4O1B815 t . ANL- 5755 ——_-- ARGONNE NATIONAL LABORATORY P.O. Box 299 Lemont, Illinois RADIOLOGICAL PHYSICS DIVISION SEMIANNUAL REPORT January through June 1957 J. E. Rose, Division Director L. D. Marinelli, Associate Division Director oyeSEER, fheA July, 1957 en: Preceding Report: ANL-5679, February 1957 Operated by The University of Chicago under J01212b Contract W-31-109-eng-38 ;