Exchange of oxygen stable isotopes (δ18O values) between precipitation waters and uranium oxides is governed by thermodynamics or kinetics. It has been assumed that meteoric waters can be related to precipitation waters in uranium ore concentrates and their calcined and reduced uranium oxide products. With this assumption, the δ18O values of uranium materials could provide forensic signatures that identify the production history and geolocation of nuclear materials. To further exploit the potential of δ18O values in nuclear material analysis, this study examines the oxygen stable isotope exchange in two UOCs, magnesium diuranate (MDU) and sodium diuranate (SDU). MDU and SDU were synthesized from solutions of uranyl nitrate hexahydrate using precipitation waters with unique oxygen isotope compositions. The structures of the MDU and SDU were analyzed using powder X-ray diffraction (p-XRD) and thermal mass loss curves, while the δ18O values of waters generated during thermal decomposition were analyzed using a thermogravimetric analyzer coupled to an isotope ratio infrared spectrometer (TGA-IRIS). By p-XRD, the MDU was uniform and amorphous across all syntheses with residual crystalline material incorporated as a minor component. Combined with the TGA results, all of the MDU is likely amorphous MgU2O7·3H2O with MgO impurities present throughout. In contrast, the SDU synthesis resulted in multiple phases with many samples exhibiting crystalline phases including a combination of Na(UO2)4O2(OH)5·5H2O and Na2(UO2)6O4(OH)6·8H2O with a Na2U2O7 minor phase. A small fraction of the SDU samples were amorphous with no crystalline XRD peaks observed. Mass loss curves of the SDU samples revealed that the amorphous samples contained inclusions of similar crystalline phases compared to the crystalline materials. The uniformity of the MDU samples enabled highly reproducible measurements of δ18O values of the water vapor yielded from two dehydration events at 170 °C and 500 °C. In contrast, the multiphase composition of the SDU samples resulted in poor reproducibility in δ18O values. Neither system revealed any correlation between the δ18O values of precipitation water and the waters released during dehydration of the UOCs.
RESUMENLos trabajos de prospección y de fotointerpretación han permitido localizar un nuevo yacimiento en el entorno de Sasamón, que pudo estar relacionado con la fundación de la ciudad y perduró en el tiempo como indica la presencia de terra sigillata hispánica altoimperial y terra sigillata hispánica tardía. El yacimiento representa un elemento novedoso dentro del proceso de ocupación del espacio en la región, según una estrategia claramente romana. En este trabajo, además de aspectos metodológicos, se aborda el estudio de los materiales, planteando algunas hipótesis sobre su finalidad y cronología. SUMMARYPedological surveys and oblique aerial image interpretation have led us to the location of a new site in the suburban area of Sasamón. Its original function may have been related with to the foundation of the city of Segisamo and afterwards lasted throughout several centuries according to the presence of Late Hispanic sigillata. The site represents new findings on the Roman settlement pattern in the area. In addition to methodological issues, this paper addresses the study of the material culture in order to propose hypothesis about function and chronology.PALABRAS CLAVES: prospección intra-site, fotografía aérea, cerámica romana, asentamiento rural, Hispania Citerior.
Las imitaciones de producciones hechas en materiales preciados o preciosos en otras realizadas en soportes más baratos, pero con elevado grado de similitud es común en todas las épocas. Las fuentes clásicas mencionan vasos en piedra imitados en vidrio. En este trabajo presentamos algunos ejemplos de este fenómeno en Augusta Emerita, donde se constata la presencia de variedades locales junto a piezas de talleres foráneos. En la colección emeritense se distinguen distintos tipos de producciones dentro de las imitaciones, como los vidrios opacos y los denominados “vidrios mosaico”.
La construcción naval española tiene en el siglo XVII una época de referencia inexcusable. Este periodo, que resultará clave para explicar los problemas que se resolverán con el desarrollo de la Arquitectura Naval del siglo XVIII, coincide en su totalidad con la actividad constructora del astillero de Colindres, en Cantabria.
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