Measurement of Truebeam® Head-Leakage by Optically Stimulated Uminescence/Track-Etch Passive Detectors

This work was performed in order to measure the photon and neutron head-leakage values of the TrueBeam® (TB) accelerator. Measurements are compared with the data provided by the manufacturer for TB as well as Clinac.Four higher photon energies (10MV, 10MV FFF, 18MV and 20MV) and electron energy (22MeV) are considered in this study. The electron energy used in this study was the maximum available in this machine. Optically Stimulated Luminescence (OSL) Dosimeters are used for photon head-leakage measurements. Neutron component of the head-leakage was measured using track-etch (CR-39) detectors. Both photon and neutron head-leakage values for TB machine was measured using OSL and track-etch, respectively. These results were compared with the standard values provided by the manufacturer for both TB and Clinac. The study indicates that the higher neutron head-leakage once moved towards the 20MV range of photon energy. Also, the lower head-leakage values were recorded for flattening filter free beam (10MV FFF). It was observed that the photon head leakage value for Clinac was higher, and the neutron head-leakage value was found to be slightly less than the TB values.