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EDUCATION 13 which the staff can reevaluate and improve techniques, always with the purpose of keeping the exposure of each person below the established maximum permissible levels. RADIATION: SILENT SERVANT OF MANKIND (Magic of the Atom Series) See page 57 RADIOISOTOPE APPLICATIONS IN MEDICINE (Understanding the Atom Series) See page 61 RADIOISOTOPES IN BIOLOGY AND AGRICULTURE (Understanding the Atom Series) See page 62 TIME —THE SUREST POISON (Challenge Series) ... See page 52 TRACING AIRBORNE RADIOACTIVITY (Challenge Series) . . . . See page 52 TRACING LIVING CELLS (Challenge Series) ... See page 52 EDUCATION THE ALCHEMIST'S DREAM (Challenge Series). . . . See page 49 ATOMIC WEATHERMAN: STRONTIUM-90ISOTOPIC APPLICATIONS (1961). 18V 2 minutes, color. Produced by the Martin Company. For sale by Capital Film Laboratories, at $103.90 per print, including shipping case. This semitechnical film describes the world's first radioisotope- powered weather station, which is operating unattended at a remote site in the Canadian Arctic. The "atomic" weather station is powered by a thermoelectric unit in which the heat from the decay of Strontium- 90 ( 90 Sr) is directly converted into electricity. The film shows the major steps in the identification, testing, and preparation of the 90 Sr titanite compound; the loading of the radioisotope source in the weather- station generator; the principle of direct conversion of heat into elec- tricity; the operation of the generator; the weather-station equipment for sensing, data processing, and control and transmission; the final testing; the 4000-mile journey north into the remote Canadian Arctic aboard an icebreaker; the weather-station installation; and the success- ful transmission of weather data. The film explains the principal meth- ods of handling radioactive wastes from nuclear-reactor operations; the techniques for recovering valuable radioisotopes, such as 90 Sr; and the development of 90 Sr thermoelectric sources for unique small-scale power applications. Brief information is also given on other applica-