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Quantitative assessment and reduction of long-term autoradiographic background

RK Traub, L Famous, R Krishnan and KR Olson

Pathophysiology Division, United States Army Medical Research Institute of Chemical Defense, Aberdeen Proving Ground, Maryland 21010-5425.

Quantitative autoradiography can measure distribution patterns in an animal exposed to radiolabeled compounds. A comparison of autoradiographs of rat brain containing low levels of 14C showed that a highly variable background signal had been produced. This resulted in several overexposed autoradiographs which could not be quantitatively compared. The background, believed to be produced by light emanating from the phosphor coating in the X-ray cassette, was a major impediment because it hindered correct analysis of the specimen. This article details our experiments demonstrating the sources of variance contributing to background and offers methods for its reduction. We found that placement of black polyethylene plastic between the slides and phosphor in the X-ray film cassette minimized autoradiographic background and effectively eliminated the effects caused by inherently different levels of radioactivity in the glass slides.

Volume 38, Issue 4, pp. 581-583, 04/01/1990
Copyright © 1990 by The Histochemical Society


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The Journal of Histochemistry & Cytochemistry is owned, published, and licensed by The Histochemical Society © 1990