Form: 97 BB Docs
Date: Fri, 14 Apr 2006 12:27:35 -0600
From: Francis Ridge,
Subject: SECRET Document Mentions Correlation Between Sightings and Rise in Radiation, dated 27 Feb 1953

Cat: 10
Distribution: CE, SHG, NCP

In the summer of 1952 it was reported to Project Blue Book that in the past several years there have been some instances where there existed a supposed correlation between the visual sighting of unidentified object and a rapid rise in radiation count on radiation detecting devices in areas close to the Mt, Palomar Observatory, California, and later at Los Alamos, New Mexico. In early fall of 1952 Project Blue Book began to make inquiries about these occurrences. It was found that in October 1949 such an incident had occurred at the Mt. Palomar Observatory and that the Navy had investigated. It was also learned that several times during 1950, 1951, and 195? that same occurrence had taken place at the Los Alamos Scientific Laboratory in Los Alamos, New Mexico.

In regard to the Palomar incidents, the Navy flew several aircraft over the area on Oct. 21 and Nov. 2, 1949, with different types of radio, radio altimeter and radar equipment to see if anything could trigger the geiger counters, but failed. There were 21 episodes of the cosmic ray geiger counters going off-scale over the next 10 days and then suddenly stopping, without explanation. 

 Page ID (PID)  NARA-PBB85-766
Collection  National Archives (NARA)
Roll Description  NARA Blue Book Roll 85
Document Code  T1206-85

From PBB Status Report No. 10, beginning at