From Big Medical Encyclopedia

RADIOTHERAPEUTIC INTERVAL — the distinction in initial radio sensitivity of a tumor and surrounding normal fabrics used at radiation therapy of malignant new growths. Size P. and. depends on a complex of the factors defining processes of beam damages and a reparation of cells. The directed R.'s change and. by selective strengthening of radiation injury of a tumor and (or) preferential protection of surrounding fabrics by means of chemical, physical and other impacts is the main way of increase in efficiency of radiation therapy of tumors.

See also Radiation therapy , Beam damages , Radioprotectors , Radiosensibilization , the Radio sensibilizing substances .

Bibliography: Sincaline B. B. Radio biological bases of radiation therapy of malignant tumors, JI., 1979, bibliogr.; I r m about N e N to about S. P., etc. Biological bases of radiation therapy of tumors, M., 1976, bibliogr.