Determination of the uncertainty in the cross-calibration of an ionization chamber used in radiation therapy

Abstract

It was performed an analysis of the uncertainties involved in a cross-calibration procedure of an ionization chamber used in Sírio-Libanês Hospital, according to the methodology proposed in IAEA-TECDOC-1585, based on ISO GUM. The overall uncertainty obtained was 2,55% (coverage factor k = 2), which meant an increase of 0,04% compared to the reference ionization chamber uncertainty reported by the dosimetry laboratory of LCI-GMR-IPEN/CNEN-SP.