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UVB
UVB refers to a specific band of ultraviolet radiation with shorter wavelengths and higher energy than UVA. In common usage, it is most frequently associated with the immediate physical effects of sun exposure, specifically the redness and burning of the skin (sunburn).
In a medical or skincare context, UVB is often contrasted with UVA. While UVA penetrates deeper into the dermis and is linked to premature aging (wrinkles), UVB primarily affects the outer layer of the skin (epidermis). This distinction is crucial when discussing "broad-spectrum" protection in sunscreens, which aim to block both types of radiation.
Despite its potential to cause skin damage and increase the risk of skin cancer, UVB is also necessary for the biological synthesis of vitamin D in humans. Therefore, the term is often used in discussions regarding the balance between sun protection and health benefits.
As a technical abbreviation, it is almost always written in uppercase. It functions as a noun but frequently acts as an attributive noun (modifier) in phrases like "UVB rays" or "UVB index."
Meanings
Examples
Apply a broad spectrum sunscreen to protect your skin from UVB rays.
UVB radiation is primarily responsible for causing sunburns.
UVB radiation is primarily responsible for causing sunburns.
The dermatologist explained how UVB exposure helps the body produce vitamin D.
Make sure you wear a hat because UVB levels are very high today.
UVB rays have shorter wavelengths than UVA rays.
UVB rays have shorter wavelengths than UVA rays.
Too much UVB can damage the DNA in your skin cells.
Does this lotion specifically filter out UVB radiation?