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Table 1 Fluence-weighted \(\left (\bar E_{\Phi }\right)\) and energy fluence-weighted \(\left (\bar E_{\Psi }\right)\) mean energies of 6 and 10 MV photon spectra for a central circular area of 2 cm diameter and a square of 2 cm side using bin widths of 50 keV, and for a square of 10 cm side using bin widths of 1, 50 and 250 keV

From: PENELOPE/PRIMO-calculated photon and electron spectra from clinical accelerators

  Bin width 6 MV 10 MV
Field size (keV) \(\bar E_{\Phi }\) (MeV) \(\bar E_{\Psi }\) (MeV) \(\bar E_{\Phi }\) (MeV) \(\bar E_{\Psi }\) (MeV)
\(\varnothing \) 2 cm 50 1.604 2.456 3.000 4.664
\(\square \) 2 cm side 50 1.601 2.453 2.989 4.655
\(\square \) 10 cm side 50 1.542 2.398 2.760 4.471
\(\square \) 10 cm side 1 1.542 2.398 2.218 3.238
\(\square \) 10 cm side 250 1.542 2.401 2.760 4.473
  1. All the spectra are extracted from the PSF files for a 10 cm × 10 cm field