Thorium is an element for possible use as nuclear fuel, because of the fertile property of Th-232, which could convert into U-233 after neutron capture and beta decays. However, thorium based fuels have not been successfully implemented, because of the high cost and the higher complexity compared with once-through uranium fuel. Therefore, the focus of this thesis is on thorium for use in tradit...

Neutronics calculations have been performed of the MYRRHA ADS Reactor with a thorium-based fuel mixture, using simulation programs MCNPX (Waters, 2002) and Geant4 (Agostinelli, 2003). Thorium is often considered for systems, this first evaluation possibilities thorium based fuels reactor design which has developed in detail. It also extends application widely-used program to geometry thorium. A...

In the 1930s and 1940s the radioactive contrast material colloidal thorium dioxide (Thorotrast) was frequently used in radiographic examinations. The agent was used mainly for angiography and to a lesser extent for myelography, ventriculography, pyelography, and hepatolienography. The late clinical complications and conventional radiographic manifestations of thorium administration have been we...

heavy water plus neutral current additive to an activity level of one decay per day per tonne ofD^O (DDT) for the thorium chain and(5(TpDTs for the uranium chain. /O jL^ It is equally important to be able to monitor these activity levels, by some form of ^f radioactive assay. From the point of view of purification the critical isotopes are 2 y year ^Th in the thorium chain (see Fig. 1) and 1600...

Preparation, characterization, and application of a novel coated graphite rod thorium selective electrode based on thorium 8-hydroxyquinolate [thorium oxinate, Th(C9H6NO)4.2H2O] complex ionophore as a sensing material, dioctylphthalate (DOP) as a solvent mediator, and PVC as a matrix have been developed. The coated graphite rod electrode exhibits a linear Nernstian response over the concentrati...

Lunar Prospector gamma-ray spectrometer spectra along with counting rate maps of thorium, potassium, and iron delineate large compositional variations over the lunar surface. Thorium and potassium are highly concentrated in and around the nearside western maria and less so in the South Pole-Aitken basin. Counting rate maps of iron gamma-rays show a surface iron distribution that is in general a...

Sir, Thorium X, a natural isotope of radium, was the main radiotherapeutic modality for treating vascular lesions of the skin including port-wine stain (PWS) available to dermatologists during the 1930s to 1950s. It disappeared from dermatological practice around the 1960s, and the chapter on thorium X was considered closed (1, 2). However, occasionally long-term sequelae have been described (2...

The extraction of thorium from aqueous solution was studied using the organic extractant trioctyl phosphine oxide (TOPO) dissolved in cyclohexane. The parameters affecting the extraction, determination and stripping of Th (IV) included type of extractant, shaking time, extractant concentration, pH, aqueous to organic phase ratio (A/O), temperature, certain interfering ions and stripping agents....