Window and Window Screens as Modifiers of Thermal Radiation Released in Nuclear Detonations

摘要

The number and distribution of ignitions in building interiors due to thermal radiation from nuclear detonation will be a function, in part, of the transmittance of windows and window screens. The spectral transmittance of clean and soiled window glass, and of new and used window screening, was determined in the laboratory. The attenuation as a function of the angle of incidence of the radiation, from 0 degrees to 70 degrees, was determined. Window glass and screens were found to be spectrally neutral in the wave length range 0.34 to 2.70 microns, the spectral band of interest in evaluating the effects of thermal radiation from nuclear detonations. The attenuation caused by soiling as a result of exposure to the atmosphere was minor and did not alter the spectral character of the transmission. The change in attenuation due to varying the angle of incidence was small for angles up to 45 degrees but increased drastically above that. Simple numerical transmission factors are recommended for several situations which cover most window glass-screen combinations to be found in urban areas. (Author)