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PHYSICAL RESEARCH 37 or Russian, at $26.06 per print, including shipping case, F.O.B. Washington, D. C. English version available for loan (free) from USAEC headquarters and field libraries. Cleared for television. When a substance is irradiated with neutrons, minute quantities of radioactive elements are produced. By measuring the quantity and en- ergy spectrum of the radiation produced, we can obtain an extremely sensitive and precise measurement of the elements present. This technical film describes the general techniques, applications, and sensitivities of this powerful analytical tool. NEUTRON ACTIVATION ANALYSIS (1964). 40 minutes, color. Produced for the USAEC by the General Atomic Division, General Dynamics. For sale by McNamara Productions, at $121.22 per print, including shipping case, F.O.B. Los Angeles. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. This technical film deals with the nature, potentialities, and applica- tions of neutron activation analysis — a highly sensitive and powerful analytical technique that has grown out of the study of peaceful uses of nuclear energy. It is a method of analyzing samples for various ele- ments by bombarding them with neutrons to make some of the elements radioactive, and then identifying and measuring the induced radioactivi- ties to complete the quantitative analysis. The film shows the kinds of neutron sources used (isotopic, accelerator, and nuclear reactor), the latest counting techniques employed (especially those of multichannel gamma-ray spectrometry and spectrum stripping), and illustrates the wide applicability of the method to many kinds of problems, samples, and studies. Both activations with thermal neutrons and with fast neutrons are shown. The purely instrumental, nondestructive form of the method and also the form involving radiochemical separations with carriers are illustrated. The microgram-to-milligram sensitivities attainable with low-cost accelerator neutron sources and the sub-nanogram to microgram sensitivities achieved with a modern pool-type research reactor are reviewed. The high speed of the instrumental method is stressed, and the possibilities of automation and computer calculation are presented. Interesting examples of recent applications of the method in the fields of scientific crime detection, geology and geo- chemistry, agriculture, medicine, the petroleum and chemical in- dustries, and the semiconductor industry are shown. NEUTRON DIFFRACTION (A Geneva-1964 film). 9 minutes, color. Produced by Argonne National Laboratory. For sale by Byron Motion Pictures in English, French, Spanish, or Russian, at $28.18 per print, including shipping case, F.O.B. Washington,