Investigation of the applicability of a special parallel-plate ionization chamber for x-ray beam dosimetry

•An ionization chamber with a novel design was characterized for x-ray beam dosimetry.•This ionization chamber was evaluated in diagnostic radiology qualities.•The characterization tests results were within the recommended limits.•Monte Carlo simulations were employed to evaluate the design of the dosimeter.•The developed prototype is a good alternative for calibration laboratories and clinics.

Diagnostic x-rays are the greatest source of exposition to ionizing radiation of the population worldwide. In order to obtain accurate and lower-cost dosimeters for quality control assurance of medical x-ray facilities, a special ionization chamber was designed at the Calibration Laboratory of the IPEN, for dosimetry in diagnostic radiology beams. For the chamber characterization some tests were undertaken. Monte Carlo simulations were proposed to evaluate the distribution of the deposited energy in the sensitive volume of the ionization chamber and the collecting electrode effect on the chamber response. According to the obtained results, this special ionization chamber presents potential use for dosimetry of conventional diagnostic radiology beams.