Preparation and characterization of {sup 238}Pu-ceramics for radiation damage experiments

Strachan, DM; Scheele, None RD; Buchmiller, WC; Vienna, J.D.; Sell, RL; Elovich, None RJ

doi:10.2172/756592

Cited by 6 publications

(18 citation statements)

References 4 publications

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“…14 Pu, as in current ongoing studies, 138,139 or actual actinide host phases containing 10 wt % 239 Pu ͑or a similar activity from other actinides͒. Results from the ongoing study on 238 Pu-containing samples 138,139 may provide some validation for these predictions. A significant decrease in T c (th) is observed, particularly for the 239 Pu dose rates that are representative of conditions for actinide-host phases.…”

Section: E Model Predictionssupporting

confidence: 51%

“…7 to 9 and 13, and corrected for dose rate, as was done in Fig. 14 Pu, as in current ongoing studies, 138,139 or actual actinide host phases containing 10 wt % 239 Pu ͑or a similar activity from other actinides͒. Results from the ongoing study on 238 Pu-containing samples 138,139 may provide some validation for these predictions.…”

Section: E Model Predictionsmentioning

confidence: 62%

“…One study was on CaPuTi 2 O 7 with the fluorite-derivative structure, 44,45 and the other is a current study on several 238 Pu-containing pyrochlore-based ceramics. 138,139 Natural minerals also can contain large concentrations of U and Th impurities ͑up to 30 wt. %͒; thus, natural pyrochlores can serve as analogues for self-radiation effects.…”

Section: B Irradiation Methodsmentioning

confidence: 99%

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Nuclear waste disposal—pyrochlore (A2B2O7): Nuclear waste form for the immobilization of plutonium and “minor” actinides

Ewing

Weber

Lian

2004

Journal of Applied Physics

997

723

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During the past half-century, the nuclear fuel cycle has generated approximately 1400 metric tons of plutonium and substantial quantities of the ''minor'' actinides, such as Np, Am, and Cm. The successful disposition of these actinides has an important impact on the strategy for developing advanced nuclear fuel cycles, weapons proliferation, and the geologic disposal of high-level radioactive waste. During the last decade, there has been substantial interest in the use of the isometric pyrochlore structure-type, A 2 B 2 O 7 , for the immobilization of actinides. Most of the interest has focused on titanate-pyrochlore because of its chemical durability; however, these compositions experience a radiation-induced transition from the crystalline-to-aperiodic state due to radiation damage from the alpha-decay of actinides. Depending on the actinide concentration, the titanate pyrochlore will become amorphous in less than 1000 years of storage. Recently, systematic ion beam irradiations of a variety of pyrochlore compositions has revealed that many zirconate pyrochlores do not become amorphous, but remain crystalline as a defect fluorite structure-type due to disordering of the A-and B-site cations. The zirconate pyrochlores will remain crystalline even to very high doses, greater than 100 displacements per atom. Systematic experimental studies of actinide-doped and ion beam-irradiated pyrochlore, analyses of natural U-and Th-bearing pyrochlore, and simulations of the energetics of the disordering process now provide a rather detailed understanding of the structural and chemical controls on the response of pyrochlore to radiation. These results provide a solid basis for predicting the behavior and durability of pyrochlore used to immobilize plutonium.

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Section: E Model Predictionssupporting

confidence: 51%

Section: E Model Predictionsmentioning

confidence: 62%

Section: B Irradiation Methodsmentioning

confidence: 99%

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Nuclear waste disposal—pyrochlore (A2B2O7): Nuclear waste form for the immobilization of plutonium and “minor” actinides

Ewing

Weber

Lian

2004

Journal of Applied Physics

997

723

View full text Add to dashboard Cite

show abstract

“…The latter two were also included in the formulations with Pu and U because they are neutron absorbers. In this paper, we briefly describe the methods used to prepare the 238 Puand 239 Pu-bearing ceramic specimens; additional details may be found in Strachan et al [38]. Reagent-grade constituent oxides and hydroxides, except Pu, were mixed to the correct proportions.…”

Section: Experimental Methodsmentioning

confidence: 99%

Radiation damage effects in candidate titanates for Pu disposition: Pyrochlore

Strachan

Scheele

Buck

et al. 2005

Journal of Nuclear Materials

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“…Some fraction of the Pu that the United States has declared as being surplus to its defense needs is to be converted to a titanate ceramic in the form of disks. In December 1999, approximately 200 test specimens were made to study the effect of radiation damage on the behavior of titanate ceramics proposed for immobilizing Pu (Strachan et al 2000). These ceramic disks are to be placed in stainless steel cans that will be loaded into magazines.…”

Section: Introductionmentioning

confidence: 99%