What is an Ultraviolet Ray?
Ultraviolet rays are electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays. The name means “beyond violet” (from Latin ultra, “beyond”), violet being the colour of the shortest wavelengths of visible light. UV radiation is present in sunlight, constituting about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs and specialized lights, such as mercury-vapour lamps, tanning lamps, and black lights. Although long-wavelength ultraviolet is not ionizing radiation (it does not strip electrons from atoms and molecules), it can cause chemical reactions and cause some substances to glow or fluoresce. Consequently, the biological effects of UV are greater than simple heating effects from infrared radiation.
UV rays have different effects on human skin depending on their wavelength. UVC rays, which have the shortest wavelength and highest energy, are absorbed by the ozone layer and do not reach the ground; however, they are significant in arc welding processes. UVB rays, which have slightly longer wavelengths and lower energy than UVC rays, cause skin reddening or sunburn and play a causal role in some forms of skin cancer; they are also responsible for tanning. UVA rays, which have still longer wavelengths and lower energy than UVB rays, do not cause sunburn but can promote aging of the skin (photoaging) or suppress immune system function; both types can contribute to skin cancer formation via indirect DNA damage mechanisms involving reactive oxygen species generated by sunlight interaction with cellular substances such as DNA.
Sunlight exposure is the main source of ultraviolet radiation exposure for most people; indoor tanning devices are also significant sources for deliberate exposure.
What are the dangers of Ultraviolet Rays?
While ultraviolet radiation is essential for life on Earth, too much exposure can be harmful. The sun is the main source of ultraviolet rays, but exposure can also come from tanning beds and lamps, welding torches, and mercury lamps.
Ultraviolet rays are classified into three types based on their wavelength: UVA, UVB, and UVC. UVA rays have the longest wavelength and can pass through the atmosphere to reach the Earth’s surface. UVB rays have a shorter wavelength and are partially blocked by the atmosphere. UVC rays have the shortest wavelength and are completely absorbed by the ozone layer.
Exposure to ultraviolet rays can cause skin damage, eye damage, suppress the immune system, and increase the risk of skin cancer.
What are the benefits of Ultraviolet Rays?
Ultraviolet (UV) rays are a type of electromagnetic radiation that come from the sun and artificial sources like tanning beds and mercury lamps.UV rays are classified into three ranges — UVA, UVB and UVC — based on their wavelength.
UVA rays have the longest wavelength of the three types of UV rays, and they are associated with skin aging. They can penetrate glass and are present year-round, even during winter months and on cloudy days.
UVB rays have a shorter wavelength than UVA rays, and they are the primary cause of sunburn. They also play a role in skin cancer development. Like UVA rays, they can penetrate glass, but they are filtered out by the Earth’s ozone layer.
UVC rays have the shortest wavelength of the three types of UV rays, and they are dangerous to human health. They are filtered out by the Earth’s ozone layer and do not reach the ground.
sun protection is important because exposure to UV rays can damage your skin in as little as 15 minutes.cumulative exposure over your lifetime can increase your risk for skin cancer, premature skin aging and other damage to your eyes.
How can I protect myself from Ultraviolet Rays?
You can protect yourself from ultraviolet (UV) rays by using sunscreen, wearing protective clothing, and avoiding direct sunlight.
Sunscreen can help block UV rays, but it is not foolproof. Look for a sunscreen that has an SPF of 30 or higher and that provides broad-spectrum protection against both UVA and UVB rays. Apply sunscreen generously and reapply it every two hours, or more often if you are swimming or sweating.
Wearing protective clothing is another way to reduce your exposure to UV rays. Clothing that covers your skin completely, including long sleeves, pants, and a hat with a wide brim, can help protect you from the sun. UV-blocking swimwear is also available for both children and adults.
Finally, one of the best ways to reduce your exposure to UV rays is to avoid direct sunlight whenever possible. Seek shade under trees or umbrellas, and wear sunglasses when outdoors.