Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision Page: 98 of 205
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FISSILE UNITS WITH VARIOUS REFLECTORS
RF:i.fCTORS ABOITT URANIUl AlD Pl'TON11 AETA L
critical l m11aSSes of unioderated l'(93.5 lmetal spheres are given for various reflectors as
fumctiuns of reflect r thickness in Fig. 42 and Table 28, These data originated at Los
Al mos0.3'"a.l and Livermiore.51 Table 29 adds critical masses of uranium metal at
various 3"t" enrichnents and densities, also reported from I os Alamos.20
Experiments at Rocky Flats give critical condit ions for various steel-oil (Texaco 522) coum-
posit e reflect ors about spheres of highly enriched urauni inet al surrounding a steel ball .1
Irregularities appear in the :curve of critical mass vs thickness of st eel reflect or within oil at
steel thicknesses bet ween 2 and 4 cmt. These irregularities are attributed to the resonance
in the neutron elastic scattering cross section of iron.
From Aldermaston, the crical dimensions of L'(45) metal surrounded by various nonhy-
drogenous reflectors are given in Table 30, and Table 31 gives critical data for U(37.67)
metal cubes surrounded with various reflectors.'38,139
The less-complete information about reflected spheres of 33U metal, 6-phase 23Pm,, and a-
phase 23Ptu can be represented, as in Fig. 43, in terms of the critical mass of U(93.5) metal
enclosed in a reflect or of the same composit ion and thickness. These correlations (based
on data from Aldermaston.' Los Alanmos,20,*135136,140,14' Livermore'41"42 and supported
by Rocky Flats"), which show no systematic distinction between nonmoderating and
moderating reflectors, provide a means of estimating critical masses of the other metals
from the more abundant data ' ,r enriched uranium. Reasonably complete list ings of crit.iral
masses of plutonium metal and =33t1 metal appear in Tables 32 and 33.
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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/m1/98/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.