Accession Number : AD0460279

Title :   RADIOLOGICAL TECHNIQUES AND INSTRUMENTS USED FOR THE OCEANOGRAPHIC SURVEY ON OPERATION WIGWAM,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA

Personal Author(s) : Folsom, Theodore R.

Report Date : 30 JAN 1958

Pagination or Media Count : 36

Abstract : Instruments and techniques that were used for locating and mapping the radioactive water caused by the nuclear detonation of Operation Wigwam are described. Fission products in the water were detected by the gamma rays emitted. Halogen type Geiger-Mueller tubes were chosen as detectors because of their simplicity and reliability, and means were devised for permitting the combined use of several sizes of these tubes so that gamma-ray intensities could be measured over a long range. The pressure-resistant watertight shell necessary for work under water was designed for maximum ease of handling on deck and for simplicity, robustness, and low cost. Constructional features, including the scheme forinterchanging internal components to modify sensitivity of the instrument and to change its operational function, are summarized in schematic diagrams and assembly drawings. The operational procedures that were used on Operation Wigwam for probing water masses vertically and sweeping through them horizontally are briefly described and graphically illustrated. (Author)

Descriptors :   (*NUCLEAR EXPLOSIONS, UNDERWATER EXPLOSIONS), RADIOACTIVITY, INSTRUMENTATION, GEIGER COUNTERS, MEASUREMENT, MAPPING, GAMMA RAYS, SAMPLERS, TOWED BODIES.

Distribution Statement : APPROVED FOR PUBLIC RELEASE