Evaluation of the air kerma rates stability used in diagnostic radiology calibration

Abstract

The objective of this work was to perform tests in order to evaluate the stability of the air kerma rates measured with the dosimetric reference system of the calibration laboratory of IPEN (LCI)). The diagnostic radiology reference system consists of a parallel plates ionization chamber with volume of 1cm3 , PTW, model 77334, connected to a PTW electrometer, model UNIDOS, type 10001, and it is used a 14C as check source. This parallel plate ionization chamber can be also used for radiography and fluoroscopy modes measurements during the characterization of the diagnostic radiology beams. The air kerma rates obtained during the calibration measurements were are evaluated from 2005 to 2007.