Table 3.

Calculated average film dose from ten test films using different calibration references. The calculated average film dose in a $4\times 4\hspace{0.17em}\text{cm}$ region of interest using FilmQAPro software, triple‐channel dosimetry, using either 0 and 7.5 Gy or 0 and 13 Gy reference dose films, which are used for linear scaling of the film calibration functions to account for system variations compared to calibration film scans. The percentage difference of the film dose to the actual irradiated dose is shown in the table

	Percentage Difference of Calculated Film‐Dose from Actual Irradiated Dose, for Each Dose Level
Film Dose References for Calibration Function Scaling	5 Gy	7.5 Gy	10 Gy	13 Gy
0 and 7.5 Gy	$+0.1\mathrm{\%}$	$+0.4\mathrm{\%}$	$+1.4\mathrm{\%}$	$+2.3\mathrm{\%}$
0 and 13 Gy	$-1.0\mathrm{\%}$	$-2.1\mathrm{\%}$	$-1.1\mathrm{\%}$	$+0.1\mathrm{\%}$