Project 10073 Record Card and Related Correspondence regarding Mt. Palomar and Los Alamos Sightings

This document collection details an investigation into reports of unidentified aerial phenomena and associated radiation detection at the Mt. Palomar Observatory in 1949 and subsequent inquiries at the Los Alamos Scientific Laboratory in 1952. The initial incident at Mt. Palomar involved scientists observing a V-formation of shiny objects while a recording Geiger counter simultaneously went off-scale. The Office of Naval Research (ONR) in Pasadena investigated these reports, concluding that the objects were likely conventional aircraft and that the Geiger counter readings were caused by equipment malfunction, specifically a faulty fuse clip that produced a spurious signal when jarred. Despite these findings, interest persisted, leading to further investigations by the Air Technical Intelligence Center (ATIC) and Captain E. J. Ruppelt. In 1952, ATIC personnel, including Captain Ruppelt and Colonel D. L. Bower, visited Los Alamos to brief scientists and discuss potential correlations between radiation detection and UFO sightings. The Los Alamos group had also observed radiation spikes that they could not explain, though they were unable to establish a definitive link to aerial objects. The documents include correspondence between ATIC, the Atomic Energy Commission, and the Los Alamos Scientific Laboratory regarding the coordination of these briefings and the desire of the laboratory staff to discuss the scientific aspects of the 'flying saucer' phenomenon. The records emphasize that the scientists involved were highly qualified and had checked all known sources of radiation, yet remained puzzled by the readings. The investigation ultimately remained inconclusive, with ATIC noting that the accounts were too vague to draw definite conclusions, though they recommended further study of radiation monitoring stations across the United States. The documents also highlight the sensitivity of the observatory staff regarding publicity, as they feared adverse effects on their institution. The collection includes various internal memos, message forms, and reports detailing the administrative efforts to coordinate these investigations and the technical challenges in correlating radiation data with visual sightings.