Calibration of ionization chambers in air kerma length.

  title={Calibration of ionization chambers in air kerma length.},
  author={François O. Bochud and M Grecescu and J. F. Valley},
  journal={Physics in medicine and biology},
  volume={46 9},
Pencil ionization chambers are employed for the direct determination of the computed tomography dose index (CTDI), which is used for patient dosimetry in CT examinations. The chambers are calibrated in air kerma length in a reference x-ray field. The precision of calibration is influenced by several factors which are investigated in the present work. It is shown that the best irradiation length is 50% of the chamber rated length. The reading must be corrected for a residual signal due to the… CONTINUE READING