


The primary study of the Marshallese was terminated around 75 days after the time of exposure. Navy ships were used in the project: USS Nicholas, USS Renshaw, and USS Philip. Organizations involved in the project included the Naval Medical Research Institute, the Naval Radiological Defense Laboratory, Patrol Squadron 29, the Naval Air Station, Kwajalein, Los Alamos National Laboratory, the Applied Fisheries Laboratory at the University of Washington, and Hanford Atomic Power Operations. The Castle Bravo fallout plume spread dangerous levels of radiation over an area over 100 miles long, including inhabited islands.
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Preparation Īs a Department of Energy Committee writing on the human radiation experiments wrote, "It appears to have been almost immediately apparent to the AEC and the Joint Task Force running the Castle series that research on radiation effects could be done in conjunction with the medical treatment of the exposed populations." The DOE report also concluded that "The dual purpose of what is now a DOE medical program has led to a view by the Marshallese that they were being used as 'guinea pigs' in a 'radiation experiment.'" The purposes of were to (1) evaluate the severity of radiation injury to the human beings exposed, (2) provide for all necessary medical care, and (3) conduct a scientific study of radiation injuries to human beings. The purpose of the project, as a 1982 Defense Nuclear Agency report explained, was both medical as well as for research purposes: Due to possible adverse public reaction, you will specifically instruct all personnel in this project to be particularly careful not to discuss the purpose of this project and its background or findings with any except those who have specific " need to know." the project is classified SECRET RESTRICTED DATA. Cronkite's instructions stressed the importance of secrecy surrounding the project:

Cronkite of the National Naval Medical Center was designated as Project Officer. Program 4, "Biomedical effects," was to include one project, Project 4.1, titled "Study of Response of Human Beings exposed to Significant Beta and Gamma Radiation due to Fall-out from High-Yield Weapons." Eugene P. In the wake of the Castle Bravo detonation, a new research section was added to the Castle Bravo Weapons Effects research section. Government and mainstream historical sources point to the study being organized on March 6 or March 7, 1954, six days after the Bravo shot. Project 4.1 was the designation for a medical study and experimentation conducted by the United States of those residents of the Marshall Islands exposed to radioactive fallout from the MaCastle Bravo nuclear test at Bikini Atoll, which had an unexpectedly large yield. The cover to the Project 4.1 Final Report, "Study of Response of Human Beings Accidentally Exposed to Significant Fallout Radiation."
