TUMORIGENESIS BY A LONG WAVELENGTH UV‐A SOURCE

Abstract
— Albino hairless mice (Skh‐hrl) were exposed daily to radiation from a high‐power long wavelength UV‐A source (wavelengths longer than 340 nm). The irradiations lasted 2 h per day. The daily dose was 220 kJ/m2. Heavy scratching marks were observed in 13 out of 48 animals. However during the experiment 31 of the animals developed tumors of 1 mm or larger before any scratching was observed. The median induction time was 265 days for 1 mm tumors.

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