Recent studies have shown that the incidence of melanoma skin cancer and deaths has been increased globally, where the rate of melanoma skin cancer deaths reaches 75% among the white-skinned population. However, Ultraviolet (UV) light exposure is the only known risk factor for developing melanoma skin cancer. In this study, the main concepts about the electromagnetic spectrum are introduced. The visible light bands and wavelengths are presented. The energy classifications of ultraviolet radiation are discussed. Sources of ultraviolet radiation are discussed. The optics of the skin and the interaction mechanisms of light with human skin are discussed. The relationship between ultraviolet radiation and skin cancer is discussed. And the applications and beneficial effects of ultraviolet radiation in many desplines are summarized. However, the main objectives of this study are to gain and provide knowledge about solar radiation exposure risks, benefits, and to identify factors influencing practices that increase the risk for developing melanoma.

An inspection is implemented to study MHD slip flow of viscous reactive fluid in a convectively heated porous vertical channel. The ordinary differential equation governing the flow field is solved by a semi-analytical method (perturbation series method) where suction/injection is used as a fluid controller in the channel. The results are presented graphically and discussed quantitatively with respect to various parameter embedded in the problem. It is observed that for both suction/injection, increase in Magnetic field parameter, decrease the velocity flow and skin friction.