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Article
March 1936

MEASUREMENTS OF THE DEPTH DOSE FOR ROENTGEN THERAPY USED IN DERMATOLOGIC PRACTICE

Author Affiliations

NEW YORK

From the Department of Dermatology, Vanderbilt Clinic, College of Physicians and Surgeons, Columbia University, New York.

Arch Derm Syphilol. 1936;33(3):446-456. doi:10.1001/archderm.1936.01470090036003
Abstract

In most diseases of the skin that are amenable to roentgen therapy the chief pathologic changes occur in the upper portion of the cutis, usually at a depth of a few millimeters from the surface. Less often there is involvement of the deeper portion of the cutis or subcutaneous areolar tissue. Since even then the pathologic changes seldom take place at a depth over 1 cm., we endeavored to determine the depth dose of x-rays of the qualities ordinarily used in dermatologic therapy at each millimeter below the surface of the skin.

It was obvious that the ordinary thimble type of ionization chamber, successfully used for measurements at greater depths, was unsuited for this purpose. We therefore were forced to devise other methods, and of these the inclined film arrangement proved the most satisfactory. Our results are based on measurements made by this method.

At first, measurements of direct absorption

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