ultraviolet radiation

1. University of Halabja
College of science
Department physics
second stage
Atomic Physics
Ultraviolet Radiation(UV)
Prepared by:
Shene Aziz

2. Outline
• Define UV
• Types of UV
• Difference between types of UV
• effects of UV On skin
• Know therapeutic uses of UV

3. Define UV
• Ultraviolet is a form of electromagnetic radiation with wavelength
form 10 nm to 400 nm , shorter than x-rays. Uv radiation is present in
sunlight, and constitutes about %10 of the total electromagnetic
radiation output from the sun . Ultraviolet radiation lies between
visible light and x-rays along the electromagnetic spectrum.

4. Types of UV
• UV radiation is classified into three primary types: ultraviolet A
(UVA), ultraviolet B (UVB), and ultraviolet C (UVC). These groups are
based on the measure of their wavelength, which is measured in
nanometers (nm= 0.000000001 meters or 1×10-9 meters).

6. Difference between types of UV
• UVA rays have the longest wavelengths, followed by UVB, and UVC
rays which have the shortest wavelengths. While UVA and UVB rays
are transmitted through the atmosphere, all UVC and some UVB rays
are absorbed by the Earth's ozone layer. So, most of the UV rays you
come in contact with are UVA with a small amount of UVB.

7. effects of UV On skin
• UV rays, either from the sun or from artificial sources like tanning
beds, can cause sunburn. 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

8. Know therapeutic uses of UV
• UV radiation has been used to successfully treat a number of
diseases, including rickets, psoriasis, eczema and jaundice. This
therapeutic use cannot eliminate the negative side-effects of UV
radiation but treatment takes place under medical supervision to
ensure that the benefits outweigh the risks

9. Rickets

10. psoriasis

11. Eczema

12. Jaundice