What is meant by ultraviolet radiation?
(UL-truh-VY-oh-let RAY-dee-AY-shun) Invisible rays that are part of the energy that comes from the sun. Ultraviolet radiation that reaches the Earth’s surface is made up of two types of rays, called UVA and UVB. Ultraviolet radiation also comes from sun lamps and tanning beds.
Are ultraviolet radiation harmful?
UV exposure increases the risk of potentially blinding eye diseases, if eye protection is not used. Overexposure to UV radiation can lead to serious health issues, including cancer. Skin cancer is the most common cancer in the United States.
What is an example of ultraviolet radiation?
Ultraviolet radiation or UV radiation comes from the sun in sunlight. About ten percent of the total light output of the sun consists of ultraviolet radiation. Tanning beds and lamps also emit ultraviolet radiation. Tanning lamps and beds are also sources of UV rays.”
Why is ultraviolet radiation harmful to humans?
Exposure to UV rays can cause premature aging of the skin and signs of sun damage such as wrinkles, leathery skin, liver spots, actinic keratosis, and solar elastosis. UV rays can also cause eye problems. They can cause the cornea (on the front of the eye) to become inflamed or burned.
How is ultraviolet radiation used in everyday life?
Uses for UV light include getting a sun tan, detecting forged bank notes in shops, and hardening some types of dental filling. Hospitals use UV lamps to sterilise surgical equipment and the air in operating theatres. Food and drug companies also use UV lamps to sterilise their products.
What type of light is UV?
What is UV? It is often referred to as ultraviolet ‘light,’ but UV is a type of electromagnetic radiation with wavelengths shorter than visible light and longer than X-rays. All electromagnetic waves are measured in metres, but some wavelengths (like UV) are so small that they’re measured in nanometres (nm).
Which is the most harmful ultraviolet light to humans?
UVC
Short-wavelength UVC is the most damaging type of UV radiation. However, it is completely filtered by the atmosphere and does not reach the earth’s surface. Medium-wavelength UVB is very biologically active but cannot penetrate beyond the superficial skin layers.
How does UV radiation affect the immune system?
UV radiation suppresses the immune system in multiple ways. It inhibits antigen presentation, stimulates the release of immunosuppressive cytokines and induces the generation of lymphocytes of the regulatory subtype. The major molecular target for UV-induced immunosuppression is UV-induced DNA damage.
What are 5 harmful effects of UV rays on humans?
Depending on the amount and form of the radiation, as well as on the skin type of the individual exposed, ultraviolet radiation causes erythema, sunburn, photodamage (photoaging), photocarcinogenesis, damage to the eyes, alteration of the immune system of the skin, and chemical hypersensitivity.
What is ultra-violet radiation (UVR)?
Ultra-violet radiation (UVR) is electromagnetic energy that is invisible to the human eye, with wavelengths between 10nm and 400nm. Ultra-violet lies between visible light and x-rays in the electromagnetic spectrum.
What is the ultra-violet spectrum?
Ultra-violet lies between visible light and x-rays in the electromagnetic spectrum. The therapeutic part of the ultra-violet spectrum may be divided into: UVA and UVB are biotic, where as UVC is abiotic. The Sun emits a broad spectrum of ultraviolet radiation, including UVA, UVB, UVC.
What is UVC radiation and how dangerous is it?
A: UVC radiation is the highest energy portion of the UV radiation spectrum. UVC radiation from the sun does not reach the earth’s surface because it is blocked by the ozone layer in the atmosphere. Thus, the only way that humans can be exposed to UVC radiation is from an artificial source like a lamp or laser.
What is the erythema reaction to ultra-violet?
The Erythema reaction has been used to classify doses of ultra-violet given to patients. there are 4 degrees of erythema E1, E2, E3, and E4. Definite pink red, blanches on pressure. Pigmentation or tanning of the skin follows the erythema.
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