Atomic Energy Commission Injected Humans With Plutonium in Secret

By Roy Castellano · August 10, 2026

Dead infants were used to measure strontium-90 while humans were injected with plutonium, secrets that stayed hidden until a 1974 investigation into the state's nuclear experiments.

The catalogue entry for the Atomic Energy Commission's "Classified General Correspondence" reads as a ledger of necessary risks. It describes a series of files managing the friction between the high-stakes requirements of a nuclear state and the biological realities of the people inhabiting it. These records do not contain the correspondence itself, but the scope-and-content description provides a map of where the Commission's priorities lay: biomedical research, university funding, and the managing of "controversies concerning nuclear fallout and thermal pollution."

For anyone who spent time in the war-plans rooms, the mention of "controversies" in a government catalogue is usually shorthand for a collision between operational necessity and public perception. The Atomic Energy Commission, established in 1946, was tasked with the impossible: mastering a force that could end civilization while convincing the public that the process was under control. The files described here track that tension, moving from the raw urgency of the early Cold War to the later, more litigious era of the National Environmental Policy Act.

Project Sunshine

Among the related series listed in the National Archives search are the "Central Subject Files." These records include documentation on a specific, haunting effort known as Project Sunshine. The catalogue identifies this project alongside "biomedical activities at nuclear weapons tests" and the "1950 fallout controversy."

Project Sunshine was the effort to collect biological samples—often from deceased infants—to measure the global spread of strontium-90, a byproduct of atmospheric nuclear testing. To the analyst, this was not a matter of curiosity but of intelligence. If you are calculating the effects of a first strike or the feasibility of a prolonged exchange, you need to know exactly how the atmosphere distributes radioactive isotopes. You need a baseline of contamination. The "biomedical research programs at Commission laboratories" mentioned in the general correspondence were the mechanisms for turning this biological data into strategic intelligence.

Plutonium Injections

The records do not stop at atmospheric fallout. The "Central Subject Files" specifically note a "1974 investigation of plutonium injection experiments." This is echoed by another series, the "Records Related to Research Materials," which contains materials compiled by the Advisory Committee on Human Radiation Experiments.

These entries point to a dark corner of the AEC's legacy: the deliberate injection of plutonium into human subjects to determine how the body processes the element. In the context of the 1940s and 50s, the logic was cold but consistent. With the Soviets racing to match the American arsenal, the cost of ignorance was higher than the cost of a few ethically compromised experiments. The 1974 investigation, as noted in the catalogue, was the delayed accounting for those decisions. It represents the moment the state's need for secret knowledge finally collided with the legal frameworks of the modern era.

Civil Defense and SAC

Perhaps most telling for those of us who wore the uniform are the "Records Relating to Civil Defense." The archive describes these files as containing information on the "structure, functions, missions, controversies, and activities of the agency." Crucially, the catalogue notes that these records address "the strategic air command," as well as disarmament, defense mobilization, and emergency relocation.

There is a brief, truncated mention of "military cap" at the end of the description—a gap in the OCR or a redaction in the summary—but the link to SAC is explicit. The Atomic Energy Commission was not an ivory tower of physicists; it was a partner in the deterrence machine. The correspondence regarding "civil aviation" and "emergency relocation" was the logistics of survival. If SAC was the sword, the AEC's civil defense planning was the shield, however porous that shield may have been.

As the years progressed, the nature of the correspondence shifted. The catalogue entry notes that the later files deal with the "implementation of the National Environmental Policy Act." This marks the transition from the era of the Great Project—where the mission of national survival superseded almost every other concern—to the era of the regulatory state. The files move from calculating the fallout of a megaton blast to calculating the "thermal pollution" of a power plant.

We are left with a series of descriptions that outline a long retreat from the frontier. The Commission began by managing the apocalypse and ended by managing paperwork. The archives hold the evidence of a time when the government believed that the only way to survive a nuclear world was to experiment on it, and on us, in secret. The question remains as to how many of the "biomedical research programs" described in these catalogue entries were driven by science, and how many were driven by the fear of what the Soviets already knew.