scholarly journals On-Site Bridge Inspection by 950 keV/3.95 MeV Portable X-Band Linac X-Ray Sources

2020 ◽  
Author(s):  
Mitsuru Uesaka ◽  
Yuki Mitsuya ◽  
Katsuhiro Dobashi ◽  
Joichi Kusano ◽  
Eiji Yoshida ◽  
...  
Keyword(s):  
Bridge Inspection ◽  
X Ray ◽  
X Band

On-Site Non-Destructive Inspection of Bridges Using the 950 keV X-Band Electron Linac X-ray Source

2017 ◽  
Vol 12 (3) ◽  
pp. 578-584 ◽  
Author(s):  
Mitsuru Uesaka ◽  
◽  
Yuki Mitsuya ◽  
Eiko Hashimoto ◽  
Katsuhiro Dobashi ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Bridge Inspection ◽  
Electron Linac ◽  
X Ray ◽  
Band Electron ◽  
Reconstruction Methods ◽  
X Ray Imaging ◽  
X Band ◽  
Near Future ◽  
Non Destructive

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.

On-site nondestructive inspection by upgraded portable 950 keV/3.95 MeV X-band linac x-ray sources

2014 ◽  
Vol 47 (23) ◽  
pp. 234008 ◽  
Author(s):  
Mitsuru Ueaska ◽  
Katsuhiro Dobashi ◽  
Takeshi Fujiwara ◽  
Cuixiang Pei ◽  
Wenjing Wu ◽  
...  
Keyword(s):  
Nondestructive Inspection ◽  
X Ray ◽  
X Band

Compact inverse compton scattering hard X-ray source based on X-band linac

2002 ◽  
Vol 14 (1-4) ◽  
pp. 221-226 ◽  
Author(s):  
Atsushi Fukasawa ◽  
Tetsuya Kobayashi ◽  
Mitsuru Uesaka ◽  
Junji Urakawa ◽  
Toshiyasu Higo ◽  
...  
Keyword(s):  
Compton Scattering ◽  
X Ray ◽  
Inverse Compton Scattering ◽  
X Band ◽  
Inverse Compton

Medical and Nuclear Applications of Micro Electron-Beam Linear Accelerator X-Ray Sources

2009 ◽  
Vol 3 (5) ◽  
pp. 523-532 ◽  
Author(s):  
Eiko Hashimoto ◽  
◽  
Tomohiko Yamamoto ◽  
Takuya Natsui ◽  
Kazuyoshi Koyama ◽  
...  
Keyword(s):  
Linear Accelerator ◽  
Medical Physics ◽  
Developmental Outcomes ◽  
Cross Sectional ◽  
X Ray ◽  
Laser Technologies ◽  
X Band ◽  
Innovative System ◽  
Medical Radiology ◽  
Nuclear Applications

Our group is engaged in creating an innovative system in which an X-band linac X-ray source and 12TW50fs laser technologies are applied to medical and nano-technical uses. As pioneers in medical physics for reliable and safe medical radiology, we have endeavored to develop advanced laser beam technologies for cross-sectional and fused applications in the humanities and natural sciences to yield new synergies. This paper describes the developmental outcomes we have achieved to date.

scholarly journals Experiment of X-ray source by 9.4 GHz x-band linac for nondestructive testing system

2007 ◽  
Author(s):  
Takuya Natsui ◽  
Tomohiko Yamamoto ◽  
Fumito Sakamoto ◽  
Akira Sakumi ◽  
Katsuhiro Dobashi ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Testing System ◽  
X Ray ◽  
X Band

LASER PULSE CIRCULATION SYSTEM FOR COMPACT MONOCHROMATIC TUNABLE HARD X-RAY SOURCE

2007 ◽  
Vol 22 (23) ◽  
pp. 4324-4332
Author(s):  
HARUYUKI OGINO ◽  
MENG DE ◽  
TOMOHIKO YAMAMOTO ◽  
FUMITO SAKAMOTO ◽  
KATSUHIRO DOBASHI ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Circulation System ◽  
X Rays ◽  
Electron Linear Accelerator ◽  
Yag Laser ◽  
X Ray ◽  
X Band ◽  
Rf Pulse ◽  
Under Construction ◽  
The University

We are construcing a laser electron Compton scattering monochromatic tunable hard X-ray source. It consists of the X-band (11.424 GHz) electron linear accelerator and Q-switch Nd : YAG laser. This work is a part of the JST (Japan Science and Technology Agency) project. The whole system is a part of the national project on the advanced compact medical accelerator development, hosted by NIRS (National Institute for Radiological Science). The University of Tokyo and KEK are working for the X-ray source. Main advantage of this X-ray source is monochromatic tunable hard X-rays (10-50keV) with the intensities of 108-109 photons/s. The table-top size X-ray source can generate dual energy monochromatic hard X-ray by turns and it takes about 40ms to chage the X-ray energy. It is calculated that the X-ray intensity is 107 photons/RF-pulse (108 photons/s in 10 pps) by the 35MeV electron and YAG laser (2J/pulse). The X-band beam line for the demonstration is under construction. We designed a laser pulse circulation system to increase the X-ray yield 10 times higer (up to 108 photons/RF-pulse, 109 photons/s). It can be proved that the laser total energy increases 10 times higher by the principle experiment with the lower energy laser (25mJ/pulse).

scholarly journals Highway PC Bridge Inspection by 3.95 MeV X-Ray/Neutron Source

2021 ◽  
Author(s):  
Mitsuru Uesaka ◽  
Katsuhiro Dobashi ◽  
Yuki Mitsuya ◽  
Jian Yang ◽  
Joichi Kusano
Keyword(s):  
Structural Analysis ◽  
Nondestructive Evaluation ◽  
Neutron Source ◽  
Bridge Inspection ◽  
Neutron Sources ◽  
Floor Slab ◽  
X Ray ◽  
Transmission Imaging ◽  
Back Scattering ◽  
Early Degradation

We have developed portable 950 keV/3.95 MeV X-ray/neutron sources and applied them to inspection of PC concrete thicker than 200 mm within reasonable measuring time of seconds - minutes. T-girder-, Box- and slab- bridges are considered. Now we are to start X-ray transmission inspection for highway PC bridge (box) by using 3.95 MeV X-ray sources in Japan in 2020. By obtaining X-ray transmission images of no-grout-filling in PC sheath and thinning of PC wires, we plan to carry out numerical structural analysis to evaluate the degradation of strength. Finally, we are going to propose a technical guideline of nondestructive evaluation (NDE) of PC bridges by taking account of both X-ray inspection and structural analysis. Further, we are trying to detect rainwater detection in PC sheath, and asphalt and floor slab by the 3.95 MeV neutron source. This is expected to be an early degradation inspection. We have done preliminary experiments on X-ray transmission imaging of PC wires and on-grout-filling in the same height PCs in 450–750 mm thick concretes. Moreover, neutron back scattering detection of water in PC sheath is also explained.

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