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UNDERSTANDING THE ATOM SERIES 63 ing projects are shown. In the animal sciences, important information on the study of aging has come out of the use of radiation as a stress. Various theories of aging have been tested, and it appears that aging is primarily associated with the damage to chromosomes. If the DNA is damaged, animals grow older because of basic instability of DNA. Other examples of the importance of radiation to molecular biology are shown. RADIOLOGICAL SAFETY (1963). 30 minutes. Produced by the Educational Broadcasting Corporation, New York City, under the direction of USAEC's Division of Nuclear Education and Training. For sale by Byron Motion Pictures, at $33.06 per print, including shipping case. This film examines the field of radiological safety or health physics, and tries to give a basis for a perspective on potential biological ra- diation damage. It first considers background radiation and the nature of the difference in this radiation. Larger doses of radiation can be a potential cause of both somatic (direct bodily) damage and genetic (hereditary) damage, and consideration is given to the maximum per- missible limits or radiation guide levels which have been established by various radiological protection committees and the Federal Radia- tion Council. Various units are described, with these including the roentgen, the rad, and the rem. The latter unit is a measure of the biological dose equivalent and considers the relative biological effec- tiveness (RBE) of the radiation. Consideration is also given to the max- imum permissible concentration of radioisotopes in water or air, and the problems involved in the localization of radioactive materials in the body. Various factors that must be controlled in reducing the radiation hazard include the quantity of radioactive material, the distance, the time of exposure, and shielding. Internal exposure must be minimized by the use of special laboratory facilities and techniques which are re- quired to minimize the admission of radioactive isotopes into the body. The importance of having calibrated instruments available is stressed in any program involving the use of radiation sources.