日光或紫外线(UVR)能够引起皮肤癌早已为人们所熟知。近几年来,对 UVR 致癌的物理、生理、生化以及理论和临床研究等方面,又有了一些新的进展。一、UVR 致癌的光谱日光对皮肤的致癌作用,是在它所辐射光谱的 UVR 部分,并且主要是其中波段(UVB)以下部分,一般认为,240～320nm是致癌波段。320nm 波长的量子能是6.2× It has long been known that sunlight or ultraviolet rays (UVR) can cause skin cancer. In recent years, there have been some new advances in the physical, physiological, biochemical and theoretical and clinical studies of UVR carcinogenesis. 1. UVR carcinogenicity The carcinogenic effect of sunlight on the skin is in the UVR part of the radiation spectrum it radiates, and it is mainly in the lower part of the UVB band. It is generally believed that 240-320nm is a carcinogenic band. The quantum energy at 320nm wavelength is 6.2×