Fig. 3.

Relative scintillation intensity for 6 MV (top), 6 MV FFF (middle), and 10 MV FFF (bottom) measurements standardized with respect to gain, frame rate, and dose rate as a function of dose rate. Individual series represent different combinations of gain and frame rate. Three distinct levels at each dose rate represent 1 × 1 cm², 3 × 3 cm², and 5 × 5 cm² field sizes. Circle, square, and triangle markers represent 18 dB, 20 dB, and 22 dB gains, respectively. Unfilled and filled markers represent 10 fps and 20 fps frame rates, respectively. Data is normalized to beam-specific measurements at 20 fps, 20 dB, 600 MU/min, and 3 × 3 cm² field size.