1 The July 1945 Szilard Petition on the Atomic Bomb Memoir by a signer in Oak Ridge Howard Gest Distinguished Professor Emeritus of Microbiology, Departments of Biology, and History & Philosophy of Science, Indiana University, Bloomington, IN 47405 2 Well before the first test of a nuclear explosive device at Alamogordo (New Mexico) on July 16, 1945, many scientists of the Manhattan (Atomic Bomb) Project were very concerned about how nuclear bombs might be used in World War II. Meetings were held at the University of Chicago site and at Oak Ridge (Tennessee) to discuss the future of atomic energy and its political implications. As a result, a petition originated by Leo Szilard and addressed to President Truman in July 1945 discussed the moral responsibilities involved in using nuclear weapons. It recommended that such bombs not be used against Japan “unless the terms which will be imposed upon Japan have been made public in detail and Japan knowing these terms has refused to surrender.” The Szilard petition was displayed during 1989/1990 in a special exhibition at the National Archives in Washington, D.C. This article explains how I happened to be in Oak Ridge, where I signed the petition, and examines its background and complex, unfortunate history. From bacteriology to nuclear chemistry After graduating from the University of California at Los Angeles (UCLA) in 1942, with a major in bacteriology, I began graduate work with Max Delbrück at Vanderbilt University in Nashville, Tennessee (Delbrück was awarded a Nobel Prize in 1969 for his research on bacterial viruses). Because of the increasing intensity of World War II in 1942, however, research in universities was grinding to a halt. One evening I received a telephone call from Dr. Charles D. Coryell, one of my chemistry instructors at UCLA, who invited me to join his research group in a secret project at the University of Chicago, and I decided to accept. Coryell's group was an important unit of the Manhattan Project, and in the late summer of 1943 our group was transferred to the newly constructed Clinton Laboratories, part of the “Clinton Engineer Works,” at Oak Ridge, Tennessee. At the time, the Oak Ridge townsite resembled a movie set of a frontier Western town--dirt streets and sidewalks made of wooden slats--but there were no saloons, which delighted the bootleggers who operated illegal stills outside of the barbed wire. 3 Oak Ridge, 1943-1945 Under tight military security, Clinton Laboratories was one of the major scientific installations within a large army reservation. It was the site of the uranium chain reaction “pile” used for early physics and chemistry research on atomic bombs. Associated with the pile, there was a pilot plant for the production of plutonium. Our responsibilities in the Chemistry Division, under Coryell’s leadership, focused primarily on characterization of more than 250 radioactive isotopes that are created by the fission of uranium and the development of a process for chemical isolation of plutonium. We also investigated chemical processes associated with the spontaneous disintegration of radioactive atoms. After declassification of some of our secret research, I became the co-author of eleven papers on the properties of radioactive isotopes [in the National Nuclear Energy Series, McGraw-Hill, 1951]. One of these papers, of which I was the senior author, dealt with the element Barium. As a special assignment, our group prepared gigantic quantities of a radioactive isotope of Barium produced in uranium fission, that was needed by Los Alamos physicists for testing atomic bomb detonation characteristics. Preparation of the radioactive Barium (mass 140) required chemical processing by remote control, at a time when there was almost no equipment available for such work. Nevertheless, we managed somehow. Late on the night of September 18, 1944, from a considerable distance away, our group witnessed a dramatic transfer, by crane, of 280 curies of the isotope --a huge, glowing radioactive source--from a thick-walled preparation laboratory to a large lead vault in an unmarked army truck. This truck was part of a convoy that left immediately for Los Alamos. Subsequently, we made shipments of as much as 1000 curies! About ten days after our first shipment, the Germans began destructive attacks on southern England with more than 1500 V-2 rockets. Many memories of my years in Oak Ridge were evoked in 1989, when I learned that the "classified" Szilard petition, strongly supported by the members of our chemistry research division, was to be displayed at the National Archives in Washington, D.C. 4 Leo Szilard's petition to the President of the United States Leo Szilard (1898-1964) once drafted an outline for an autobiography, but it was never written. Fortunately, there are tape-recorded interviews in which he reminisced about his remarkable life [1]. He was born in