Accession Number : AD0431548


Title :   REQUIREMENTS FOR MILITARY RADIACS. 2. EFFECT OF THE OPERATOR ON THE ENERGY-DIRECTIONAL RESPONSE OF PORTABLE RADIATION INSTRUMENTS,


Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF


Personal Author(s) : Wasson,H R ; Williams,D H


Report Date : 16 Dec 1963


Pagination or Media Count : 83


Abstract : This report presents the results of experiments designed to determine the response of selected military high-range radiacs to extended gamma radiation fields with and without a phantom (simulated operator). The IM-125/PDR-43, IM153/PD, IM-108A/PD, PDR-63 (USNRDL prototype), and DT-60(XN-2)/PD were tested with point sources of radiation with energies of 70, 120, 180 keV (eff), 667 keV, and 1170, 1330 keV at radiation intensities in the range 1 to 5 r/hr. Assuming that response of these radiacs to extended-field radiation sources can be inferred from their response to multilateral point sources at specific angles of elevation and over 360 deg of arc, it has been found that response to radiation backscattered from the operator compensates for decrease in response due to body (operator's) attenuation to an extent determined by type of radiac, carrying mode, and radiation energy. The presence of the operator has little effect on the response of the IM-125/PDR-43. Extended-field response of the IM-153/PD, IM-108A/PD, PDR-63, and DT-60(XN-2)/PD are all substantially decreased by the presence of the operator in varying degree, dependent on radiac type and radiation energy. Using present calibration methods, the net effect of the operator is to cause all of the radiacs tested, except the DT-60(XN-2)/PD, to indicate about 0.75 of the true free-field radiation dose rate or dose. (Author)


Descriptors :   *OPERATORS(PERSONNEL) , RADIATION MEASURING INSTRUMENTS , OPERATORS(PERSONNEL) , RELIABILITY(ELECTRONICS) , GAMMA RAYS , DOSIMETERS , RADIOACTIVE ISOTOPES , CALIBRATION , X RAYS , RADIATION MONITORS


Distribution Statement : APPROVED FOR PUBLIC RELEASE