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Phototherapy


Dosed effects on the body of infrared, visible and ultraviolet radiation.
Radiant energy is emitted by any body at a temperature above absolute zero. At a temperature of 450-500 ± C, the radiation consists only of infrared rays. A further increase in temperature causes the emission of visible light - red and white heat. At temperatures above 1000 ± C, ultraviolet radiation begins. The sun is a natural source of all types of radiation - from infrared to short-wave ultraviolet. In artificial caloric emitters, incandescent filaments heated by electric current are used. They are used as sources of infrared and visible light. To obtain ultraviolet radiation in physiotherapy, fluorescent, for example, mercury-quartz lamps are used.
The biological effect of light radiation depends on the degree of penetration into the tissue. The longer the wavelength, the stronger the effect of radiation. Infrared rays penetrate into the tissue to a depth of 23 cm, visible light - up to 1 cm, ultraviolet rays - 0.5-1 mm.






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