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Simplified Procedures for Radioassay and Autoradiography of Plant Materials¹

Synopsis: Compared with the conventional end window Geiger tube, the jacketed counter for the radioassay of liquids had higher precision and counting efficiency, eliminated the need for pipetting and evaporating samples prior to radioassay, and was suitable for counting digested plant samples.

The autoradiographic technique was considerably simplified through the use of individually packed film, thus eliminating the need for light-proof equipment. Autoradiograms of corn, soybeans, tobacco, and tomato plants are presented.

² Director of Research, "Na-Churs" Plant Food Co., Marion, Ohio. The-author is indebted to Benjamin Schloss, of Nucleonic Corp. of America, and Sheldon Levy, of Keleket X-ray Corp., for their assistance in selecting the apparatus and materials for this study.

Received for publication September 9, 1958.