RADIOLOGICAL WARFARE AGENT DECONTAMINATING STUDIES OF REPRESENTATIVE ROOFING MATERIALS. Manfred Morgenthau, Joseph C. Maloney, and John U. Estes, 14 October 1953. CONFIDENTIAL = The objectives of the experiments described in this report were: o test the decontaminability of various roofing materials, such as: rolled asphalt, strip shingle, corrugated metal, and builtup roofing (contaminated with a radioactive tantalum powder) and to evaluate the feasibility of the following decontamination techniques: low-pressure (8 lb/sq in) hosing, low-pressure hosing combined with scrubbing, hosing at 24 lb/sq in, fire- pressure (40 1b/sq in) hosing, high-pressure (50 1b/sq in) hosing, hot- water (Sellers Jet) hosing at 90 lb/sq in nozzle pressure, vacuum cleaning, and dry sweeping. The decontamination effectiveness ranged from 0.9% for dry sweeping on the strip shingle to 100% for high-pressure hosing on the corrugated metal roofing. CRLR - 308 - DECONTAMINATION OF RADIOACTIVE TANTALUM DUST FROM VARIOUS © ROOFING MATERIALS BY WEATHERING. G2 Manfred Morgenthau and Murray A. Schmoke, 2 December 1953. CONFIDENTIAL The object of this experiment was to determine the decontaminating effects of weather on various roofing materials contaminated with radioactive tantalum powder. Weathering of the listed roofings for 47 days resulted in the following amounts of decontamination: Rolled asphalt Asphalt strip-shingle Builtup (tar and gravel) Corrugated steel CRLR - 319 - 92% LO% 33% 89% NONATOMIC TEST OF ATTENUATION OF THERMAL RADIATION BY FOG-OIL AEROSOLS. : Jerry J. Mahoney and Robert B. Price, 23 February 1954. CONFIDENTIAL a The purpose of this study was to measure in field tests the enuation of solar radiation by fog-oil smoke screens. The data obtained may be of value in predicting the attenuation by such screens of the thermal radiation from nuclear explosions. TYaa FTILD5 - pee eee CRLR - 307