delegation to the first |AEA delivered the President's mes “-rence, Lewis Strauss f hope that the fis- sioned atom would now.betra ned from a symbol of fear to one of hope. The new spirit of international cooperation had been in evidence even earlier when more than 1400 scientists from 73 nations attended the first United Nations sponsored International Conference on the Peaceful Uses of Atomic Energy, held in Geneva, Switzerland in August 1965. Similar conferences were held in 1968, 1964 and 1971. In addition to sponsoring the International Atomic Energy Agency, the United States gave strong support to Euratom, the European atomic snergy community consisting of West Germany, France, Italy, Belgium, the Netherlands and Luxembourg. Formally inaugurated in January 1958, Euratom undertook to establish an integrated program for developing an atomic energy industry in Europe similar to the European Coai and Steel Community. Prior to the establishment of either the International Atomic Energy Agency or Euratom, the Atomic Energy Commission had negotiated a series of bilateral agreements to provide research reactors, power reactor fuel and technical information to friendly nations, as well as training programs for nuclear scientists and technicians. Although no bilateral agreements were made with the Soviet Union, Commission Chairman John A. McCone and his Soviet counterpart, Professor Vasily S. Emelyanov, signed a Memorandum on Cooperation on November 24, 1989, covering exchanges of visits and information on several unclassified areas of peaceful nuclear application. Similar memorandain the 1960's and early 1970’s covered joint experimentsin the fields of high energy physics, controlled thermonuclear research and fast breeder reactors.(18) Weapon Testing and Fallout The detonation of the first shot in the Castle weapon test series in the spring of 1954, however, had threatened to cast a shadow over the glowing prospects for the peaceful atom, so recently kindled by Eisenhower’s atomsfor-peace proposal. At the time of the Bravo shot on March 1, a Japanese fishing vessel had been within 82 nautical miles of the test area, close enough to receive a heavy dusting of radioactive fallout. By the time the ship, the Fukuryu Maru (or Lucky Dragon) returned to Japan the effects of the radiation exposure had becomeevident, and several members of the crew required hospitalization. The American and Japanese press accounts of the: incident had made the public aware, probably for the first time, of the worldwide dangersof radiation from fallout.(19) On February 15, 1955, with the approval of the President, Strauss released a major report on the “Effects of High-Yield Nuclear Explosions.” The report did little to calm public apprehension, and mounting concerns found expression in numerous articles on radiation and fallout in scientific journals and other public media. Both the Committee on Armed Services and the Joint Committee on Atomic Energy held hearings in the spring of 1955 on problems associated with radioactive fallout. The following December the United Nations established a Scientific Committee on Radiation with the former director of the Commission’s Division of Biology and Medicine, Shields Warren, as United States’ representative.(20} in January 1956 Commissioner Willard F. Libby revealed the existence of Project Sunshine, a study of globalfallout from weapontesting which Libby had initiated in thefall of 1963 while serving on the General Advisory Committee. Commission laboratories and contractors had been analyz- ing data collected through a worldwide network monitor- ing the presence of strontium 90 in humans, foods and soils. Prior to 1953 public concern with radiation had focused primarily on workers in atomic energy projects. In 1957 the Joint Committee’s hearings on the nature of radioactive fallout revealed for the first time the extent of the Commission's radiation research program. Millions of dollars were involved in more than 300 Commissionsponsored projects on various aspects of radiation and fallout.(21) Testing of nuclear devices by the United States continued throughout the 1950's, although the Eisenhower Administration repeatedly expressed its willingness to suspend nuclear tests as part of a disarmament agreement. When the Conference of Experts convened in Geneva in the summer of 1958, the President announced that the United States was prepared to negotiate a test ban agreement and would voluntarily suspend all weapon testing after the completion of the Hardtack series in the fall. As a result an unpoliced moratorium period began on October 31, 1958, during which both the United States and the Soviet Union periments.{22) refrained from nuclear weapon ex- Limited Test Ban Treaty Three years later the Soviet Union abruptly ended the moratorium by announcing, on August 31, 1961, that they intended to resumetesting. By now John F. Kennedy was in the White House, and Glenn Seaborg had succeeded John McCone as chairman. One of the original members of the General Advisory Committee and thefirst scientist appointed as chairman of the Commission, Seaborg served during the entire decade of the 1960's. Although the Soviet Union tested a large number of high-yield weapons in the atmosphere during the autumn of 1961, President Kennedy limited the Commission’s weapon /aboratories to underground tests until April 25, 1962, when thefirst shot in the Dominic series was conducted at Christmas tsland in the Pacific. With technical support from Seaborg and the Commission, the President at the same time had been earnestly pursuing a test ban agreement with the Soviet Union. It had been a long and arduous task bearinglittle fruit. In an address to the Nation on March2, 1962, Kennedy had explained that he deplored the necessity of beginning atmospheric testing again, but ‘fa nation which is refraining from tests obviously cannot match the gains of a nation conducting tests."(23) Finally, after months of negotiations, a limited test ban treaty was signed in Moscow on August 5, 1963, prohibiting nuclear explosion tests in the atmosphere, outer space, or under water, but permitting underground detonations provided no radioactive debris crossed the borders of the country in which the test was being conducted. in the absenceof further success in negotiating a comprehensive test ban treaty, President Kennedy, and iater Presidents Johnson and Nixon, continued to authorize