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38 PHYSICAL RESEARCH D. C. English version available for loan (free) from USAEC headquarters and field libraries. Cleared for television. The wavelengths of thermal neutrons are comparable to X rays used in the study of crystal structures and produce similar diffraction effects. Since the scattering processes are different, neutron diffrac- tion studies provide information which cannot be obtained by other methods. They are particularly useful for determining the positions of light atoms in the crystal structure and provide a unique technique for the study of magnetic orientation. This technical film describes the principles of neutron diffraction and indicates new fields of investiga- tion which previously were considered not feasible. NEUTRON IMAGE DETECTOR (1965). 5V 2 minutes, color. Produced by the USAEC's Argonne National Laboratory. For sale by Color Service Co., at $12.76 per print, including ship- ping case, F.O.B. New York City. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. In a number of areas of nuclear research it is necessary to detect and visualize the distribution of neutrons. Like X rays, the penetrating characteristics of neutrons can be used for radiography. However, the absorption characteristics of neutrons and X rays are quite different and this makes neutron radiography a very valuable technique. The film describes a new vacuum tube developed by the Argonne National Laboratory Metallurgy Division and the Rauland Corporation, a sub- sidiary of Zenith Radio Corporation. The tube contains a neutron- sensitive screen one foot in diameter. It produces a brilliant image which may be viewed with a closed circuit television camera. Applica- tions of the tube to neutron radiography and neutron motion pictures are illustrated. THE NUCLEAR WITNESS—ACTIVATION ANALYSIS IN CRIME pT VESTIGATION See page 26 PRACTICAL PROCEDURES OF MEASUREMENT (Radioisotopes Series) See page 76 PROPERTIES OF RADIATION (Radioisotopes Series). . See page 76 PROPERTIES OF RADIATION (Understanding the Atom Series) . . . See page 79 RADIATION AND MATTER (Understanding the Atom Series) .... See page 80 RADIATION DETECTION BY IONIZATION (Understanding the Atom Series) See page 80