A method of epithermal neutron activation analysis for uranium and thorium is discussed in relation to other rapid analytical methods for these elements. Caledonian granites are divided into four main groups on the basis of U and Th contents: (a) a group of evolved late granites with high U and Th contents and high Th/U ratios, (b) a group of uranium-enriched mineralized granites, (c) granites ...

Surface-modified TiO2 nanofibers (NFs) with tunable visible-light photoactive catalysts were synthesised through electrospinning, followed by a sulfidation process. The utilization of sodium-based sulfidation precursors effectively led to the diffusion and integration of sulfur impurities into TiO2, modifying its band function. The optical band function of the sulfur-modified TiO2 NFs can be ea...

The current environmental and industrial contexts require constant revision improvement of hydrotreating processes for obtaining cleaner (bio)fuels through the development supported transition metal sulfide (TMS) catalysts. present work proposes a surface-science approach to describe surface-dependent genesis cobalt-promoted active phase (CoMoS) on α-Al2O3 single crystals used as surrogates γ-A...

Boron Neutron Capture Therapy (BNCT) [4, 5] is a form of a radiation therapy used for treatment of some kinds of cancer (mainly glioblastoma multiforme) which, due to their character, are hard to be extracted with surgical methods. The BNCT method involves the delivery of a capture compound − the B isotope is usually used – which preferentially concentrates in the cancer tissue, followed by the...

Abstract Filo del Sol is a composite porphyry-epithermal deposit, straddling the frontier between Argentina and Chile at latitude 28°29′ S, that has attracted great deal of recent attention because several drill intersections in excess 1 km long with unusually high Cu, Au, Ag grades. The deposit part 8.5-km-long, N- to NE-trending alignment porphyry high-sulfidation epithermal centers, which, t...

The discovery, using short wavelength infrared radiation (SWIR), that some low-sulfidation epithermal gold deposits are associated with hydrothermal alteration involving ammonium minerals, particularly buddingtonite ((NH4)AlSi3O8), has led to the suggestion may have been transported as a complex ammonia (NH3). speciation of in ammonia-rich solutions, however, received little attention from expe...

Abstract Mineral inclusions within native gold are features of lode occurrences that preserved in detrital particles. Inclusion assemblages populations particles placers from specific localities revealed through inspection polished sections, and assimilation robust data sets permits reconstruction the source mineralogy. differ considerably according to deposit type, various approaches have been...

Tungsten disulfide polycrystalline microfibers were successfully synthesized by a process involving electrospinning, calcination, and sulfidation steps. We used an aqueous solution of silicotungstic acid (H4SiW12O40) polyvinyl alcohol as precursors for the synthesis composite fibers needle-less electrospinning technique. The obtained green (av. diam. 460 nm) converted calcination in air to tung...