At what distance are ultraviolet rays typically applied from the skin?

Ultraviolet rays are generally applied to the skin from a distance of 30 to 36 inches. This distance is crucial as it helps to ensure that the rays effectively penetrate the skin without causing excessive exposure or potential damage. The distance allows for an even distribution of UV rays, making treatments safer and more effective while minimizing the risk of burns or overexposure.

When applied at this distance, the therapeutic benefits of UV rays, such as enhancing vitamin D production or treating certain skin conditions, can be maximized. Distances shorter than this may increase the intensity and the risk of damaging the skin, while distances longer than this could lead to insufficient exposure to achieve the desired effects.