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AERO-SPACE PROGRAMS assembly into a compact operating system capable of converting heat energy into electrical current without the need for moving parts. Compacting of strontium-90 raw material into ceramic titanate pellets and encapsulation of the fuel pellets into high strength metal containers is illustrated. Installation of the SNAP-7 generator family—to power unattended weather stations in Antarctica and the Gulf of Mexico, navigational aids to shipping in Chesapeake Bay and the Gulf of Mexico, deep sea acoustic research in the Atlantic Ocean—is depicted by means of film footage obtained during actual installation and implantment at the operating sites. Fully shielded strontium-90 fueled, thermoelectric generators have been placed into operational service at remote out- posts from north of the Arctic Circle to the South Pole. Developed by the U. S. Atomic Energy Commission under the SNAP (Systems for Nuclear Auxiliary Power) program, they are now proving the feasibility of reliable, unattended electrical power production from heat generated by decay of radioisotopes. The film concludes with a description of current development work and predictions relating to the next generation of strontium-90 thermo- electric power supplies for terrestrial uses. RFD-2 (1965). 14 minutes, color. Produced for the USAEC by the Sandia Corporation. For sale by Calvin Productions, Inc., at $40.53 per print, including shipping case, F.O.B. Kansas City, Missouri. Available for loan (free) from USAEC headquarters and field libraries. NOT cleared for television. This film outlines the design and test work performed by Sandia Corporation in assessing the nuclear safety aspects of a SNAP-19 type isotopic generator designed to supply electrical power in certain communications satellites. The film describes the flight of an inert reactor aboard a Scout rocket to investigate the burnup and dis- assembly of the dummy reactor upon re-entry. Shown are the instru- mentation systems developed by Sandia to transmit to ground-based receiving stations information on the burnup of the reactor and its fuel rods. The pre-flight test program conducted at Sandia, and shown in the film, included ejection tests of fuel rod experiments, tests on the flotation system designed to recover the test vehicle from the ocean, radiant heat testing of the protective shell of the vehicle, and acoustic noise tests to simulate rocket motor noise and vibration. Some scenes at the tracking and data-re cor ding station on Bermuda precede the film report of the launch and re-entry of the dummy reactor. A brief analysis is made of data gained from the test program to summarize the efforts being made to minimize the hazard of using reactors and isotopic generators in space applications.