ee weet ; a, ak Determination of RB= with the Use of AKm Mouse Leukemia in Various Strains of Mice, (I, Boone, B. Rogers): Strong A strain of mice were exposed to various doses of X ray and thermal column exposures to determine an RBE, Twenty mice per point were exposed to iUU, 20U, 250, 300, 350 and 40U r or rem. radiation the mice were injected with Akm leukemia, and radiated controls were included in the study. was between 300-350 r or rem. Twenty-four hours after Adequate leukemic-injected LD,30 for leukemic takes The data is to be subjected Xo/a soholeteMov’ Classification changed to by ee U.S.E.R.D. Aes analysis. b, Zeb A ang Studies on the Coll GurfaceAus ToLLOare (B. Rorers, I, Boone): Snarktt:oes piEre Sek By ts Signet a fl fl 7 of person maxing tha change, and ate) In the growing Lactobacillus cells all the cl4 nicotinic acid in the medium is converted to Coenzyme I and II. Cells were grown for 18 hours in the presence of 0.1 microgram non-labeled nicotinic acid per ml. They were washed and resuspended in a 0.04% glucose-saline mixture to which 1 microgram of cl4 nicotinic acid had been added. At the end of one hour of incubetion at 37°C, approximately 50% of the labeled nicotinic acid had been edsorbed and converted to Ccenzyme I by the cells present. Microbiological assay of the saline supernetant indicated that the remaining 50% of the cl4 labeled compound was nicotinic acid. c. Pre-Test -Calibrations for Operation Teapot. (P, Harris): Further runs have been made, using Godiva as a source, to study film badge response to fast neutrons. in lead during and after exposure. Tn this study film packets were contained Other packets were dropped into lead at varying times after completion of exposure. Results were cenerally similar to those previously reported on other film pack exposures. In the arrangement used this time films exposed in air were above the lead container, therefore, ~¢, ‘gcattered radiation frem the floor was eliminated. eave mee Ab A rough comparison with 4 (4