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 |