British Journal of Radiology · 1971 · 10 citations · 2 references
MedicinePhysicsRadiation OncologyRadiation DosimetryRadiation PhysicsRadiobiologyAbsorbed DoseAccelerator PhysicsElectron DosimetryEquivalent DoseLow-dose Radiation EffectsRadiation TherapyClinical Electron DosimetryDose Depth CurveIonizationIonizing IrradiationIonizing Radiation DosimetryIonizing Radiation EffectsIrradiation EffectsRadiation Dose Estimation
Wessex Regional Medical Physics Department, Royal South Hants Hospital, Southampton. This letter has been stimulated by preliminary results which we have obtained using the M.E.L. SL 75 “Super” linear accelerator. We wish to draw attention to observations which are apparently well documented in the literature, but which we believe are not generally appreciated (e.g. they are not taken into account by Jackson, 1970). The finding with which we are concerned is that S.I.R. (ratio of dose at the surface to dose at the maximum in the depth-dose curve) appears to decrease with decreasing energy. This is in direct contradiction to the findings with X irradiation, and indeed is difficult to justify on a theoretical basis. Moreover, the value of S.I.R. may fall below 0·8.
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