Hungary, the oldest of three children of a successful Jewish architect-engineer. An early interest in electrical engineering led to graduate study in physics at the University of Berlin, where he received a doctoral degree in 1922. Szilard continued research activities in Berlin, and eventually was a Privatdozent (a lecturer without stipend) at the university. Hitler came into power in January 1933, and Szilard immediately recognized the portent of this development. A few days after the Reichstag fire (February 27, 1933) Szilard made his way to England and in September 1933 he “read in the newspapers a speech by Lord Rutherford, who was quoted as saying that he who talks about the liberation of atomic energy on an industrial scale is talking moonshine. This set me pondering as I was walking the streets of London, and I remember that I stopped for a red light at the intersection of Southampton Row. As the light changed to green and I crossed the street, it suddenly occurred to me that if we could find an element that is split by neutrons and which would emit two neutrons when it absorbed one neutron, such an element, if assembled in sufficiently large mass, could sustain a nuclear chain reaction”[1]. Some years later, uranium was discovered to be the kind of element that Szilard had in mind. The basic patent for the nuclear fission reactor was awarded jointly to Szilard and Enrico Fermi in 1945, but Szilard never benefitted from it financially. Incidentally, while still in Germany, he and Albert Einstein patented an electromagnetic pump for liquid refrigerants which later proved to be useful in the operation of nuclear reactors. Szilard was primarily responsible for initiating the Manhattan Atomic Bomb Project in that he persuaded Einstein to write President Roosevelt in 1939 about the urgency of developing atomic power for domestic and military purposes. This influential letter was in fact drafted by Szilard. In 1944 or early 1945, scientists at the Clinton Laboratories formed an organization called “The Association of Oak Ridge Scientists at Clinton 5 Laboratories” for discussion of issues relating to atomic bombs and peaceful uses of atomic energy. When telephone calls from the Chicago site and Oak Ridge to Los Alamos were suddenly prohibited, Szilard realized that the bomb would soon be tested: “I knew by this time that it would not be possible to dissuade the government from using the bomb against the cities of Japan...I thought the time had come for the scientists to go on record against the use of the bomb against the cities of Japan on moral grounds. Therefore I drafted a petition which was circulated in the project” [1]. During the early days of July 1945, Szilard’s petition was discussed, and various criticisms led to revised versions. The final text (see end of this article), dated July 17, 1945, stated in part: “The development of atomic power will provide the nations with new means of destruction. The atomic bombs at our disposal represent only the first step in this direction, and there is almost no limit to the destructive power which will become available in the course of their future development. Thus a nation which sets the precedent of using these newly liberated forces of nature for purposes of destruction may have to bear the responsibility of opening the door to an era of devastation on an unimaginable scale.... “In view of the foregoing, we, the undersigned, respectfully petition: first, that you exercise your power as Commander-in-Chief, to rule that the United States shall not resort to the use of atomic bombs in this war unless the terms which will be imposed upon Japan have been made public in detail and Japan knowing these terms has refused to surrender; second, that in such an event the question whether or not to use atomic bombs be decided by you in the light of the considerations presented in this petition as well as all the other moral responsibilities which are involved.” August 1945 Use of the atomic bombs that destroyed Hiroshima and Nagasaki during the first two weeks of August 1945 was soon followed by the surrender of Japan, and the Atomic Age had begun. Immediately after the bombs were dropped, Szilard felt it was important to “tell people what this was about and what we were facing in this century.” The petition had been declared to be a “classified” document, but Szilard notified the responsible officer of the 6 Manhattan Project that he (Szilard) intended to declassify the petition on his own accord and make the contents public. His attempt did not succeed: “Shortly thereafter I received a call from the Manhattan District, saying that General [Leslie] Groves wanted the petition to be reclassified 'Secret.' I said that I would not do this on the basis of a telephone conversation, but I would want to have a letter explaining for what reason the petition, which contained nothing secret, should be reclassified.