Evaluation of High-Resolution Radiation Detectors in Small Field Radiation Measurements

Abstract

To investigate the effectiveness of high-resolution detectors in small-radiation-field output factors. Six high-resolution radiation detectors were employed: W2 and W1 plastic scintillators, MicroDiamond, MicroSilicon, Edge detectors and pinpoint 3D micro ionization chamber. The output factors were measured for different beam energies (6MVFF, 6MVFFF, 10MVFF, and 10MVFFF) and field sizes (10 × 10, 5 × 5, 4 × 4, 3 × 3, 2 × 2, 1 × 1, 0.5 × 0.5 cm2) using a Varian True Beam Linear accelerator. The analysis included percentage deviations in the output factors. A comparison of the W2 PSD with other detectors revealed that they were within 3 % agreement for output factors up to a 3 × 3 cm2 field size. However, significant differences were observed beyond a 3 × 3 cm2 area. Our study demonstrated that although the W2 PSD showed good agreement with other detectors for small-field dosimetry up to 3 × 3 cm2, discrepancies occurred beyond this field size.