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PRELIMINARY COMMUNICATION

HENRY H. HAZEN, M.D.; LAURENCE C. MILSTEAD, M.D.

Arch Derm Syphilol. 1926;13(2):230-233.

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Methods of determining the dosage of roentgen rays are by no means solved problems. There are four general ways: the use of pastilles and radiometers, the arithmetical method, the electrical method and the biologic method. In America the pastilles have been discarded partly because of their poor quality, and partly because of the errors due to the personal equation in the interpretation of color changes, but chiefly because of the practical excellency of the arithmetical method. MacKee deserves the credit for the general adoption of this satisfactory scheme, based on the scientific observations of Shearer. Coolidge has made the criticism that various thicknesses of glass may result in variations of about 50 per cent, in the output from different tubes, but this criticism is largely offset by the fact that in the hand of numerous observers the epilation time in human beings is constant with many different tubes. That Coolidge's . . . [Full Text PDF of this Article]

Author Affiliations
WASHINGTON, D. C.

Footnotes
Read at the Fifty-Eighth Annual Meeting of the American Dermatological Association, Washington, D. C., May 4, 5 and 6, 1925.

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