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Reviews of Internal MedicineA Primer on Radiation Hazards for Physicians
RICHARD E. PETERSON, M.D.;
JULIUS G. BARON, M.D.;
BARTIS M. KENT, M.D.;
TITUS C. EVANS, Ph.D.
AMA Arch Intern Med. 1959;103(2):308-328.
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It should be emphasized that this presentation is intended to be instructional and is subject to the limitations of present available knowledge. Attempts have been made to quote authorities, but there is no intention to submit this as a handbook or authoritative guide.
Radiation Units and Equivalents*
Roentgen (r).
—The exposure (x-rays or  -rays) causing in 1 cc. of air, under standard conditions, production of positive and negative ions, either kind of them having altogether the charge of one electrostatic unit. The roentgen is a purely physical unit and has no direct relation to absorption or biological effect of radiation.
Roentgen Equivalent Physical (rep).
—Obsolete. Exposures of any kind of radiation resulting in ionization equivalent to 83 ergs per gram of air or 93 ergs per gram of tissue.
Radiation Absorbed Dose (rad).
—The radiation energy absorbed by a small volume of tissue divided by this volume. Its unit is
. . . [Full Text PDF of this Article]
Author Affiliations
Iowa City
Radioisotope, Radiologic, and Medical Services, Veterans Administration Hospital, and Radiation Research Laboratory and Department of Internal Medicine, State University of Iowa College of Medicine.
Footnotes
Submitted for publication Jan. 17, 1958.
Units are given in general terms for the non-specialist. For exact terminology, consult National Bureau of Standards Handbook 62, Report of International Committee on Radiation Units and Measurements, 1957.
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