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UNDERSTANDING THE ATOM SERIES 81 Produced by the Educational Broadcasting Corporation, New York City, under the direction of the USAEC's Division of Isotopes Development. For sale by Byron Motion Pictures, at $31.77 per print, including shipping case, F.O.B. Washington, D. C. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. A short review of gamma interactions with matter is shown, with particular reference to useful scintillation crystals. The scintillation process is described, and the efficiency of the conversion of gamma radiation to visible light in the scintillator is discussed. Solid and liquid scintillators are shown along with special detection devices using this principle. A description of the operation of a photomultiplier tube is given, and the concept of pulse height is developed. The prin- ciple of operation of a pulse-height analyzer is shown, and the spec- trum obtained with such an instrument is shown and discussed. Brief mention is made of solid-state radiation detectors. RADIQISOTOPE APPLICATIONS IN INDUSTRY (1964). 2Q 1 /^ minutes, black and white. Produced by the Educational Broadcasting Corporation, New York City, under the joint direction of USAEC's Divisions of Isotope Development and Nuclear Education and Training. For sale by Byron Motion Pictures, at $28.98 per print, including shipping case, F.O.B. Washington, D. C. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. This film discusses some of the practical, simple, and easily under- stood methods of putting radioisotopes to work in industry. The program features Dr. Paul C. Aebersold, Director, Division of Isotope Development, USAEC, who is introduced by Dr. Ralph T. Overman, Chairman, Special Training Division of the USAEC's Oak Ridge Insti- tute of Nuclear Studies and regular lecturer of the series. Using actual radioisotope sources, Dr. Aebersold gives various demonstra- tions of the degree of their penetrating radiations, the extent to which several types of materials can reduce them and the sensitive methods of detecting them. He explains how the principles involved in the demonstrations are applied to practical uses in industry. Narrating over film, he tells of the actual use of radioisotope gauges in tire plants and steel mills, of radioisotope tracers used in the petroleum and chemical industries, of radioisotope density gauges used in food plants and of other uses of radioisotopes in industry which improve the efficiency of production and the quality of the product. RADIOISOTOPE APPLICATIONS IN MEDICINE (1964). 26 minutes, black and white. Produced by the Educational Broadcasting Corporation, New