_ . Effects of Radiation on Living Organisms Project Title: 18. Early and Late Effects of Radiation of Different Quality and at Different DoseRate RX-03-O1- fa) Expected Results in FY 1975: (Cont'd.) way in FY¥ 1975, Radiobiological studies designed to test theories of radiobiological action critically will be continued. Studies on the carcinogenic and leukemogenic potential of neutrons particularly at low doses will be continued and extended. (Bond, Rossi) Carcinogenesis studies with neutrons will be extended to a range of neutron energies in an attempt to relate the RBE for rat mammary carcinogenesis to LET. Additional doses and dose rates of gamma radiation will be studied in regard to the possible sparing effect of lower and lower gamma dose rates. Additional methods of hormonal assay, particularly prolactin, will be developed for use in studies correlating mammary carcinogenesis with hormonal *environ- ments, . (Shellabarger) Since all of the radiation-cNs studies are long-term endeavors it is likely that budgetary problems of the Air Force and BNL will severely restrict these studies. (Carsten) 19. Description and Explanation of Major Materials, Equipment and Subcontract Items: None 20. Proposed Obligations for Related Construction Projects: ‘ - None RX-173 L1192bb