Figure 6.

Sensitivity parameter (m) variations with radiation scatter conditions (field size and depth) as a ratio to the 8‐field method (fixed radiation geometry). The parameter ($P_s$) is constant for each batch of film. The error bar of $\pm 1\%(\pm \hspace{0.17em}1\sigma$) is shown for $20\times 20\hspace{0.17em}{\text{cm}}^2$ field. For other points, the estimated error is less than 1% because more data points were acquired for the calibration curve.