Abstract
The enhancement of Lexan by ultraviolet radiation is a well-known phenomenon. Henke et al. (1970) have shown that the most effective wavelengths are between 310 and 370 nanometers. In our apparatus we have used 40 watt fluorescent lamps which emit only between 300 and 400 nanometers. The generally-used 1000 watt mercury vapor lamps emit about 60 watts in the same wave band, and the remaining power output only serves to heat the Lexan. Out apparatus consists of an inner stationary cylinder to which are attached 58 fluorescent lamps, surrounded by a rotating outer cylinder on the inner surface of which the Lexan sheets are mounted. The need for irradiation of both sides of the Lexan has been eliminated because the inner mounting surface of the outer cylinder is aluminized mylar with a high reflectivity. Data on the enhancement characteristics of this apparatus will be presented.
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