Absorption spectra of radiation products (Cd+, Pb+, I−2) in sodium metaphosphate glasses

Barkatt, Aaron; Kobayashi, Yoshimitsu; Rabani, Joseph

doi:10.1080/00337577808240854

Cited by 1 publication

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“…Little attention has also been paid to the effect of radiolysis products such as H 2 , H 2 O 2 , HNO 3 , and free radicals, which can also dramatically alter solution reactivity and the leach rate of the waste form. One notable exception is the study by Barkatt et al 29 in which deleterious effects on both glass and ceramic leaching were demonstrated in a g radiation field. These and other studies have led to a general acceptance that in a radiation field, oxidizing agents H 2 O 2 and HNO 3 can be generated in the presence of water and dissolved gases.…”

Section: Introductionmentioning

confidence: 99%

Cesium Release From Tungstate and Titanate Waste Form Materials in Simulated Canister Corrosion Product‐Containing Solutions

Luca

Zhang

Drabarek

et al. 2007

Journal of the American Ceramic Society

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The leaching of two potential 137Cs waste form ceramics (Cs‐containing hexagonal tungsten bronze (HTB) and hollandite) has been investigated in Fe(NO3)3 solutions of increasing concentration at 150°C over a period of 4 days. These ceramics contain within their structures reduced Mo5+/W5+ and Ti3+ species for the HTB and hollandite, respectively, which therefore might render them susceptible to oxidation‐induced leaching. Elucidation of the extent and the mechanism of leaching of the Cs from these ceramics in the REDOX active iron nitrate medium has been investigated. Cesium (Cs) leached severely from both the Cs‐loaded HTB and hollandite materials in iron nitrate solutions with virtually all of the immobilized Cs being extracted from both waste form materials in a period of 4 days at 150°C. In the case of hollandite, conversion to ilmenite and hematite was observed at low concentrations and was virtually complete in 0.5 mol/L Fe(NO3)3 over 4 days. In the case of the HTB, all of the Cs was extracted presumably by an ion‐exchange mechanism because the structure of this oxide remained intact and iron was found in the composition. Iron oxide with a hematite structure was also easily observed in the reacted sample at high solution iron concentrations. It is shown that the leach resistance of the Cs‐containing HTB can be improved by substitution of up to 20% Ti for W.

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Section: Introductionmentioning

confidence: 99%