Hiroaki Takeuchi and Jean-Michel Bereder, Department of Nuclear Engineering and Management, win Industrial Committee Student Poster Award at IPAC


International Particle Accelerator Conference (IPAC) is the main annual event for the worldwide accelerator community and industry with presentations of the latest results from accelerator R&D and on the progress in existing, planned and future accelerator facilities. Industrial Committee Student Poster Awards were given to students whose work, presented in the special session for students, most incorporates criteria relative or applicable to industry.


<About awarded research>



Structural Analysis and Evaluation of Actual PC bridge using 950 keV/3.95 MeV X-band Linacs

In Japan, bridges constructed during the strong economic growth era are facing an aging problem and advanced maintenance methods have become 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 bridges, including cracks of concrete, location and state of tendons (wires) and other imperfections. In this research, at the on-site inspections, 950 keV linac exhibited sufficient performance. But, for thicker concrete, it is difficult to visualize the internal state by 950 keV linac. Therefore, we proceeded the installation of 3.95 MeV linac for on-site bridge inspection. In addition, for accurate evaluation, verification on the parallel motion CT technique and FEM analysis are in progress.



Development of Moisture Distribution Measurement Technology for Social Infrastructure using Mobile Linac-driven Neutron Source


During the period of rapid economic growth from the 1950s to the 1970s, Japanese governmental investment in infrastructural projects such as bridges and buildings expanded rapidly. However, most of the industrial and social infrastructure projects had an estimated lifetime of only approximately 50 years, so the declining strength of concrete structures has become an issue of national importance. The development of a neutron backscatter moisture detection system using a linear accelerator driven neutron source to measure moisture distribution in concrete structures is now under development. By combining the knowledge of the moisture distribution in concrete structures, the corrosion probability distribution of iron reinforcing rods can be estimated. This research is aimed at developing the non-destructive inspection technology usable on-site.