نتایج جستجو برای: radioactive element
تعداد نتایج: 224303 فیلتر نتایج به سال:
A model coupling a three dimensional gas liquid compositional Darcy flow in a fractured porous medium, and a one dimensional compositional free gas flow is presented. The coupling conditions at the interface between the gallery and the porous medium account for the molar normal fluxes continuity for each component, the gas liquid thermodynamical equilibrium, the gas pressure continuity and the ...
This isotope of curium is radioactive and decays by the emission of an a-particle to form Pu2% which, in turn, is also radioactive. Cm242 has a half life of 150 days and its radioactive daughter, PUCK, has a half life of 50 years. This isotope of plutonium decays by the emission of an a-particle to form U234 which has a half life of 233,000 years. Shortly after the organization of the Atomic En...
Artificially produced radioactive iron is an extremely sensitive agent for use in following iron in the course of its changes in body metabolism, lending itself to studies of absorption, transport, exchange, mobilization, and excretion. The need of the body for iron in some manner determines the absorption of this element. In the normal dog when there is no need for the element, it is absorbed ...
The radioactive element astatine exists only in trace amounts in nature. Its properties can therefore only be explored by study of the minute quantities of artificially produced isotopes or by performing theoretical calculations. One of the most important properties influencing the chemical behaviour is the energy required to remove one electron from the valence shell, referred to as the ioniza...
Research carried out by me and my group over the last almost four decades are summarized here. The main emphasis of my work was and continues to be on plant physiology using radiation and radioisotopes. Plants live on water and inorganic elements. In the case of water, we developed neutron imaging methods and produced 15O-labeled water (half-life 2 min) and applied them to understand water circ...
We are developing a simulation of needle insertion and radioactive seed implantation to facilitate surgeon training and planning for brachytherapy for treating prostate cancer. Inserting a needle into soft tissues causes the tissues to displace and deform: ignoring these effects during seed implantation leads to imprecise seed placements. Surgeons should learn to compensate for these effects so...
A number of short-lived radioactive isotopes, which existed in the early solar system but are now extinct (e.g., Al (t1/2 = 0.74 Ma) Mg, Mn (t1/2 = 3.7 Ma) Cr, Hf (t1/2 = 9 Ma) W, Sm (t1/2 = 103 Ma) Nd), have proven useful for dating the relative ages of meteorites. Based on the ratio of the stable daughter isotope to a proxy isotope for the parent element, this method only provides relative ag...
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