Comparison of dose distributions measured with different detectors in large and small radiation fields

The study investigates the dose distributions in large (10 cm × 10 cm) and small (1 cm × 1 cm) radiation fields, comparing calculated and measured data using two detectors. Special attention is given to the impact of source occlusion in small fields and the phenomenon of penumbra overlap, as predicted by theoretical models. Small radiation fields, crucial in clinical radiation therapy, present unique challenges in dosimetry due to these effects. The results highlight the discrepancies between large and small fields, emphasizing the importance of precise measurement and the limitations of current dosimetric equipment in small-field applications.