Accession Number : AD0658658

Title :   AN EXPERIMENTAL EVALUATION OF VARIOUS GAMMA DOSIMETRY SYSTEMS,

Corporate Author : ARMY NUCLEAR DEFENSE LAB EDGEWOOD ARSENAL MD

Personal Author(s) : Gibson,Nancy N. ; Pelletier,Armand M. ; Hilton,Curtis G. ; Jacobson,John R. ; McNeilly,John H.

Report Date : AUG 1967

Pagination or Media Count : 46

Abstract : An evaluation of the gamma dosimetry systems presently in use at the US Army Nuclear Defense Laboratory (USANDL) was conducted at the KIWI-TNT reactor-safety experiment. This evaluation investigated the consistency of gamma exposure measurements obtained in all mixed radiation environments and determined possible sources of error in these measurements. Dosimetry systems evaluated were film, silver-activated metaphosphate glass rods and plates, cobalt-activated borosilicate glass plates, and manganese-activated calcium floride thermoluminescent dosimeters. The results of this experiment are in agreement with those obtained in other mixed radiation environments, as follows: The AgPO3 glass rods, the cobalt glass plates, the 1290 film, the AgPO3 glass plates (optical density technique), and the TLD exhibited approximately 10 percent reproducibility; optimum performance was obtained by exposing the dosimetry in energy discrimination shields and thermal neutron shields and applying numerical corrections for fast neutron effects; agreement between the different systems was approximately 20 percent to 40 percent when the dosimetry was utilized as described above; the accuracy of fast and thermal neutron sensitivities previously reported for these dosimetry systems was questionable. (Author)

Descriptors :   (*DOSIMETERS, ACCEPTABILITY), (*GAMMA COUNTERS, ACCEPTABILITY), RADIATION MEASURING INSTRUMENTS, ACCURACY, EXPOSURE(PHYSIOLOGY), NEUTRON REACTIONS, SHIELDING, SENSITIVITY

Subject Categories : Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE