NDA technology for uranium resource evaluation. Progress report, January 1--June 30, 1978 Page: 3 of 47
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NDA TECHNOLOGY FOR URANIUM RESOURCE EVALUATION
Compiled by
M. L. Evans
ABSTRACT
This progress report describes work per-
formed during the time period from January 1,
1978 to June 30, 1978, on the contract for NDA
Technology for Uranium Resource Evaluation in
Group Q-1. The work has focused on gamma-ray
calculations and computer code modifications in
support of borehole logging measurements ano
surface gamma-ray surveys. Experimental effort
has concentrated on improvements in uranium
fission.neutron detection efficiency.
The Phase II calculations deal with aamma-
ray surface and airborne surveys. The initial
calculations are to determine the KUT spectra as
a function of position and angle above and below
a plane interface. Diagnostic calculations have
been performed to independently verify the appro-
priateness of the model used by ONETRAN in cal-
culating the angular fluxes of Phase II and to
determine the optimum values for the model p.:ram-
eters. However, all attempts to eliminate un-
physical oscillations in the high-energy angular
fluxes by judiciously choosing the model param-
eters have not been successful. Alternat:.vely,
a criterion based on single Compton scat-.ering
has been devised by which angular flux values
calculated by ONETRAN are accepted if they are
physically reasonable but rejected if they are
unphysical. The Monte Carlo code MCNG has been
used to calculate angle-integrated currents for
comparison with those obtained from ONETRAN.
The ONETRAN direct currents agree very well with
those of MCNG for both high (for example, 2.655-
MeV) and low (for example, 0.46- MeV) photon
energies. The sky-shine currents of ONETRAN1
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Evans, M.L. (comp.). NDA technology for uranium resource evaluation. Progress report, January 1--June 30, 1978, report, January 1, 1979; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1209517/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.