Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision Page: 55 of 205
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Uranium of Various Enrichments
Over the range of 235U enrichments, minimum critical masses of heterogeneous uranium
in water compare with homogeneous values as shown in Fig. 22. Below about 10% 2351
enrichment, heterogeneous critical masses are smaller than corresponding homogeneous
values. Heterogeneous minimum critical volumes (Fig. 23), diameters of infinite cylinders
(Fig. 24), and thicknesses of finite slabs (Fig. 25), however, are less than corresponding
homogeneous values throughout the entire enrichment range.
These figures, originally from Callihan, Ref. 9, have been modified to include the subse-
quent Oak Ridge experiments, in particular, the comparison at U(~ 5) noted earlier. As
a reminder, the minimum critical mass of U(4.95) metal rods latticed in water was 1.6 kg
235,"'78 Znd that of water-reflected U(5.00) solution was 2.0 kg 23.U. Further, hornoge-
neous values at 2.00 and 3.00 wt% enricliment are derived from ORNL experiments with
U(3.00)F paraffin and U(2.00)F-paraffin compacts."
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Paxton, H.C. & Pruvost, N.L. Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision, report, July 1, 1987; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1109879/m1/55/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.