TABLE NO. 3 UNITED STATES, UNITED KINGDOM, AND SOVIET NUCLEAR EVENTS (Yield in Kilotons) inclusive Years FISSION YIELD * Ground Water Air Surface Surface Burst Burst Bur st TOTAL YIELD Air Burst Surface Bur st 1945-1951 190 550 20 190 570 1952-21954 1,000 15,900 22,000 1,000 59,000 1955-1956 5,600 1,500 6,000 11,000 17,000 1957-1958 31,000 4,400 4, 600 57,000 28,000 * A value of 50% has been arbitrarily selected for the fission to total yield ratio for all Soviet thermonuclear tests. As indi-— cated in the tables, 30% is about the average fission to total yield ratio for all US/UK thermonuclear tests. TABLE NO. 3 9002310

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