Dosimetric measurements using radiographic film and ionization chamber in radiotherapy

The aim of the present study is to improve the efficiency of lateral scattering filters in radiographic film dosimetry at high-energy and compare it with ionization chamber (I.C.). This enables the use of radiographic film as a dosimeter characterized by many advantages over I.C. especially in dynamic radiation fields. In the present study, open radiation fields (4 x 4, 1 10, 15 x 15 and 20 x 20) cm2 and wedged fields (of 150, 300, 450 and 600 wedge angles) are chosen. Central axis and off-axis doses measured by I.C. are considered as reference measurements for radiographic films with and without lateral scattering filters. This study revealed agreement of film measurements (using lead filters) with I.C. measurements within 3%