Division of Ionizing Radiation


The Radioactivity Lab has developed five primary standard systems and six secondary standard systems, including 4πβ(PC)-γ coincidence, 4πe,x(PPC)-γ coincidence and 4πγ ionizing chamber secondary standard, etc. These standards are built to satisfy the nation’s needs for measurement and standard in medicine, energy, environment and security domains. We are updating radon and radon progenies standard to cover the radon progenies instruments...

  • Calibration Device for Radon and Radon Progenies Instrument...

    In order to calibrate measurement instruments for radon activity per volume varying over five orders of magnitude, a radon chamber (the figure on left-hand side) has been set up: it covers a volume of 2 m3 for generating reference atmosphere to...

  • Study On 4πβ(LS)-γ Absolute Measurement Method

    The 4πβ(LS)-γ coincidence counting system consisting of a liquid scintillation counter with three photomultiplier tubes for beta counter and an HPGe gamma spectrometry has been developed for the standardization of radionuclides with the β-γ...

International Cooperation

National Measurement Standards and CMCs

Primary standard of 4πα, 4πβlow level radioactivity

Primary standard of 4πβ(PC)-γ coincidence



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