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UNDERSTANDING THE ATOM SERIES 79 acterized by very short half lives and will require electronic means for their testing rather than chemical techniques. The film time discusses applications to other chemical problems such as the mechanism of photosynthesis and the use of special techniques such as isotope dilution analysis. Of considerable interest also is the description of carbon-14 dating. The lecturer closes with a strong statement regarding the need for scientists and the importance of good scientific training in schools. NUCLEAR REACTIONS (1963). 29 l / 2 minutes, black and white. Produced by the Educational Broadcasting Corporation, New York City, under the direction of the USAEC's Division of Nuclear Education and Training. For sale by Byron Motion Pictures, at $33.06 per print, including protective film treat- ment and shipping case, F.O.B. Washington, D. C. Available for loan (free) from USAEC headquarters and the nine field li- braries. Cleared for television. This segment of the series continues the discussion of the film "Under- standing the Atom: Alpha, Beta, and Gamma," and involves some of the basic concepts of nuclear reactions. Use is made of the nuclear well model as a useful teaching diagram. Neutron capture processes are described with the gamma emission and particle ejection reactions being studied. Nuclear fission is also discussed. As an example of the calculations involved in nuclear reactions, the film describes the activation of a gold sample in a nuclear reactor. Emphasis is placed on the minute quantities which can be detected with the subsequent applications to the technique of activation analysis. It is shown that hundredths of a part per billion of certain materials can be detected by nuclear techniques. PROPERTIES OF RADIATION (1962). 30 minutes, black and white. 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 $32.06 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 includes a discussion of general problems of radiation decay, such as the laws of radioactive decay, including the concept of half life. Statistical considerations are introduced, and the basic notion of the standard deviation in counts expected in various experiments is described. The energy spectrum from alpha and beta emitters is considered, and the use of absorption curves to study the energy distribution of beta radiation is introduced. The density thickness expressed in milligrams per square centimeter is introduced as a useful term. The film also considers problems of self-absorption, specific activity, and back-scattering of radiation.