INVESTIGATION OF CADMIUM SULFIDE AS A DETECTOR FOR MEASURING GAMMA BUILD UP IN AN INFINITE GEOMETRY (thesis)

Technical Report · Sat Mar 01 04:00:00 EST 1958

OSTI ID:4300204

Crane, G R

The small size and remote-reading capability of a photoconductive crystal, whose output current was proporional to the exposure dose rate, seemed to qualify it for further investigation as a build-up detector. Highlydoped cadmium-sulfide crystals were found to give linear conductivity response with dose rate from Co/sup 60/ gammas. Their gamma-sensitivity and rise by time characteristics were measured under variable temperatures, potentiai gradients, and dose rates. The optimum operational conditions were deftned for using the crystal as a build-up detector. Crystal output current was read by using a micro- ammeter in a simple d-c circuit. Build-up values were determined for lead, iron, and aluminum for several irradiation configurations in spherical geometry. These values compared favorably with computed theoretical values, thus attesting the value of the detector. Some ratios of B/sub infinite/ /B/sub finite/ were also reported. Further detector refinements are pointed out, in addition to suggestions for its use in studying build-up. (auth)

• Research Organization: Air Force Inst. of Tech., Wright-Patterson AFB, Ohio
• NSA Number: NSA-13-004783
• OSTI ID: 4300204
• Report Number(s): AD-157596
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM
CADMIUM SULFIDES
COBALT 60
CONFIGURATION
CRYSTALS
CURRENTS
ELECTRIC CONDUCTIVITY
GAMMA DETECTION
GAMMA RADIATION
GAMMA SOURCES
INSTRUMENTS
IRRADIATION
LEAD
MEASURED VALUES
NUMERICALS
PERFORMANCE
PHOTOELECTRIC EFFECT
PHYSICS AND MATHEMATICS
RADIATION DETECTORS
RADIATION DOSES
SENSITIVITY
TEMPERATURE
USES