Research Groups

1. Development of evaluation method for microphone sensitivity in infrasound frequency range.
2. Reliability evaluation of low-frequency vibration and microvibration measurement.
3. Development of triaxial accelerometer evaluation technology using high-frequency and high-intensity shock.

Fig.1 Microphone calibration system using liquid column type sound pressure generator.

Fig. 2 Laser interferometer low-frequency vibration calibration system.

1. Development of dose standards for medical radiological equipment
   We are developing measurement standards for radiation therapy, such as high energy photon beams and electron beams from a clinical linac, Ir-192 brachytherapy, and carbon ion beams.
2. Development of dose standards for eye lens
   We are developing standards on 3 mm dose equivalent for beta-rays and low energy X-rays, which are important for the evaluation of dose in eye lens.
3. Development of measurement technology required for the Fukushima accident
   We are developing the technique to measuring environmental radiation, calibration technique for low level dose rate, and so on.

Dose evaluation of radiation from a linac

Calibration system for low level radiation

Development of measurement technology for environmental radiation

1. Development of activity measurement techniques and standards
   We are developing various standards for activity measurements. We have developed a brown rice reference material for radioactive cesium analysis. It is widely used in measuring institutes for improving their capabilities.
   We are assisting their activities by conducting proficiency tests continuously.
   
2. Development of neutron measurement techniques and standards
   We are developing neutron calibration fields to test or calibrate various neutron detectors being used in nuclear, medical and other industrial fields for securing their reliabilities.
   
   

   Certified reference material of brown rice for radioactive cesium analysis

   Calibration of a neutron survey meter

Development of measurement technologies based on X-rays and positrons

1. Characterization of materials using positrons
   Making use of intense, pulsed, variable energy slow positron beams we are developing new methods for the characterization of advanced materials.
2. Development of portable X-ray sources
   Using nano-structured carbon field emitter cathodes we are developing compact, powerful, X-ray sources for non-destructive testing.
3. Development of radiation dosimeters
   We have developed battery operated personal radiation dosimeters with a battery lifetime of more than one year.

1. Nondestructive inspection of social and industrial infrastructure 
   Development of x-ray backscatter imaging technique using 0.9 MeV c-band x-ray generator for nondestructive imaging of roadbed and bridge.
   
2. Measurement methods and system 
   Development of advanced radiation detection method and measurement system for ultraviolet light, soft and hard x-rays, gamma-rays, and neutrons.
   
3. Application of ultra-short pulse laser
    Laser plasma electron acceleration, laser-Compton scattering x-rays, terahertz generation and measurement using ultra-short pulse laser.
   

1. Technique for detecting flaws in materials/structures using laser ultrasound
   
2. Technique for evaluating deformation/strain distribution using Moire
   
3. Testing method for characterizing mechanical properties of carbon
   fibers/materials at high temperatures
   

ultrasonic flaw detection

Moire measurement

Tensile fixtures for elevated temperature tests

1. R&D of technologies for mass spectrometry of nanomaterials
   We conduct R&D of technologies for mass spectrometry, using laser and ion beams, and structure analysis using mass spectrometry.
2. R&D of technologies for measurement, analysis and evaluation of nanomaterials processing
   We conduct R&D of technologies for measurement, analysis, and evaluation of macroscopic and microscopic states of gas during nanomaterials processing.
3. R&D of technologies for diagnostics and monitoring of biological bodies and environment
   We conduct R&D for technologies of tomographic imaging with light interference.

　
Left: Laser Resonance Ionization Mass Spectrometer. Right: Instrumentation for Spectral-Intensity Dispersion-Canceled Optical Coherence Tomography.