Electron beam irradiation effects in Trombay nuclear waste glass

Mohapatra, M.; Kadam, R.M.; Mishra, R.; Dutta, Dhanadeep; Kaushik, C.P.; Kshirsagar, R.J.; Tomar, B. S.; Godbole, S.V.

doi:10.1016/j.nimb.2011.06.009

Cited by 41 publications

(45 citation statements)

References 30 publications

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“…The intense and isotropic signal observed at g = 1.99 disappeared very quickly on annealing the sample at temperatures higher than 400 K. This signal was having a negative “ g ” shift compared to free electron g value of 2.0023 and was named an ET center. Based on the characteristics, it was attributed to either an F + center or an electron self trapped on a cation …”

Section: Resultsmentioning

confidence: 99%

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Gamma Radiation‐Induced Changes in Trombay Nuclear Waste Glass Containing Iron

Mohapatra

Kadam

Mishra

et al. 2012

Int J of Appl Glass Sci

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Alkali-based barium borosilicate glasses having similar composition to the Trombay nuclear research reactor waste base glass containing iron were prepared and irradiated by gamma rays. The radiation-induced defect centers were investigated using electron paramagnetic resonance (EPR) technique. The results showed the formation of silicon hole centers and electron trap centers apart from boron-based oxy hole centers in the glass due to the irradiation. The EPR Hamiltonian parameters for these radicals were evaluated by simulation technique using Bruker SIMFONIA computer program. Glasses with varying iron content were irradiated with the same dose to evaluate the effect of iron content on the defect center concentration. A spin counting technique was employed to evaluate the number of defect centers produced in each glass. It was observed that the defect center concentration reduced as a function of increasing iron content. This was attributed to the charge trapping process of ferric ions in the amorphous system. *manojm@barc.gov.in

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Section: Resultsmentioning

confidence: 99%

“…Temperature variation studies of the EPR spectra were conducted using a B‐VT 2000 Eurotherm temperature controller (Bruker BioSpin GmbH, Rheinstetten, Germany) unit attached to the spectrometer. Details regarding the simulation experiments are discussed else where …”

Section: Methodsmentioning

confidence: 99%

Gamma Radiation‐Induced Changes in Trombay Nuclear Waste Glass Containing Iron

Mohapatra

Kadam

Mishra

et al. 2012

Int J of Appl Glass Sci

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“…Radiation and spectral characteristics of sapphire produced by various methods have been studied [10][11][12]. Electron paramagnetic resonance (EPR) spectroscopy has also been employed to study the irradiation effect [13][14][15][16][17], which is more sensitive to paramagnetic defects, such as exchange-coupled ion pairs and unpaired electron in sapphire.…”

Section: Introductionmentioning

confidence: 99%

Electron paramagnetic resonance in gamma-ray, electron and neutron flux irradiated sapphire

Zhang

et al. 2012

Nuclear Instruments and Methods in Physics Research Section B:

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“…Many of the studies have been focused on the incorporation of high sulfur nuclear waste into the borosilicate glass system used in Trombay, India [3,14,15] . As in a silicate glass system, Raman spectroscopy has shown that the sulfate is in the form of sulfate tetrahedrons and it is located at the edge of the glass network, without bonding to the glass network in borosilicate glass systems [16] .…”

Section: Sulfur Dissolution In Borosilicate Glass Systemsmentioning

confidence: 99%

“…In the case where Pb was found to have no effect, alkaline earth oxides such as barium oxide (BaO) and calcium oxide (CaO) improved sulfate solubility without phase separation [3] . At the Bhabha Atomic Research Center (BARC) in Trombay, a barium based borosilicate glass composition has been developed which reduces the problem of phase separation of sulfate from their nuclear waste [14] . Cesium (Cs) additions to borosilicate glass systems have also been compared to Na additions to borosilicate glass systems.…”

Section: A Additives To Borosilicate Glass Systems To Increase Sulfumentioning

confidence: 99%

Additive Testing for Improved Sulfur Retention: Preliminary Report

Amoroso¹,

Fox²

2011

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The Savannah River National Laboratory is collaborating with Alfred University to evaluate the potential for additives in borosilicate glass to improve sulfur retention. This preliminary report provides further background on the incorporation of sulfur in glass and outlines the experiments that are being performed by the collaborators. A simulated waste glass composition has been selected for the experimental studies. The first phase of experimental work will evaluate the impacts of BaO, PbO, and V 2 O 5 at concentrations of 1.0, 2.0, and 5.0 wt % on sulfate retention in simulated high level waste borosilicate glass. The second phase of experimental work will evaluate the effects of time at the melt temperature on sulfur retention. The resulting samples will be characterized to determine the amount of sulfur remaining as well as to identify the formation of any crystalline phases. The results will be used to guide the future selection of frits and glass forming chemicals in vitrifying Department of Energy wastes containing high sulfur concentrations. SRNL-STI-2011-00524Revision 0 vi LIST OF TABLES IntroductionSulfur has a low solubility in borosilicate glasses. This presents a significant challenge to the U.S. Department of Energy (DOE) immobilization campaigns for wastes with high sulfur concentrations since borosilicate glass is being used to vitrify high level radioactive waste (HLW) at the Savannah River Site (SRS) and is planned for use in vitrifying wastes at Hanford. A more thorough understanding of the incorporation of sulfur in the borosilicate glass network (and the issues that hinder its incorporation) could lead to improvements in sulfur retention, allowing for a higher level of waste loading in the glass.The Savannah River National Laboratory (SRNL) is collaborating with Alfred University (AU) to evaluate the potential for additives in the borosilicate glass frit or glass forming chemicals to improve sulfur retention. This preliminary report provides further background on the incorporation of sulfur in glass and outlines the experiments that will be performed by the collaborators. AU has completed a survey of relevant literature and provided recommendations for the experimental work. That document is included as Appendix A. The experimental work will be performed using simulated, non-radioactive glasses, with the intent of identifying modifications that can be made to the frit compositions recommended for future operation of the Defense Waste Processing Facility (DWPF) at SRS for improved sulfur retention. SRNL-STI-2011-00524Revision 0 2 Evaluation of Frit AdditivesCollaborators at AU have recommended that three frit additives, BaO, PbO, and V 2 O 5 , be evaluated for potential improvements in sulfate retention. Batching, melting, and some characterization of test glasses for this phase of the experimental work will be completed by AU. The recommended additives will be added in concentrations of 1.0, 2.0, and 5.0 wt %. The concentrations of the frit components in the glass will be reduced propo...

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Electron beam irradiation effects in Trombay nuclear waste glass

Cited by 41 publications

References 30 publications

Gamma Radiation‐Induced Changes in Trombay Nuclear Waste Glass Containing Iron

Gamma Radiation‐Induced Changes in Trombay Nuclear Waste Glass Containing Iron

Electron paramagnetic resonance in gamma-ray, electron and neutron flux irradiated sapphire

Additive Testing for Improved Sulfur Retention: Preliminary Report

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