Liquid Scintillation Counting of C¹⁴ and H³ Labeled Amino Acids and Proteins, M. Vaughan and others, _Science_, 126: 446 (Sept. 6, 1957). Phosphorescence in Liquid Scintillation Counting of Proteins, R. J. Herberg, _Science_, 128: 199 (July 25, 1958). Suspension Counting of Carbon-14 in Scintillation Gels, B. L. Funt and A. Hetherington, _Science_, 125: 986 (May 17, 1957). Liquid Scintillation Counting of Aqueous Solutions of Carbon-14 and Tritium, J. Shapira and W. H. Perkins, _Science_, 131: 414 (Feb. 12, 1960). Alone in the Dark with a Panic Button: Purdue’s Whole Body Counter, Martin Mann, _Popular Science_, 181: 90 (October 1962). Counter as a Test Instrument, W. H. Bucksbaum, _Electronics World_, 68: 48 (November 1962). Spiral Capillary Plastic Scintillation Flow Counter for Beta Assay, B. L. Funt and A. Hetherington, _Science_, 129: 1429 (May 22, 1959). Motion Pictures Available for loan without charge from the AEC Headquarters Film Library, Division of Public Information, U. S. Atomic Energy Commission, Washington, D. C. 20545 and from other AEC film libraries. _Understanding the Atom: Radiation Detection by Scintillation_, 30 minutes, black and white, sound, 1962. Produced by the Educational Broadcasting Corporation under the direction of the AEC’s Division of Isotopes Development. This semitechnical film describes the scintillation process. Solid and liquid scintillators are shown, a description of a photomultiplier is given, and the pulse-height analyzer principle is illustrated. _Human Radioactivity Measurements_, 9 minutes, color and sound, 1958. Produced by AEC’s Los Alamos Scientific Laboratory. This film shows a method developed at LASL to monitor possible intake of radiation by personnel. The liquid scintillation counter is large enough to contain a man and sensitive enough to detect even the minute amounts of his natural gamma radioactivity. _Ionizing Radiation in Humans_, 15 minutes, color and sound, 1958. Produced by AEC’s Argonne National Laboratory. Describes the design and operation of ANL’s whole body counter for determining identification, quantity, and location of internally deposited radioelements. Various techniques in accumulation of data are shown. _Liquid Scintillation Counting_, 14 minutes, color and sound, 1958. Produced by the Jam Handy Organization for the U. S. Atomic Energy Commission. Describes the use of a liquid scintillator for counting low-energy beta emitters commonly used in biological and medical tracer experiments. Also describes counting techniques, how the counters work, and how a sample is prepared. PHOTO CREDITS