A feasibility study of a phototransistor for the dosimetry of computerized tomography and stereotactic radiosurgery beams

Abstract Phototransistors have already been discussed in the literature as radiation detectors for measurements in the low energy range. If they are used in high energy X-ray beams, there is a certain loss of sensitivity to the ionizing radiation. although this effect occurs it is possible to extract the dose information from the response curve. The aim of this work is to present methods to apply phototransistors as detectors in standardized radiation beam qualities that are used in diagnostic radiology and stereotactic radiosurgery. A Pantak X-ray unit is used to generate radiodiagnostic beams and Siemens-Primus linear accelerator launches 6 MV photon radiotherapy beams under the detector. The results from thermoluminiscent dosimeter (TLD) detectors. Surface mount technology (SMT) phototransistor devices and an ionization chamber are presented to make a comparison.