208 OTHER MAJOR ACTIVITIES based on the idea that the tremendous and relatively inexpensive energy and phenomenareleased in a nuclear explosion can be used for constructive purposes. The program encompasses: laboratory research and analyses of data; design, development, and testing of nuclear explosive devices for peaceful purposes; and field experiments. Primary research and development efforts are carried out at the Lawrence Radiation Laboratory, Livermore, Calif. Other research and development is underway at the Oak Ridge National Laboratory, Oak Ridge, Tenn.; the Sandia Laboratory Corp., Albuquerque, N. Mex.; and the Savannah River Laboratory, Aiken, S8.C.; and in the laboratories of other Government agencies such as the U.S. Bureau of Mines, the U.S. Geological Survey, the U.S. Public Health Service, the U.S. Weather Bureau, and the U.S. Army Corps of Engineers, and in the Laboratories of several contractors and sub-contractors. Field tests involving nuclear explosives are carried out by the Nevada Operations Office at the Nevada Test Site and at other locations. The San Francisco Operations Office has certain responsibilities for program and policy development, especially concerning the use of nuclear explosives in cooperative projects with industry. ' APPLICATIONS UNDER STUDY Nuclear explosions can be designed so that the explosion is controlled and the energy madeavailable for a specific purpose. Nuclear explosions can be divided into two broad categories—contained explosions and cratering explosions. Contained nuclear explosions shatter rock underground which could have value in mining and oil and gas production. It also appears that certain valuable radioisotopes can be produced in and recovered from contained nuclear detonations. Most plans for using nuclear explosions for scientific research involve contained detonations. Industrial uses for cratering explosions depend primarily upon using the energy from nuclear explosives to move earth. In this way it appears possible to simplify construction of harbors, transportation and water conveyance canals, and storage reservoirs. Status and Plans Primary effort in 1963 was devoted to the development of nuclear explosives for both scientific and industrial use, to research and analysis of data from past field experiments, and to design of future field experiments needed to acquire additional data. No nuclear field experiments were conducted by the Plowshare Program in 1963, except developmental tests of nuclear explosives. Thestate of devel-

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