Advances in chemical radiosensitization proceedings of a panel on modification of radiosensitivity in biological systems with particular emphasis on chemical radiation sensitization and its use in radiotherapy organized by the International Atomic Energy Agency in collaboration with the World Health Organization and held in Stockholm, 25-29 June 1973 Advances in chemical radiosensitization proceedings of a panel on modification of radiosensitivity in biological systems with particular emphasis on chemical radiation sensitization and its use in radiotherapy organized by the International Atomic Energy Agency in collaboration with the World Health Organization and held in Stockholm, 25-29 June, 1973