نتایج جستجو برای: 233u fissile material
تعداد نتایج: 364460 فیلتر نتایج به سال:
Optimisation Studies of Accelerator Driven Fertile to Fissile Conversion Rates in Thorium Fuel Cycle
The need for proliferation-resistance, longer fuel cycles, higher burn up and improvedwaste form characteristics has led to a renewed worldwide interest in thorium-based fuels and fuel cycles. In this paper the GEANT4 Monte Carlo code has been used to simulate the Thorium-Uranium fuel cycle. The accelerator driven fertile to fissile conversion rates have been calculated for various geometries. ...
In the frame of the accountancy measurements of the fissile materials, reliable determinations of the plutonium and uranium content in spent nuclear fuel are required to comply with international safeguards agreements. Large-sized dried (LSD) spikes of enriched 235U and 239Pu for isotope dilution mass spectrometry (IDMS) analysis are routinely applied in reprocessing plants for this purpose. A ...
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...
We introduce an age-structured asexual population model containing all the relevant features of evolutionary aging theories. Beneficial as well as deleterious mutations, heredity, and arbitrary fecundity are present and managed by natural selection. An exact solution without aging is found. We show that fertility is associated with generalized forms of the Fibonacci sequence, while mutations an...
The upcoming disposal of spent nuclear fuel in Finland creates new challenges for safeguards. Part the national safeguards concept geological repositories, developed by STUK — Radiation and Nuclear Safety Authority, is non-destructive assay (NDA) verification all items before disposal. proposed system a combination PGET (Passive Gamma Emission Tomography), PNAR Neutron Albedo Reactivity) weight...
The purpose of this article is to set the context for this special issue of Disaster Medicine and Public Health Preparedness on the allocation of scarce resources in an improvised nuclear device incident. A nuclear detonation occurs when a sufficient amount of fissile material is brought suddenly together to reach critical mass and cause an explosion. Although the chance of a nuclear detonation...
IN THIS ISSUE In this issue of Physics & Society, we continue our series on the risks of nuclear weapons after the Cold War. In their article Illicit Trafficking of Weapons-Usable Nuclear Material: Facts and Uncertainties, Lyudmila Zaitseva and Friedrich Steinhausler have provided us with a very detailed look at what is known about the smuggling of fissile materials. They have also provided a r...
A number of scientific discoveries regarding the nature of atoms and their characteristics were made over a relatively short period of time. These lead to the splitting of the atom and the realization that potentially large amounts of energy could be released in the fissioning of certain nuclides. Work on this was expedited in secret during the Second World War during which time the first nucle...
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