SPFaurinkosuojaa

SPFaurinkosuojaa, also known as Sun Protection Factor (SPF), is a measure of the effectiveness of a sunscreen in protecting the skin from ultraviolet B (UVB) radiation. The higher the SPF number, the greater the protection against UVB rays. SPF is determined by the amount of UVB radiation that can pass through the sunscreen compared to the amount that would pass through without any sunscreen. For example, an SPF 30 sunscreen allows only 1/30th of the UVB rays to pass through, while an SPF 50 sunscreen allows only 1/50th of the UVB rays to pass through.

It is important to note that SPF does not protect against ultraviolet A (UVA) radiation, which is responsible for skin aging and wrinkles. Therefore, it is recommended to use a broad-spectrum sunscreen that protects against both UVA and UVB rays. Additionally, SPF does not indicate the duration of protection. For example, an SPF 30 sunscreen will provide protection for only 80 minutes if the skin is not exposed to additional UV radiation.

To ensure effective sun protection, it is recommended to use a sunscreen with at least SPF 30, apply it generously and evenly to all exposed skin, and reapply every two hours or after swimming or sweating. It is also important to wear protective clothing, seek shade, and use other sun protection measures to minimize sun exposure.