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Article
Radiology, Nuclear Medicine & Medical Imaging
The NMIJ air kerma primary standard for high energyx-ray beams in 300-450 kV
Junya Ishii et al.
Summary: This passage discusses the calibration of radiation dosimeters and dose-rate meters by the National Metrology Institute of Japan using a cylindrical graphite-walled cavity ionization chamber, extending the energy range of x-ray reference field measurement. Evaluation of deviations from the Spencer-Attix cavity theory was done by comparing measurement results with free-air ionization chambers, showing consistent calibration coefficients in the energy range of 300-450 kV.
BIOMEDICAL PHYSICS & ENGINEERING EXPRESS (2022)
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