Abstract The roles of 99g Tc in stars and nuclear fission reactors that 99m medicine were studied using neutrons provided from accelerators are reported. In addition to the critical role stars, we also describe related light nuclei such as 16 O, experimental studies on keV-neutron capture cross sections these performed keV a 3.2-MV Pelletron accelerator section Tc, is important nucleosynthesis ...

Thorium fueled Accelerator Driven Subcritical Reactors have been proposed as a more comprehensive alternative to conventional nuclear reactors for both energy production and for burning radioactive waste. Several new classes have been added by the authors to the GEANT4 simulation code, an extension which allows the state-of-the-art code to be used for the first time for nuclear reactor critical...

highly radioactive byproducts. Commercially, uranium is used in an enriched form (higher percentage of the fissile isotope U) and a depleted form (low percentage of U). Enriched uranium is used in nuclear reactors, while depleted uranium is used for military applications in munitions and armor. Uranium has low gastrointestinal absorption; absorbed uranium takes the form of uranyl ion for circul...

This effort is a continuation of the work of Task 3 (see pages 10 and 11), and the same overview applies. Advanced nuclear processes such as the transmutation of nuclear waste, fast reactors, liquid-metal-cooled reactors, and spallation neutron sources require advanced materials systems to contain them. The required structural materials must be stable in the presence of nonmoderating coolants. ...

The paper presents results of the study on economic aspects of the transition from the current nuclear energy system (NS) overwhelmingly based on the open nuclear fuel cycle (NFC) with thermal reactors to the NS with substantial inclusion of the closed NFC and balanced fleet of thermal and fast reactors. This transition will require pre-commercial investments (transition costs) which include RD...

Highly radioactive materials are at the core in many useful applications ranging from operating nuclear reactors (including fast breeder reactors) to vitrified high-level waste, which is currently stored and awaiting final disposal into dedicated facilities within deep geological formations [...]

For several decades, the United States has been without an ongoing program measuring levels of fission products in the body. Strontium-90 (Sr-90) concentrations in 2089 deciduous (baby) teeth, mostly from persons living near nuclear power reactors, reveal that average levels rose 48.5% for persons born in the late 1990s compared to those born in the late 1980s. This trend represents the first s...