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New technique for enhancing helium production in ferritic materials [electronic resource].

Published
Argonne, Ill. : Argonne National Laboratory, 1987.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 14 : digital, PDF file
Additional Creators
Argonne National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Analyses of iron samples irradiated up to 10/sup 27/ n/m/sup 2/ in HFIR found more helium than was expected from fast neutron reactions at high neutron fluences. The helium excess increases systematically with neutron exposure, suggesting a transmutation-driven process. The extra helium may be produced in two different ways, either by fast neutron reactions on the transmuted isotopes of iron or by a thermal neutron reaction with the radioactive isotope /sup 55/Fe. Radiometric and mass spectrometric measurements of the iron isotopes composing the irradiated samples have been used to determine limits on the cross sections for each process. Either of these processes can be used to enhance helium production in ferritic materials during irradiations in mixed-spectrum reactors by isotopically enriching the samples. Further work is needed to clarify the reaction mechanisms and helium production cross sections. Our measurements determined the thermal neutron total absorption cross section of /sup 55/Fe to be 13.2 +- 2.1 barns. 16 refs., 3 figs., 3 tabs.
Report Numbers
E 1.99:conf-871036-23
conf-871036-23
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Note
Published through SciTech Connect.
10/01/1987.
"conf-871036-23"
"DE88003048"
3. international conference on fusion reactor materials, Karlsruhe, F.R. Germany, 4 Oct 1987.
Greenwood, L.R.; Graczyk, D.G.; Kneff, D.W.
Funding Information
W-31109-ENG-38
View MARC record | catkey: 14753369