There are different ways to measure UV radiation. The mosty common one is by using an index number, which gives the approxiate danger level for humans. This index number is a result from taking different wavelengths into account, shorter wavelengths being more dangerous to cell structure than longer ones.
A better way however is to give the mW/(nm m2) (milliwatt per square meter per nanometer of wavelength).
For the exact calculations and more information, see:
http://www.epa.gov/sunwise/uvicalc.html
http://en.wikipedia.org/wiki/Ultraviolet_index#Definition
UV RAYS!!! The sun is the major natural source of UV Rays. UV Rays are invisable. They are still a form of light rays. UV stands for Ultra Violiet Rays. These (UV) rays cause sunburn and damage the eyes. Overexposure of UV Rays can cause serious skin cancer. UV Rays, however, can have useful effects, too. They can destroy harmful organisms. UV RAYS!!! The sun is the major natural source of UV Rays. UV Rays are invisable. They are still a form of light rays. UV stands for Ultra Violiet Rays. These (UV) rays cause sunburn and damage the eyes. Overexposure of UV Rays can cause serious skin cancer. UV Rays, however, can have useful effects, too. They can destroy harmful organisms.Utraviolet rays
UV rays
UV energy is in UV rays. These are high energy rays.
The UV rays are of three types. they are UV-A, UV-B, UV-C.
The rays filtered by the ozone are UV rays. The UV rays are extremely dangerous radiations. These radiations can cause skin cancer to living organisms.Ultraviolet(UV) rays
Ozone affects UV rays. These are harmful rays of the sun.
Yes, UV light and UV rays refer to the same thing - ultraviolet radiation. UV radiation is a type of electromagnetic radiation that is not visible to the human eye. UV light or UV rays are terms used to describe this form of radiation.
UV rays are harmful rays of the sun. They are absorbed by the ozone layer.
Scientists fear UV rays. It is because they are fatal rays of the sun.
Ozone in the atmosphere absorbs UV rays.
Ultraviolet (UV) light bulbs emit UV rays.
UV rays are high energy rays. They are influenced by ozone layer.