what does uv radiation do
UV rays damage the DNA of skin cells. Skin cancers start when this damage affects the DNA of genes that control skin cell growth. There are 3 main types of UV rays: 1  UVA rays age skin cells and can damage their DNA.2  UVB rays have slightly more energy than UVA rays. 3  UVC rays have more energy than the other types of UV rays, but they donât get through our atmosphere and are not in sunlight.V rays damage the DNA of skin cells. Skin cancers start when this damage affects the DNA of genes that control skin cell growth. There are 3 main types of UV rays: 1  UVA rays age skin cells and can damage their DNA.