Activities ensuring the reliability of radiation measurements

Facility for calibration of radiation detection instruments

Gamma-ray fields

It is important to use radiation-measuring instruments that are calibrated by calibration fields traceable to national standards.
The Facility of Radiation Standards (FRS) provides various calibration fields using X-ray generators, gamma-ray irradiators, beta and neutron sources, and an accelerator. These fields are also used for type-tests of radiation-measuring instruments and research and development in radiation dosimetry.

Gamma-ray fields
Gamma-ray fields

X-ray fields
X-ray fields

Neutron fields
Neutron fields

Determination of the radioactivity in various samples

Germanium detectors, gas-flow-type proportional counters, and liquid scintillation counters, shown in the images below, are used to determine radioactivity in samples such as air filters, water, soil, and foods, obtained in and around the Nuclear Science Research Institute and the J-PARC.
These instruments have also been used to measure many samples (air filters, soil, seawater, etc.) around the Fukushima Daiichi Nuclear Power Plant.

Germanium detector with sample changer
Germanium detector with sample changer

Gas-flow- type proportional counter for alpha- and beta-ray measurements
Gas-flow- type proportional counter for alpha- and beta-ray measurements

Germanium detector for gamma-ray analysis
Gas-flow-type proportional counter for alpha- and beta-ray measurements

Liquid scintillation counter for low- energy beta-ray measurements
Liquid scintillation counter for low-energy beta-ray measurement

Copyright(C) Japan Atomic Energy Agency. All Rights Reserved.