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78 UNDERSTANDING THE ATOM SERIES ALPHA, BETA, AND GAMMA (1962). 44 minutes, black and white. Produced by the former New York University Television Center under the direction of the USAEC's Division of Isotopes Devel- opment. For sale by Byron Motion Pictures, at $47.12 per print, including protective film treatment and shipping case, F.O.B. Washington, D. C. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. 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 nuclei. 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, black and white. 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. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. 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. Overman, Chairman, Special Training Division of the USAEC's Oak Ridge Institute of Nuclear Studies and regular lecturer of the series. Dr. Seaborg outlines briefly the types of experiments which were used in the production of transuranium elements. These have been dis- covered using exceedingly ingenious approaches involving quite com- plex electronics and highly refined chemical techniques. Various sources have been employed in producing the new elements. These have included various types of accelerators, uranium reactors, and in several cases the first production of elements was in weapons testing experiments. The higher atomic number elements have been produced by the bombardment of targets with nuclei such as boron and nitrogen. Dr. Seaborg points out that elements not yet discovered will be char-