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Ultra-violet Radiation

Nature volume 150, page 88 (18 July 1942) | Download Citation



A SUMMARY of the uses of ultra-violet radiation with special reference to lethal effects is given by J. R. Harris in the Electrician of July 10. The 'near' ultra-violet region, 3,200 A. to 4,000 A., is used for photographic and fluorescent effects, the source generally being the ultra-violet 'black' lamp, which emits a maximum radiation at 3,650 A. The 'middle' band, 2,800 A. to 3,200 A., represents the therapeutical region which produces erythema ; lamps emitting this radiation are the so-called sunlamps and are widely used as a tonic treatment in welfare centres. Rays in the far' ultra-violet region, 2,000 A. to 2,800 A., are lethal to bacteria ; the most suitable source is the quartz mercury-vapour discharge lamp large numbers of which are used in the United States for sterilizing.

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