PRIVACY ACT MATERIAL REMOVED 9 after other beta burns.® Primary and secondary erythema was not observed. The lesions showed differences in latent periods before appearance on different parts of the body and appeared in roughly the following sequential order: scalp, neck, axillary region, antecubital fossae, feet, arms, legs, and trunk. The neck and scalp lesions were most common; however, a substantial num- ber of antecubital fossae lesions and foot lesions were seen. Lesions on the flexor surfaces tended to appear before lesions on extensor surfaces. These differences in latent periods did not appear to be related entirely to the dose to the skin, since severe foot lesions, presumably ‘Fig. 4.~-A, pigmented lesions of neck and antecubital fossae in 13- year-old boy (29 days after exposure). Desquamation with depigmentation of neck lesions has begun. 8, extensive lesions in 13-year-old boy at 45 days after exposure. caused by the foot receiving a larger dose of radiation, did not appear until after other less severe lesions. The first indication of a lesion was an increase in pigmentation in the form of macules, papules, and raised plaques (fig. 44). Usually these dark pigmented le- 5. Robbins, L. L., and others: Superficial “Burns” of the Skin and Eyes from Scattered Cathode Rays, Radiology 46:1, 1946. Low-Beer, B. V. A.: External Therapeutic Use of Radioactive Phosphorous: 1. Erythema studies, ibid. 47:213, 1946. Wirth, J. E., and Raper, J. R.: Chapter 12, in Biologicat Effects of External. Beta Radiation, edited by R. E. Zirkle, ed. 1, New York, McGraw-Hill Book Company, Inc., 1951. PRIVACY ACT MATERIAL REMOVED