We are developing portable non-destructive testing (NDT) X-ray source with X-band linac and low power magnetron. Now, we start the experiment of electron acceleration and X-ray generation using by 950 keV X-band linac NDT system. The 950 keV X-band linac X-ray generator is under development for corrosion wastage of tubes and condition bas ed maintenance of impeller pumps. However, about 1 MeV X-ray source can be only used for thin tubes of about 20 mm thickness. Therefore, we start to design about 4 MeV X-...
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Development of High Energy X-ray NDT System with 3.95 MeV X-band Linac

We have been developed 9.4 GHz X-Band linac and 250kW magnetron for X-ray nondestructive tes ting system for Condition Based Maintenance (CBM). Our linac's energy is 950 keV, which fits to Japanese regulation to take them to outside of radiation controlled area. This small port able linac enables to diagnosis the moving facility, such as bearing in Nuclear Power Plants....
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Development of 960keV X-Band Linac for Portable Nondestructive Testing System

Abstract: A hybrid, noncontact laser-EMAT ultrasonic system, using a pulsed laser for ultrasound generation and an EMAT (electromagnetic acousti c transducer) for ultrasound detection, is developed and studied on NDT of crack in materials. Instead of using longitudinal diffraction wave i n the conventional TOFD method, the LTS mode-converted wave scattered from the crack tip is recommended to be applied in the laser-EMAT TOFD mea surement. A modified time-of-flight (TOFD) method based on laser-EMAT ultraso...
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Laser-EMAT ultrasonic testing of cracks with TOFD method

Abstract: Since more and more bridges built several decades ago in Japan have become aged and dangerous, the non-destructive evaluation of those bridges is really an urgent problem. CT system with portable 3.95MeV linacs for bridge inspection is considered to work on-site, considering the law of Japanese radiation protection allows using linacs up to 4MeV outside radiation controlled area. The system would confirm the internal steel si tuation of bridges and analyze structural strain and stress with 3D mod...
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On-Site Bridge Inspection with Partial CT by 3.95Mev X-Band Linac Source

In situ CT application for NDE of degradation bridges is under development, with portable 950keV/3.95 MeV X-band linac as x-ray source. Collimator is adopted to reduce scattered X-ray noise. Material analysis and erosion estimation through dl-energy CT method is integrated in order to inspect the erosion situation of i nner steel rod. Reconstruction technique with incomplete projection data is studd considering limitation of projection angle range during onsite scanning. Furt hermore, based on 3D model bui...
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Partial Inspection and Dual-energy CT Material Analysis with 950keV/3.95MeV X-Band Linac

Combination of Microwave Hyperthermia and Radiation Therapy is effective for treatment of tumor. After increasing the temperature the tumor becomes more sensitive to radiation dose. In this paper, the Invasive and Non-invasive microwave antennas were designed and applied on different tissues including malignant tumor, and respective Specific Absorption rate (SAR) patterns and temperature rises were investigated. For invasive antenna, coaxial-slot antennas was investigated and for non-invasive antenna, ...
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SAR Patterns of Invasive and Non-invasive Antenna Array in Combination of Hyperthermia and Radiation Brachytherapy

吉田 光宏 Mitsuhiro YOSHIDA 山本 昌志 Masashi YAMAMOTO 中村 直樹 Naoki NAKAMURA ...
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Portable 950keV X-band Linac X-ray Source for On-site NDT

Neutron diffraction technique is one of prevailing method to measure inner structure of material, such as molecular arrangement and lattice spacing by means of penetration of neutron. In particular the residual stress measurement by neutron diffraction has been developed an d is greatly performed in many research facilities, because the examination of residual stress existing materials is critically important to estimate fatigue of the materials and to maintain structural objects for efficient utilization....
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Measurement of Inner Residual Stress of Bearing by Neutron Diffraction Technique

Our portable X-band (9.3GHz) 950KeV linac has been successfully upgraded. The problems of RF power oscillation , beam current oscillation and reduction and finally lack of X-ray intensity were solved by replacing the axia l coupling cavities with the side-coupled ones. Designed X-ray dose rate of 0.05 Sv/min@lm is going to be achi eved. Length of the accelerating tube is reduced to less than 25 cm. X-ray source part with the local radiation shielding is connected by the flexible waveguide with the box of t...
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Study on Portable X-band 950keV linac X-ray Sourcefor On-site Nondestructive Inspection

We are developing X-ray nondestructive testing (NDT) system using with portable X-band linac. This system uses 2.4 GHz X-band linac and 250 kW magnetron. Our system energy is 950 keV for Japanese regulation. Th erefore we can use it on-site using local radiation protection. We measured electron beam and X-ray. We have started X-ray maging test. We will use this system for condition based maintenance of pump-impeller a t nuclear plants. The linac based X-ray source can generate pulsed X-ray. Therefore we ca...
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Macro Damage Observation of Bearing using Portable X-band Linac Based X-ray Source