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The present work is a theoretical/computer simulation study aimed atinvestigating the dependence of the w value in air on the initial energy of theionizing electrons. The current assumption of a constant w value underpins theaccurate determination of absorbed dose in megavoltage radiotherapy. Thetransport of electrons in the energy range between 1 keV and 10 MeV has beenstudied using the EGSnrc Monte Carlo code system. We have extended the electrondegradation spectra calculations down to 200 eV by solving an integral equationderived from the cavity integral formulation for the absorbed dose. The presentstudy confirms the constancy of the w value in the megavoltage energy rangethough our calculation method is not capable of accurately predicting itsabsolute value. When the average electron energy falls below several keV, it iswell known that w exhibits an increase in its absolute value which ourcalculations also indicate.

Average energy required to produce an ion pair, revisited