UVB Phototherapy

Abstract

What are ultraviolet (UV) rays?

 Ultraviolet rays are invisible to our eyes. We feel them as heat from the sunlight. These rays are what cause sunburn when we are outdoors for too long without any sun protectant. Ultraviolet rays come in two forms: UVA and UVB. Ultraviolet A (UVA) rays have longer wavelengths that can penetrate skin and cause you to tan. Ultraviolet B (UVB) rays have a short wavelength that can only penetrate the superficial layers of the skin. This leads to sunburn.