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Ultraviolet

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Ultraviolet is the name given to the electro-magnetic radiations with wave-lenght from 100 and 400 nm., situated between the visible spectrum and the X radiations.
The ultraviolet rays are invisible and are usually classified in three conventional bands:
- UV - A Radiations (long waves) from 315 to 400 nm.
- UV - B Radiations (medium waves) from 280 to 315 nm.
- UV - C Radiations (short waves) from 100 to 280 nm.
(a gauge corresponds to a millionth of a millimetre).
The UV - A group includes the ultraviolet rays contained in the solar light in the same way it reaches the earth through the atmosphere. They can pass through most types of ordinary glass and their erythematic action is rather limited.
The UV - B group rays have a very strong erythematic and pigmentant action. Besides, they help the formation of vitamin D known for her antirachitiche properties. These rays, for whose production are necessary the so called solar lamps, are especially used for therapeutic applications.

The most efficient artificial sources of high intensity UV - C radiations consist of gaseous discharge lamps in low pressure mercury fume , which are able to provide a homogeneous monochromatic radiation of wave-lenght equal to 250 - 265 nm.
The basic UV - C radiation with maximum germicidal effect is represented by the 254 nm. spectral line (this is the point where the nucleicic acids of micro-organisms have their maximum absorption).
These kinds of radiations can cause erythemas, conjunctivitis and, because of long exposure, they are dangerous for tumour growings .
The necessity of reducing the presence of pathogenic germs in the air brings to consider the growing interest in using short wave-lenght UV - C radiations.
The UV - C ultraviolet rays are physics nature bactericides. They act producing the bacterium 's proteins denaturation or the cellular wall breach because of mechanical stress and causing, in this way, the micro-organism 's death.(destruction of DNA)
There is not only a positive effect of bacterical reduction; a considerable danger of these radiations is opposed, because they can cause erythemas and conjunctivities when they hit skin and eyes.
For this reason, common lamps which exploit the UV - C rays action, can only work without the presence of people, with an obvious reduction of germicidal effect with respect to the time.


THE GREAT ADVANTAGE OF OUR SYSTEM IS ITS ABSOLUTE LACK OF DANGER (CERTIFIED) TO MAN, DUE TO THE FACT THAT THERE IS NO RADIATION LEAKAGE FROM THE UNIT.


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