NON-DESTRUCTIVE ANALYSIS OF URANIUM IN GRAPHITE FUEL ELEMENTS BY NEUTRON ACTIVATION Page: 4 of 8
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-3-
(e) The calculations for determining the U238 content of the test
samples are very simple. Since all of the terms in the activation analysis
equation.
AM
(6.02 x 10 )(f)(ac)(9)(-et)(e) (1)
A = Radioactivity, dps
M = atomic weight of the target element
6.02 x 1023 = Avogadro's number
2
f = neutron flux, n/cm /sec
-2h 2
(~ac = activation cross-section for the isotope, barns, 10 cm
0 = fractional abundance of the target isotope
1-e- = saturation factor
e -Xt= decay factor
W = weight in grams
are the same for both the comparator and the unknown samples, except those
for weight (W) and activity (A), then a simplified equation can result:
W of U238 in Test Sample Np239 Radioactivity in Test Sample (2)
W of U in Comparator Sample Np239 Radioactivity in Comparator Sample
Discussion
The high sensitivity of the activation analysis method(3) makes it
possible to see low concentrations of many elements including uranium. In
this report the limit of sensitivity is not approached from the concentration
of the uranium in the graphite, but rather from the sample weight used (as
shown from the results presented in Table I). Nondestructive methods of
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Bate, L.C.; Hampton, W.J. & Leddicotte, G.W. NON-DESTRUCTIVE ANALYSIS OF URANIUM IN GRAPHITE FUEL ELEMENTS BY NEUTRON ACTIVATION, report, November 28, 1961; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1060802/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.