UVA stands for Ultraviolet A. It refers to a type of radiation from the sun characterized by relatively long wavelengths.
UVA radiation is a form of electromagnetic radiation that, along with UVB and UVC radiation, makes up ultraviolet light. While all three types of UV radiation can be harmful, UVA is generally considered less damaging than UVB, though it can still contribute to skin aging and some types of skin cancer. UVA rays penetrate deeper into the skin than UVB rays.
Here's a breakdown of key aspects:
- Source: Primarily from the sun, but also emitted by certain artificial sources like tanning beds.
- Wavelength: Longer wavelength compared to UVB and UVC.
- Penetration: Can penetrate deeply into the skin (dermis).
- Effects: Contributes to:
- Skin aging (wrinkles, sunspots)
- Some types of skin cancer
- Tanning
Therefore, when someone mentions UVA, they are typically referring to this specific type of ultraviolet radiation.
