BIPM - x-ray

X-ray dosimetry

Primary standard for low-energy x-radiation

Primary standard for medium-energy x-radiation

Reference radiation qualities for x-ray comparisons

Monte Carlo calculations of correction factors

The BIPM maintains primary standards for the determination of the quantity air kerma in x-radiation with generating potentials in the range from 10 kV to 250 kV. Two free-air ionization chamber standards cover this range: the low-energy standard operating from 10 kV to 50 kV and the medium-energy standard from 100 kV to 250 kV.

For these standards, key comparisons with those of the national metrology institutes (NMIs) are made at a series of reference radiation qualities covering diagnostic and therapy radiation beams.

a patient being x-rayed

a child being x-rayed



	Summary Primary standard for low-energy x-radiation Primary standard for medium-energy x-radiation Reference radiation qualities for x-ray comparisons Monte Carlo calculations of correction factors