Long term leaching of silicate systems: testing procedure, actinides behaviour and mechanism
Creators
- 1. Commission of the European Communities, Karlsruhe (Germany, F.R.). European Inst. for Transuranium Elements
Description
High-level waste borosilicate glasses and medium-level waste cement products have been leached with various aqueous solutions at ambient temperature. The leach rates of americium and plutonium are determined as well as the behaviour of the actinides in the boundary surface glass/leachant and in the leachant itself. Methods like light-scattering photometry and differential refractometry, molecular filtration, scanning electron microscopy and α-spectrometry of the energy-loss of α-particles in thin layers have been applied. From the experimental results a general model for the leaching mechanism has been established. A critical review of leach test procedures is accomplished aiming at the improvement of common tests with respect to the extrapolation of the obtained leach test data to final disposal safety considerations. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Hochradioaktive Borosilikatglaeser und mittelradioaktive Zementprodukte wurden mit verschiedenen waessrigen Loesungen bei Raumtemperatur ausgelaugt. Fuer Americium und Plutonium wurden die Auslaugraten bestimmt als auch das Verhalten der Aktiniden in der Phasengrenzflaeche Glas/Auslaugmedium und im Auslaugmedium selbst. Angewendet wurden Messtechniken wie Streulichtphotometrie und Differential-Refraktometrie, Molekularfiltration, Rasterelektronmikroskopie und α-Spektrometrie ueber den Energieverlust von α-Teilchen in duennen Schichten. Aus den experimentellen Ergebnissen wird ein allgemeines Modell fuer den Auslaugmechanismus abgeleitet. Eine kritische Betrachtung von Auslaugtestverfahren wird mit dem Ziel durchgefuehrt, die bekannten Verfahren zu verbessern und eine Extrapolation der Auslaugtestergebnisse in Hinblick auf Sicherheitsbertrachtungen fuer die Endlagerung zu ermoeglichen. (orig.)
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Additional details
Publishing Information
- Imprint Pagination
- 60 p.
- Report number
- KFK--2456
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 9354352
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- ACTINIDES; AMERICIUM; AUTORADIOGRAPHY; BORON SILICATES; CEMENTS; ELECTRON MICROSCOPY; GLASS; IMAGES; LEACHING; MICROSTRUCTURE; PHOTOMETRY; PLUTONIUM; RADIOISOTOPES; SPECTROSCOPY; SURFACES
- Descriptors DEC
- BORON COMPOUNDS; BUILDING MATERIALS; CRYSTAL STRUCTURE; DISSOLUTION; ELEMENTS; ISOTOPES; METALS; MICROSCOPY; OXYGEN COMPOUNDS; SEPARATION PROCESSES; SILICATES; SILICON COMPOUNDS; TRANSPLUTONIUM ELEMENTS; TRANSURANIUM ELEMENTS
Optional Information
- Notes
- 27 figs.; 6 tabs.; 7 refs.
- Secondary number(s)
- EUR--5509e.