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58 UNDERSTANDING THE ATOM SERIES to explore the process. Describes, with animation, key steps in one of the experiments designed to help solve the riddle. TAGGING THE ATOM (1954). Describes the use of radioisotope "tracers" as scientific re- search tools. Shows details of radioisotope production, methods of handling, purification, and packaging. UNDERSTANDING THE ATOM Series. This series of semitechnical lecture films is designed for in- clusion in a high school senior-level chemistry or physics course, or it could be used as an introductional unit in nuclear science at the college level. The lecture-demonstration is pre- sented by Dr. Ralph T. Overman, Chairman, Special Training Division of the USAEC's Oak Ridge Institute of Nuclear Studies. ALPHA, BETA, AND GAMMA (1962). 44 minutes. Produced by the former New York University Television Center under the direction of the USAEC's Division of Isotope Develop- ment. For sale by Byron Motion Pictures, at $47.12 per print, including shipping case. The film gives some insight into the origin and nature of alpha, beta, and gamma radiation. After a short discussion of the methods of de- scribing atoms and the introduction of the energy-level concept, the lecturer introduces the potential-energy well model of the nucleus. This, together with the barrier model, is used as the frame of refer- ence for a variety of other nuclear concepts. The energetics in alpha emission and the Gamow tunneling effect are used to describe alpha- ray emission and the energy levels in the nucleus. The lecturer dis- cusses neutron absorption leading to the formation of nuclei having neutron—proton ratios differing from stable or naturally occurring nu- clei. The transformation of excess neutrons into negative beta radiation and the return to stability are considered in some detail. Similarly, gamma radiation arising from a nuclear cooling process is described. The nuclear well model is then used to introduce decay schemes. THE ATOM IN PHYSICAL SCIENCE (1964). 26 minutes. Produced by the Educational Broadcasting Corporation, New York City, under the direction of the USAEC's Division of Nu- clear Education and Training and the Oak Ridge Institute of Nuclear Studies. For sale by Byron Motion Pictures, at $33.75 per print, including shipping case, F.O.B. Washington, D. C. This film is a lecture by Dr. Glenn T. Seaborg, Chairman of the U. S. Atomic Energy Commission, who is introduced by Dr. Ralph T. Over- man, Chairman, Special Training Division of the USAEC's Oak Ridge