[Radiobiological considerations in the selection of the dose rate of intracavitary radiotherapy].

The differences in the biological effects of either fractionated high dose-rate irradiation or protracted low dose-rate irradiation is discussed with regard to their relevance for intracavitary radiotherapy. There is no biological advantage in using fractionated high dose-rate irradiation instead of protracted low dose-rate irradiation. However, with adequate fractionation schedules, fractionated high dose-rate intracavitary radiotherapy may be as good as radium therapy.