Ultraviolet Therapy

Ultraviolet (UV ) light is kind of radiation having a wavelength shorter than that of white light but longer than x-rays . It has a range of 10 nm to 400 nm

The UV spectrum is divided into three , A , B and C which are named alphabetically based on the times they were discovered . These types of ultraviolet lights have different wavelengths . UV-A which is found at the upper end of the visible spectrum , has a wavelength of 315-400 nm UV-B has a wavelength of 280-315 nm and lastly , UV-C , 100-280 nm Basically , these

divisions are made due to the different effects these types of rays do to the tissues in our body

Two of the three kinds of UV have some biological effects . UV-A and B are the rays responsible for skin reddening . These rays are responsible for the `suntans , sunburns and skin cancer . Too much exposure and absorbance of these rays can cause pain and reddening of the skin Another effect of UV-A and B is germicidal actions against bacteria . At certain high frequencies ultraviolet rays are mutagenic to bacteria viruses and other microorganisms . Lastly , ultraviolet rays are used for producing ozone . UV rays create and additional energy to create ozone The last kind of ultraviolet ray , UV-C does not have much a biological effect and so far have no applications in life

The next concept about ultraviolet rays is the action spectra . However before we could understand that , we must first know what absorbance is The concept of absorbance...