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Purging light

 

 Ultraviolet radiation affects all lives. Which with
 297nm wavelength affects human skin most and
 which with 270nm-280nm wavelength affects
 human eyes most.

 Right figure is the Threshold Radiation Exposure
 causing keratitis of primate eyes related to radiation
 wavelength. The lowest value is 5mj/cm2 at 270nm
 and the value is about 17mj/cm2 at 253.7nm.
 According to the data of American Governmental
 Conference of Industrial Hygienists (AGCIH), the
 Threshold Limit Value (TLV) for human eyes at 253.7 nm is 60J/m2 (6mj/cm2).

 

 

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