Quanta. CRLR - 512 - STUDY OF THE ATTENUATION OF THERMAL RADIATION BY FOG-OIL SMOKE SCREENS (U). Charles W. Forsthoff, 25 October 1955. SECRET-RESTRICTED DATA, Special Report (U) The objectives of the work described in this report were to (1) assemble in tabular and graphical form the information necessary to establish the logistical requirements and (2) predict the results to be accomplished by the employment of fog-oil smoke screens for attenuating thermal radiation. Tem (U) Two methods are developed for determining the attenuation of thermal radiation from nuclear weapons by fog-oil smoke-screen operations, One method is based on experimental data from laboratory and nonatomic field tests. The other method utilizes information derived from theoretical studies. In general, both the experimental and theoretical methods NG. indicate that a high degree of thermal protection can be obtained for personnel in the area between the maximum radius of 8 lb/sq in. and . 3 cal/sq in. Current smoke-screening doctrine developed for visual or Se verhead aerial obscuration is, in general, adequate for thermalradiation-attenuating purposes. CRLR - 530 - ev; ee RADIOLOGICAL DIVISION RESEARCH AND DEVELOPMENT PLAN FOR PERIOD 1955 THROUGH 1965 (U). Radiological Division. k November 1955. SECRET-RESTRICTED DATA, Special Report Mev. ¢ The Radiological Division research and development plan for 55 to 1965 is presented. It is divided into two broad categories: offensive RW and atomic and radiological defense. Conclusions and recommendations are presented with regard to each program. CRLR - 561 - ABSOLUTE BETA MEASUREMENT OF MIXED NUCLIDES (U). Fletcher Gabbard, Arnold Berman, and David Rigotti, 9 March 1956. UNCLASSIFIED, Interim Report (u) This report describes the applicability and efficiency of an absolute beta-counting system for sources composed of mixed radionuclides.