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Research Groups

Acoustics and Ultrasonics Standards Group

Development, dissemination and maintenance of primary acoustic and ultrasonic standards, and development of precise measurement technology based on the standards
Research Themes
  1. Development of sound power level standards
    OPrecise calibration technique of reference sound source for evaluating sound power level of office automation apparatus etc.
  2. Development of primary ultrasonic pressure standards

    Precise calibration technique of hydrophone sensitivity for evaluating ultrasonic medical apparatus

  3. Development of quantitative measurement technique on ultrasonic cavitation

    Quantitative measurement technique on ultrasonic cavitation for evaluating high-power ultrasonic cleaning equipment

Calibration system of reference sound source
Ultrasonic cavitation sensor developed for high resolution (outer diameter is 5 cm)

Ionizing Radiation Standards Group

Development of national dosimetry standards and relevant measurement technologies
Research Themes
  1. Development of dose standards for medical radiological equipments
    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

Radioactivity and Neutron Standards Group


Development of activity and neutron standards and their calibration services.
Research and development of measurement techniques of activity and neutron.
Research Themes
  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.

X-ray and Positron Measurement Group

Development of measurement technologies based on X-rays and positrons

Research Themes
  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.

Nanoscopic Measurement Group

Research development of measurement technologies in nanoregion using electron beam​ and ion beam as probes
Research Themes
  1. New elemental technologies on microscopy and mass-spectroscopy
  2. Development the electron microscopy technique for risk assessment of nanomaterials
  3. International standardization of measurement technique for nanomaterials
Real surface probe microscope (RSPM)
Electron micrograph of the rat alveolus macrophage which let you inhale multilayered carbon nanotube

Radiation Imaging Measurement Group

Quantum Radiation Measurement and Radiation Imaging technology
Research Themes
  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.

Non-destructive Measurement Group

R&D of non-destructive measurement technique through image analysis
Research Themes
  1. Technique for detecting flas 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

Nanoscale Spectroscopic Measurement Group

R&D of optical and spectroscopic measurement technology in the nanoscale region using a laser beam or other light sources
Research Themes
  1. Absorption of light: Development of a highly space- and time-resolved laser spectroscopy and its application to material analysis
    We are developing a transient absorption spectroscopy using absorption of a highly-intense and ultra-short pulsed light, applying it to the analysis of change in the state of functional materials, and developing ionization techniques and photoelectron spectroscopy with multi-photon absorption.
  2. Reflection of light: Development of infrared imaging technology with its processing
    We have succeeded in developing a night vision camera capable of shooting a motion picture in color, by realizing visualization of an invisible space with infrared reflection and image processing of its spectral characteristics.
  3. Interference of light: Advancement of a tomographic imaging technology
    Controlling intensity correlation and optical wave front, we are aiming at establishing imaging technology in a deeper region with more high-definition.

Night vision measurement with the developed infrared imaging technology.
Left: Image by a conventional night vision camera. Right: Image by the developed night vision camera.