LUMP CORRECTION AND IDENTIFICATION IN THE COMBINED THERMAL/EPITHERMAL NEUTRON (CTEN) METHOD

Year
1998
Author(s)
K.L. Coop - Los Alamos National Laboratory
Charles L. Hollas - Los Alamos National Laboratory
Robert J. Estep - Los Alamos National Laboratory
Sheila Melton - Los Alamos National Laboratory
David K. Miko - Los Alamos National Laboratory
Abstract
We present a model for self shielding in lumps of fissile material in active-neutron assays. The model combines the formula for self-attenuation of gamma-ray in lumpy sources with the multi-group analysis techniques used in neutron transport calculations. Models for thin foils and for spheres are examined in terms of error multiplication in determining lump corrections and the basic accuracy of the model.