Reproductive Capacity of Mammalian Tumour Cells Irradiated in vivo with Cyclotron-produced Fast Neutrons

Abstract
The reproductive capacity of isologous P-388 leukemic cells has been determined in-vivo after irradiation with fast neutrons from the M. R. C. cyclotron, Hammersmith Hospital. When tumor-bearing donor animals are irradiated at 10 cm depth in tissue-equivalent phantom material, using a relatively narrow last neutron beam, the results are indistinguishable from results when donor animals are irradiated in air using a wide neutron beam. Implications of this finding for radiotherapy of human tumors are discussed.