The leaching behavior of simulated HLW glass under repository condition

As the multibarrier system has been adopted to dispose HLW glass in geological formation in many countries, it was important to study the leaching behavior of vitrification under geological formation. This article describes the leaching behavior of simulated high level waste glass （90Nd/10）, which can incorporate 16 wt.% simulated HLW in five kinds of geological media, such as granite, cement, bentonite, Fe3O4, etc. The durable experimental results show that the glass had less mass loss in granite and more mass loss in bentonite after a two-year leaching test. The SEM/XEDS analysis shows some element distributions on the leached specimen＇s surface, i.e., Na, Si and Mg elements were reduced on the specimen＇s surface, whereas Ba, Al, and Fe were enriched on the specimen＇s surface.     

X-ray fluorescence and ion beam analysis of iridescent Art Nouveau glass – authenticity and technology

EDXRF analysis with subsequent multivariate data analysis proves useful for the determination of the authenticity of iridescent glass artifacts. Thus, clusters of the glass groups investigated were formed which can be associated with the glass manufacturers. By means of ion beam analysis with the external proton beam the producing technology of iridescent glass objects of the Art Nouveau glass manufacturer Loetz/Austria with so-called Papillon pattern was characterised in a non-destructive way. Due to the simultaneous application of PIXE and RBS the glass structure including a sequence of glass layers covered with a SnO₂-layer of approximately 50 nm thickness on the surface could be described.     

Comparisons of dosimetric properties between GD-300 series of radiophotoluminescent glass detectors and GR-200 series of thermoluminescent detectors

In order to compare the dosimetric properties of two kinds of solid state detectors used for monitoring ex- ternal exposures,experiments were performed for the GD-300 series of radiophotoluminescent glass detectors (RPLGD)and the GR-200 series of thermoluminescent detectors(TLD).X-rays and ~(137)Cs and ~(60)Coγ-rays were used to irradiate the RPLGDs and TLDs,their dose linearity,uniformity/reproducibility of signal,fading effect and energy dependence were compared.Both kinds of the detectors have generally good dosimetric properties.The dose linearity and energy dependence of the GD-351 dosimeters and the TLDs are nearly the same,but the RPLGD is much better than the TLD in terms of the uniformity and fading effect.     

Thermoluminescent response of gamma irradiated Na+–Cu+ ionexchanged silicate glass in large dose range

The introduction of metals into vitreous matrices is the origin of various interesting phenomena; in particular, the presence of copper ions in glass has been the subject of considerable research because of its numerous applications. The ion-exchange process is primarily used to introduce copper ions into glass matrices. The thermoluminescence(TL) of silicate glass was studied to evaluate its potential as gamma-sensitive material for dosimetric applications; the effect of copper doping on the th...     

Influence of pre-irradiation annealing and Lix–Co(1−x)–O thin film deposition on the TL response of soda lime glass

Effects of pre-irradiation annealing and deposition of a thin film of Li_x–Co_(1−x)–O on soda lime glass substrate are studied using the thermoluminescence technique, at low gamma radiation doses. Simple but similar glow curves were obtained with a single glow peak in all cases. Glow peaks occurred within the temperature range of 266 and 288 °C depending on sample treatment and gamma dosage. Within the studied gamma radiation dose range of 0.86–4.29 mGy, the heated soda lime glass consistently showed the highest TL response, while that from the film deposited sample was the least. At a dose of 0.86 mGy, a 41.8% enhancement and a 56.7% loss in signal over those from ordinary soda lime glass were recorded for annealed and film deposited samples respectively. Peak shift to higher temperatures were also observed in the two treated samples, relative to blank. These we have attributed to the increased diffusion of alkali ions in the annealed glass and exchange of impurity ions between the Li_x–Co_(1−x)–O thin film and the soda lime glass substrate, at high temperatures, resulting in increased formation of points and complex defects that could be either killer or radiative traps.