The Relative Biological Efficiency of 20-Mev Electrons and 180-Kvp X-Rays in Escherichia coli Inactivation

Abstract
The relative biological efficiency (RBE) of 20-Mev electrons as compared with 180 kvp X-rays was determined from dose-survival curves for E. coli B/r, irradiated in the resting state. Absorbed doses produced by the 180-kvp X-rays were measured with the Fricke ferrous sulfate dosimeter on the basis of Victoreen chamber measurements with appropriate correction and conversion factors applied. The absorbed dose of electrons was determined with the Fricke ferrous sulfate dosimeter, and a G value of 15.5 molecules of ferric ion produced per 100 ev. The RBE was 0.82 [plus or minus] 0.01 with E. coli B/r.

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