EARLY ERYTHEMA AND PIGMENTATION FROM SUPERFICIAL ROENTGEN THERAPY

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Abstract
The erythema dose is defined as that amount of roentgen radiation which when given to a small area of skin on the inner surface of the thigh or forearm will produce a faint erythema in five to seven days. This erythema eventuates in pigmentation of varying intensity and lasts for a few weeks or months. Occasionally the erythema disappears without a secondary pigmentation. In recent years the tendency to express the quantity of radiation in roentgen units (r) has greatly superseded the use of the term erythema dose. However, it is advised that both physical and biologic methods be employed in standardizing the output of an x-ray apparatus. Most dermatologists who utilize superficial roentgen therapy machines in the range of 80 to 120 kilovolts regard the erythema dose as between 300 and 400 r. During the past year when this dual standardization was attempted on a recently installed x-ray apparatus,

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