Abstract
Neutron fluence-to-dose equivalent conversion factors are calculated for three types of finger and wrist extremity phantoms: (1) the polymethyl methacrylate models specified by the U.S. Department of Energy Laboratory Accreditation Program for Personnel Dosimetry Systems (DOELAP); (2) the tissue-and-bone phantoms suggested by Pacific Northwest National Laboratory; and (3) the Radiology Support Devices (RSD) Inc. RS-122T an-n/shoulder phantom. Extremity factors are determined at shallow surface and bone levels for bare, D20moderated and polyethylene moderated 112Cf. The DOELAP free-field calibration geometry and a realistic glovebox scenario are simulated using a Monte Carlo neutron and photon transport code. Calculated DOELAP and RSD extremity fluence-to-dose equivalent conversion factors for the free-field calibration geometry are 1 to 9 percent lower than the calculated whole-body conversion factor. The tissue-and-bone phantoms exhibit conversion factors 1 to 10 percent greater than the whole-body factor. Glovebox fluence-to-dose equivalent conversion factors range from 12 percent less than to 128 percent greater than calculated free-field whole-body conversion factors. A preliminary evaluation of the application of the calculated fluence-to-dose equivalent conversion factors to Los Alamos National Laboratory extremity dosimeter correction factors is performed.
Wood-Zika, Annmarie Ruth (1997). Calculation of extremity neutron fluence-to-dose equivalent conversion factors. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1997 -THESIS -W555.