950keV/3.95MeV X-band linac x-ray sources, J. Phys. B: At. Mol. Opt. Phys. 47(2014) 234008 (9pp)
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA102  
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