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40 RADIOISOTOPES-PRODUCTION AND HANDLING five objectives: (1) To determine characteristics and physical effects of underground detonations in a salt medium; (2) to explore feasibility of converting energy produced into electricity; (3) to make neutron cross-measurements which would contribute to scientific knowledge; (4) to provide information on design of nuclear explosives for peaceful purposes; and, (5) to investigate the practicability of recovering useful radioisotopes. Topics covered: geological and safety considerations ex- plored in selection of the Gnome site; drilling and construction of the shaft, underground access tunnel and shot chamber; the surface in- stallations; special monitoring and other programs conducted to afford safety to the public; the seismic and radiological monitoring programs; principal equipment and instrumentation installation in support of the complex scientific experiments; the pre-shot news media tour; the surface movement above ground zero at the moment of detonation; the escape of vapor from the shaft; recovery of scientific data and equip- ment; and entry into the underground cavity in May 1962. Dr. Edward Teller, University of California nuclear physicist, discusses the ob- jectives of the Plowshare Program and the preliminary results of Project Gnome in the opening and closing scenes. PROJECT SEDAN (1962). 8 minutes, color. Produced for the USAEC's Lawrence Radiation Laboratory at the University of California. For sale by W. A. Palmer Films, at $39.10 per print, including shipping case. This semitechnical motion picture reports on the July 6, 1962, nuclear crate ring detonation at the Nevada Test Site. This was the first of a series of experiments under the U. S. Atomic Energy Commission's Plowshare Program to determine the feasibility of nuclear excavatipns. The specific objective was to determine the cratering of radioactivity entrapment effects of detonating a 100-kiloton nuclear device buried 635 feet in desert alluvium. The film discusses the relationships be- tween depth of explosion and crater size, and depth of explosion and containment of radioactivity. It shows the location, slow-motion shots of the detonation, the area covered by the base surge, the crater (1200 feet in diameter, 320 feet in depth), the fallout pattern, and relates the experiment to possible large-scale excavation projects such as har- bors and canals. RADIOISOTOPES-PRODUCTION AND HANDLING THE ART OF SEPARATION (Challenge Series) .... See page 49 THE ATOMIC PHARMACY (Magic of the Atom Series) . . See page 56