In 1935 we read a paper1 before this section on the measurements of the depth dose for roentgen therapy in dermatologic practice. It was evident from the information obtained that grenz rays had such slight penetration that they could exert little direct action deeper than a fraction of a millimeter. On the other hand, the quality of roentgen rays then in widespread use by dermatologists, generated at a voltage of approximately 100 kilovolts, was found to be so penetrating that underlying healthy tissue was unnecessarily irradiated. It seemed that two extremes were being used, neither one of which approached the ideal. On the basis of our experimental work we concluded that roentgen rays of considerably lower voltage and of higher homogeneity would be the most suitable for the treatment of pathologic tissue within the first 1 or 2 cm. of depth. Our calculated values at that time
ANDREWS GC, BRAESTRUP CB, HEISEL EB. EXIT DOSE IN DERMATOLOGIC ROENTGEN THERAPY. Arch Derm Syphilol. 1944;50(6):355–360. doi:10.1001/archderm.1944.01510180003001
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