A Study of Radiation Effects in Curium-Doped Gd2Ti2O7 (Pyrochlore) and CaZrTi2O7 (Zirconolite)

1981 ◽  
Vol 11 ◽  
Author(s):  
J.W. Wald ◽  
P. Offemann
Keyword(s):  
Radiation Damage ◽  
Nuclear Waste ◽  
Radiation Effects ◽  
Laboratory Data ◽  
Primary Host ◽  
Waste Forms ◽  
Rare Earth Titanate ◽  
Effects Of Radiation ◽  
Similar Phase ◽  
Nuclear Waste Forms

Radiation effects studies in both glass and glass ceramic nuclear waste forms have identified a rare-earth titanate phase of the general formula (RE) 2Ti207 which is capable of acting as a host phase for actinides.1,2 Ringwood and co-workers3 have also proposed a structurally similar phase, zirconolite (CaZrTi2 07), as one of the primary host phases in the SYNROC waste form. Data from these and other previous studies, as well as mineralogical information available on these titanate phases, have not provided an unambiguous interpretation of the effects of radiation damage relative to nuclear waste forms. This paper reports new laboratory data concerning radiation damage effects in both of these phases.

scholarly journals Radiation Effects Issues Related to U.S. Doe Site Remediation and Nuclear Waste Storage

1994 ◽  
Vol 353 ◽  
Author(s):  
William J. Weber ◽  
Rodney C. Ewing
Keyword(s):  
Nuclear Waste ◽  
Radiation Effects ◽  
Nuclear Waste Storage ◽  
Radiation Fields ◽  
Waste Storage ◽  
Waste Forms ◽  
Site Restoration ◽  
Physical And Chemical ◽  
The Impact ◽  
Nuclear Waste Forms

AbstractSite restoration activities at DOE facilities and the permanent disposal of nuclear waste generated at the same DOE facilities involve working with and within various types and levels of radiation fields. Radionuclide decay and the associated radiation fields lead to physical and chemical changes that can degrade or enhance material properties. This paper reviews the impact of radiation fields on site restoration activities and on the release rate of radionuclides to the biosphere from nuclear waste forms.

scholarly journals A Review of Radiation Effects in Solid Nuclear Waste Forms

1983 ◽  
Vol 60 (2) ◽  
pp. 178-198 ◽  
Author(s):  
William J. Weber ◽  
Frank P. Roberts
Keyword(s):  
Nuclear Waste ◽  
Radiation Effects ◽  
Waste Forms ◽  
Nuclear Waste Forms

A Review of the Current Status of Radiation Effects in Solid Nuclear Waste Forms

1982 ◽  
Vol 15 ◽  
Author(s):  
William J. Weber
Keyword(s):  
Experimental Study ◽  
Nuclear Waste ◽  
Radiation Effects ◽  
Current Status ◽  
General Nature ◽  
Simulation Techniques ◽  
Waste Forms ◽  
Reported Data ◽  
Nuclear Waste Forms

ABSTRACTThe current status of radiation effects in solid nuclear waste forms is reviewed. The general nature of radiation effects and the simulation techniques used are briefly discussed. Recently reported data on radiation effects are presented and discussed, and those areas requiring further theoretical or experimental study are identified.

scholarly journals Ab Initio Investigation of Helium Mobility in La2Zr2O7 Pyrochlore

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 667
Author(s):  
Yanxia Lu ◽  
Qing Peng ◽  
Chenguang Liu
Keyword(s):  
Nuclear Waste ◽  
Density Functional ◽  
Minimum Energy ◽  
Elastic Band ◽  
Waste Forms ◽  
Band Method ◽  
And Migration ◽  
High Level ◽  
Migration Pathways ◽  
Nuclear Waste Forms

The α-decay of incorporated actinides continuously produces helium, resulting in helium accumulation and causing security concerns for nuclear waste forms. The helium mobility is a key issue affecting the accumulation and kinetics of helium. The energy barriers and migration pathways of helium in a potential high-level nuclear waste forms, La2Zr2O7 pyrochlore, have been investigated in this work using the climbing image nudged elastic band method with density functional theory. The minimum energy pathway for helium to migrate in La2Zr2O7 is identified as via La–La interstitial sites with a barrier of 0.46 eV. This work may offer a theoretical foundation for further prospective studies of nuclear waste forms.

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