sl DOE HEALTH AND MORTALITY STUDY To determine mortality of all DOE and DOE contractor workers and establish data base for prospective health study of employees and contractors. $2 MANCUSO HEALTH AND MORTALITY STUDY BIOLOGICAL EFFECTS OF IONIZING RADIATION L. Hempelman, University of Rochester Project includes medical follow-up of 25 plutonium workers with high depositions STUDIES OF POPULATION IN HIGH BACKGROUND AREA P. Franco, Brazil Studies of population living in areas of high natural background CHEST FLUOROSCOPY AND NEOPLASIA M. C. Battigelli, University of North Carolina Incidence of neoplasia in tuberculosis patients subjected to repeated fluoroscopy for pneumothorax and pneumoperitoneum