Extreme ultra-violet solar radiation

• Publisher: Elsevier Science
• Year: 1931
• Tongue: English
• Weight: 54 KB
• Volume: 212
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(31)90313-x

✦ Synopsis

A subject widely discussed today is the use for therapeutic purposes of the short wave-length ultra-violet rays in sunlight and in arc lamps, recognized by biologists as possessing healing value, especially in the treatment of rickets.

It has been found that common window glass shuts out some wave-lengths of sunlight that have the property of preventing rickets. Spectrum analysis shows that the constituent shut out by window glass consists of the shortest ultra-violet wave-lengths in sunlight. This constituent or component of the total incident sunlight is greatly reduced by the presence of smoke, dust, etc.

A paper which will be published in the Bureau of Standards Journal of Research for June gives data on the variation of the ultra-violet in sunlight, useful for healing purposes, as affected by atmospheric pollution (smoke, etc.), altitude of the station (Washington and Flagstaff, Arizona), humidity of the air, time of the day, and season of the year.

RELATION BETWEEN COMPOSITION AND INDEX OF

REFRACTION OF GLASS.