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The quality correction factor $k_{Q,Q_{0}}$ for electron beams was calculatedfor three thimble ionization chambers, namely, NE2571, NE2571A and NE2581A. TheMonte Carlo code PENELOPE was used to estimate the overall correction factor$f_{\rm c,Q}$ of these chambers for electron beams with nominal energiesranging between 6 and 22 MeV, corresponding to a Varian Clinac 2100 C/D. A$^{60}$Co beam was used as reference quality ${\rm Q}_0$. Also eightmonoenergetic electron beams reproducing the quality index $R_{50}$ of theClinac beams were considered. The $k_{Q,Q_{0}}$ factors were calculated as theratio between $f_{\rm c,Q}$ and $f_{{\rm c,Q}_0}$. Those obtained for theNE2571 ionization chamber show a nice agreement with those calculated by Muirand Rogers with EGSnrc. As it occurred to other ionization chambers analyzed inprevious works, the $k_{{\rm Q,Q}_0}$ factors found for the monoenergetic beamsare larger (smaller) than those corresponding to the Clinac beams at low (high)$R_{50}$ values, the differences being slightly above $0.5\%$. Finally, the$k_{{\rm Q,Q}_0}$ factors obtained in the case of the NE2571A chamber aresystematically ~0.5% below those of its predecessor chamber, the NE2571.

Computation of the electron beam quality $k_{{\rm Q,Q}_0}$ factors for the NE2571, NE2571A and NE2581A thimble ionization chambers using PENELOPE