Accession Number : AD0420801

Title :   ACCURACY OF MILITARY RADIACS.

Descriptive Note : Rept. to the test director,

Corporate Author : NAVAL ORDNANCE TEST STATION CHINA LAKE CA

Personal Author(s) : Work, George A.

Report Date : 15 NOV 1957

Pagination or Media Count : 56

Abstract : The accuracy of several types of radiac equipment used in residual radiation fluxes from nuclear devices was measured. The five types of ratemeters chosen for project work (AN/PDR-18, 18A, 18B. T1-B, and CDV-710) represent the entire complement of high-range radiac instruments currently available to military and civiliandefense forces. Instrument response, relative to a gamma-ray standard and an initial Co calibration, was determined in several different radiological situations and as a function of timeafter-fission. All instrument types were found to read low, relative to the standards, owing to deficiencies in the present calibration procedures. Changes in calibration methods for each equipment type are recommended, and suggestions are made for general specification provisions for this kind of equipment. The directional properties of the residual radiation fluxes were investigated, and a number of different source configurations were determined. Wide variations were found in the indications of instruments of the same type in identical field situations. The project data indicate that errors as high as 50 percent may occur with carefully handled and calibrated instruments. On the basis of this work, it is concluded that radiac instruments should not be used to make close estimates of percentage radiation casualties. (Author)

Descriptors :   (*RADIATION MEASURING INSTRUMENTS, INSTRUMENTATION), GAMMA COUNTERS, SCINTILLATION COUNTERS, CALIBRATION, SPECIFICATIONS, ERRORS, DETECTORS, DOSE RATE, GAMMA RAYS, NUCLEAR EXPLOSIONS, DIRECTION FINDING.

Distribution Statement : APPROVED FOR PUBLIC RELEASE