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The representation of a light beam such as an electromagnetic wave or a collection of photons is very useful to understand how light interacts with matter. However, in describing light in the atmosphere, we are primarily interested in the flow of energy.

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spectral distribution in the UV range

Ultraviolet (UV) irradiation is an electromagnetic irradiation whose wavelength (100-400 nm) is shorter than that of visible light (400-700 nm), but longer than X-rays < (100 nm).   UVC irradiation (200-280 nm).

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Dosage of exposure to ultraviolet rays

The degree of inactivation by ultraviolet rays is directly related to the UV dose applied.

the dose is the product of the UV intensity [I] (expressed in energy per unit area) and the exposure time [T].

Therefore: DOSE = I x T

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