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Reflections on the criticality of special actinide elements [electronic resource].

Published
Richland, Wash. : Pacific Northwest Laboratory, 1987.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 8 : digital, PDF file
Additional Creators
Pacific Northwest Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
During recent years, the list of nuclides known to be capable of supporting a chain reaction has substantially increased. Since the criticality aspects for some of these nuclides differ in important respects from those of the most common fissile nuclides, /sup 235//sub 92/U, and /sup 239//sub 94/Pu, a new term, ''fissible'' was recently proposed in nuclear engineering to help distinguish differences. Activation energies for fission have been calculated for 41 of the actinide isotopes which are grouped according to four types of nuclides, those with even-Z, even-N, odd-Z, odd-N, odd-Z, even-N, and even-Z, odd-N. With the possible exception of /sup 237//sub 92/U, all fissible isotopes listed have even N. The activation energy for fission is less in the case of the even-Z, even-N isotopes, but almost without eception it is the odd-N isotopes that undergo fission with thermal neutrons and which constitute the principal criticality problem. This paper reviews the criticality and fissionability aspects of the fissile and fissible actinide isotopes. The criticality of aqueous mixtures of fissile and fissible isotopes also is briefly discussed, including limits for criticality control.
Report Numbers
E 1.99:pnl-sa-14610
E 1.99: conf-871045-11
conf-871045-11
pnl-sa-14610
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
04/01/1987.
"pnl-sa-14610"
" conf-871045-11"
"DE88003418"
International seminar on nuclear criticality safety, Tokyo, Japan, 19 Oct 1987.
Clayton, E.D.
Funding Information
AC06-76RL01830
View MARC record | catkey: 14368350