Chemical mitigation of the transmutation problem in crystalline nuclear waste radiophases

E. R. Vance, Rustum Roy, John G. Pepin, Dinesh Kumar Agrawal

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Certain deleterious effects on a solid nuclear waste form, though not yet quantitatively defined, could occur due to transmutations of the type 137Cs+137Ba2+ and 90Sr2+90Zr4+ (of half-life, t1/2, approximately 30 years in both cases). The relevant causes of such possible effects are the valence and size changes. In this paper, a chemical mitigation strategy is explicitly formulated: if the transmuting species can be incorporated in a multiple-cation host, in which one of the inert cations is a variable-valence transition metal, the valence-change aspect of transmutation can be mitigated by a complementary valence change of the transition metal ion. A generalized scheme is: {Mathematical expression} where R is a transition metal. The present work involved chemically simulating the transmutation and then attempting to find a Cs- or Sr-bearing single-phase host which would remain single-phase after the transmutation had occurred. Of several structures investigated, perovskite appears to be promising as the A-site can accommodate the approximately 20% size change which occurs when Cs decays to Ba. Ta and Nb were used as the variable-valence ions in the B-site. The application of the results to unpartitioned and partitioned nuclear wastes is discussed.

Original languageEnglish (US)
Pages (from-to)947-952
Number of pages6
JournalJournal of Materials Science
Volume17
Issue number4
DOIs
StatePublished - Apr 1 1982

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Radioactive Waste
Radioactive wastes
Transition metals
Crystalline materials
Cations
Bearings (structural)
Positive ions
Solid wastes
Perovskite
Metal ions
Ions

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Vance, E. R. ; Roy, Rustum ; Pepin, John G. ; Agrawal, Dinesh Kumar. / Chemical mitigation of the transmutation problem in crystalline nuclear waste radiophases. In: Journal of Materials Science. 1982 ; Vol. 17, No. 4. pp. 947-952.
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Chemical mitigation of the transmutation problem in crystalline nuclear waste radiophases. / Vance, E. R.; Roy, Rustum; Pepin, John G.; Agrawal, Dinesh Kumar.

In: Journal of Materials Science, Vol. 17, No. 4, 01.04.1982, p. 947-952.

Research output: Contribution to journalArticle

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