J Med Phys Close
 

Figure 1: One of the films used for the measurement of the small fields. Six calibration fields (50, 170, 250, 320, 400, and 520 cGy) together with four fields of sizes 0.5 × 0.5 cm2, 0.7 × 0.7 cm2, 1 × 1 cm2, and 2 × 2 cm2 were used (these fields can be seen, for instance, in first row and columns 7, 8, 9 and 10 respectively). Each field was used to irradiate 10 film segments, and the readings of these 10 segments are averaged to minimize film inhomogeneities

Figure 1: One of the films used for the measurement of the small fields. Six calibration fields (50, 170, 250, 320, 400, and 520 cGy) together with four fields of sizes 0.5 × 0.5 cm<sup>2</sup>, 0.7 × 0.7 cm<sup>2</sup>, 1 × 1 cm<sup>2</sup>, and 2 × 2 cm<sup>2</sup> were used (these fields can be seen, for instance, in first row and columns 7, 8, 9 and 10 respectively). Each field was used to irradiate 10 film segments, and the readings of these 10 segments are averaged to minimize film inhomogeneities