Abstract
The tables of the mean restricted collision masss stopping power ratios for water, polystyrene and acrylic relative to air given in the AAPMTG‐21 protocol have been fitted to an expression with 20 coefficients using the depth in the phantom and the mean incident electron energy as two independent variables. Using these expressions, the calculatd values agree with the tabulated values with in of the cases and within in of the cases. For each of the four cylindrical chamber inner diameters, given in the protocol, the electron fluence correction has been fitted to an expression with four coefficients using the mean electon energy at depth z as an independent variable.
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