Abstract

The relative effectiveness of X radiation generated at 8 million volts and γ radiation from radium is compared in patients having treatment for cancer of the anterior part of the mouth. The onset of the mucosal reaction has been used as the indicator of biological effect. Comparison of the doses received on the mucosa on the day of onset of the reaction suggests that the RBE of 8 MV X radiation as compared with γ rays is slightly less than unity. Factors which may affect the reaction other than the energy of the radiation are discussed.

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