. Biophysics: concepts and mechanisms. Biophysics. 236 BIOLOGICAL EFFECTS OF IONIZING RADIATIONS and appreciated, especially by medical people. The three most important facts are: (1) Living tissue is killed. (2) Mutations, which may lead to cancer or to progeny which cannot live in the environment, can occur. (3) The central nervous system can become hypersensitized; and this could lead to a whole host of nervous and "somatopsychic" disorders. Radiolo- gists understand much about (1); something, but really far too little, about (2); and at this date have only an inkling about (3)..
. Biophysics: concepts and mechanisms. Biophysics. 236 BIOLOGICAL EFFECTS OF IONIZING RADIATIONS and appreciated, especially by medical people. The three most important facts are: (1) Living tissue is killed. (2) Mutations, which may lead to cancer or to progeny which cannot live in the environment, can occur. (3) The central nervous system can become hypersensitized; and this could lead to a whole host of nervous and "somatopsychic" disorders. Radiolo- gists understand much about (1); something, but really far too little, about (2); and at this date have only an inkling about (3).. Figure 9-2. Man's Environment of Radiations. Normal background of ionizing radia- tions varies widely in the range to roentgens/yr, depending upon his location, natural shielding in his home, etc. Anything above r/week is currently considered "; DOSIMETRY Dose Units From the point of view of effect, the most important quantity is the rather empirical one—the rem (roentgen equivalent man). One rem is defined as that amount of damage to tissue caused by radiation of any type which pro- duces the same biological effect as does 100 ergs absorbed per gram of tissue from incident X or gamma radiation. Since one rad (radiation absorbed dose) is defined as that amount of X or gamma radiation which, when ab- sorbed, adds 100 ergs per gram (, x 1013 ev/g) to the energy of the tissue, one rem of damage is produced by 1 rad of absorbed X or gamma Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Casey, Edmund Jeremiah, 1924-. New York, Reinhold Pub. Corp
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