![]() Most of the Sun’s UVB rays are blocked out by the Earth’s atmosphere, but not all, which is why it’s important to wear sunscreen and sunglasses, and avoid prolonged exposure to direct sunlight. However, prolonged exposure to UVB can also cause sunburn, DNA damage leading to some types of cancer, and eye irritation and damage. Also known as medium-wave UV, UVB is responsible for stimulating essential vitamin D production in humans and most animals. The wavelengths in ultraviolet B (UVB) rays measure between 280–315 nm. Image Credit: jplenio, Pixabay Ultraviolet B (UVB) Ultraviolet A lamps are otherwise known as black light lamps, and have many applications in different fields, such as forensics, medicine, and biology. UVA from the sun can negatively impact the eyes. Although it can’t directly cause skin cancer or eye damage over prolonged periods, exposure to UVA can cause negative reactions in deeper skin layers, which can eventually lead to DNA damage and skin cancer. UVA rays from the sun do not get blocked by the Earth’s atmosphere.Īll kinds of UV rays cause collagen breakdown in the skin, and, therefore, will accelerate aging. Measuring between 315–400 nm, ultraviolet A (UVA) light has the longest wavelengths in the UV range. ![]() Depending on the wavelength, ultraviolet is split into three subtypes: UVA, UVB, and UVC. Ultraviolet waves measure between 10 nm and 400 nm. ![]() Artificial sources include mercury-vapor lamps, tanning beds, black lights, and electric arcs produced through the process of welding, plasma cutting, and electric discharge machining.Īrtificial UV lights are used in a wide range of commercial and industrial applications, including sanitization, water treatment, phototherapy, and more. Around 10% of the total energy output from the Sun is ultraviolet radiation, but that’s not the only source. ![]()
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