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To the Editor:
—Thank you for forwarding the comments of Dr. R. Kaye Scott. All of his statements are quite correct.One of the apparent disagreements arose from a misunderstanding of what my article referred to. I quote from it: "[γ-Emissions] are of little use in ophthalmology. If an isotope emitting γ-radiation is given intravenously and a Geiger-Müller tube is held over the eye, the radioactivity from the entire head 'drowns out' the radioactivity from the eye itself." This refers to the use of these isotopes in detecting tumors in the eye (as diagrammed in the original article) or in the detection of blood volume changes (as in the other diagrams). In either of these situations γ-emissions from the entire head do give rise to so much radioactivity that it is difficult or impossible to detect any changes in radioactivity originating from the eye itself. Thus they do "drown them
Bettman JW. RADIOACTIVE ISOTOPES. AMA Arch Ophthalmol. 1959;62(4):730. doi:10.1001/archopht.1959.04220040191026
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