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HERMAN GOODMAN, M.D.

Arch Derm Syphilol. 1927;16(3):291-293.

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The physicist has divided the regions of the ultraviolet into the near, middle and far. On the basis of the physiologic responses, especially by the skin, I have made another division; I have taken two set places in the ultraviolet: one, the limit of natural sunlight which is at 2,900 Angström units; and the other, the conventional barrier of glass to the ultraviolet, which may be fixed at 3,200 Angström units. For purposes of physiology, the ultraviolet may be be divided into the intravital (from 3,900 to 3,200 Angström units), which represents the invisible ultraviolet that passes through glass; the vital (from 3,200 to 2,900 Angström units), which is the ultraviolet present in sunlight on a summer day near noon and which does not pass through glass; and the extravital (below 2,900 Angström units to the limit of penetrability of air about 2,000 Angström units).

The vital ultraviolet, as present . . . [Full Text PDF of this Article]

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