UNCLASSIFIED It is concluded that: (1) The use of fission products as heat sources as a (2) No justification exists for the initiation of a develop- means of reducing the cost of waste disposal is not feasible. ment project for the recovery of heat from fission products. CWLR - 2353 - THERMAL ATTENDATION BY CHEMICAL SMOKES. J. J. Mahoney, D. D. Keough and D. T. Kilminster, January 1960. UNCLASSIFIED (u) The purpose of this investigation was to determine experimentally the relative capabilities of six smokes for protection against thermal radiation from nuclear detonations. The six smokes used were fog oil, napthalene (carbon), titanium tetrachloride (FM), chlorosulfonic acid-sulfur trioxide (FS), hexa- chloroethane (HC), and silicon tetrachloride-ammontia. A carbon arc was used as a point source of thermal radiation. Transmission of thermal radiation through various smoke concentrations and distances was measured. From the results of these experiments it was concluded that: 1. An absorbing smoke, such as napthalene (carbon), is much more effective (by a factor of about 4) than a scattering smoke in reduc~ ing thermal radiation from a 6,000°K source, for smoke concentrations of 0.5 gm/sq m (384 gai/sq mi). 2. The transmissivity values of FM, FS, HC, and silicon tetrachlcride-ammonia smokes are almost identipal (within + 5%) for any particular concentration less than 2 gn/sq m. 3. Fog oil smoke has moderately better screening properties than the FM, FS, HC, and silicon tetrachloride-ammonia smokes; its transmissivity value is about 20% less than the others for any particular concentration of smoke less than 2 gm/sq m. h, TTransmissivity values of smoke, as measured by photo- voltaic cells, are too low and are, consequently, unreliable. UNCLASSIFIED eh