نتایج جستجو برای: fission of uranium
تعداد نتایج: 21167870 فیلتر نتایج به سال:
Using a recently developed approach for numerical simulation of radiation-induced oxidative dissolution spent nuclear fuel, we have explored the impact three possible contributions to inhibiting effect molecular hydrogen. The are (1) on oxidant production in irradiated water, (2) reduction oxidized uranium catalyzed by noble metal inclusions (fission products) and (3) reaction with surface-boun...
Ultra-low doses and dose- rates of ionizing radiation are effective in preventing disease which suggests that they also may be effective in treating disease. Limited experimental and anecdotal evidence indicates that low radiation doses from radon in mines and spas, thorium-bearing monazite sands and enhanced radioactive uranium ore obtained from a natural geological reactor may be useful in tr...
Utilizing (p,d) and (p,t) reactions to obtain (n, f) cross sections in uranium nuclei via the surrogate-ratio method The surrogate ratio method has been tested for (p, d) and (p, t) reactions on uranium nuclei. 236 U and 238 U targets were bombarded with 28-MeV protons and the light ion recoils and fission fragments were detected using the Silicon Telescope Array for Reaction Studies detector a...
This study investigates actinide burning in a standard lattice PWR. It assumes that after the first loading of depleted uranium, plutonium and minor actinides, only the fission products are removed and only depleted uranium and the plutonium/minor actinide mixture are added. The relative concentrations of plutonium and minor actinide feed are always maintained the same as PWR discharge fuel aft...
Thin targets of 238U were bombarded with 45, 55, 65 and 69 MeV protons at the Cyclotron and Radioisotope Center (CYRIC) of Tohoku University in Japan. Gamma rays emitted from the fission products were recorded and analyzed by using gamma spectroscopy. Then, the cross sections for the formation of fission products, fragment mass distributions, and total fission cross sections were measured. Spec...
The tsunami after the 2011 Tohoku earthquake devastated a vast coastal area of eastern Japan. The Fukushima Daiichi nuclear reactor suffered meltdowns of its uranium fuel rods, resulting in the release of radioactive isotopes. One of the most environmentally critical isotopes released was strontium-90 (90Sr), a fission product of uranium and plutonium which has a half-life of 29 years, thus rem...
Radon is the oldest drug used by mankind. Ceremonial donations excavated at the hot radon springs in the Gastein valley, Austria, originate from the younger stone age. Today some 50 000 patients suffering from rheumatic deceases like ankylosing spondilytis are visiting the Radon therapy at Gastein, a few hundred thousands per year all over the world. Other radon therapies are located in Japan a...
The fission fragment angular distributions have been measured for proton-induced fission of 209Bi and 197Au nuclei using surface barrier detectors at several energies between 25 MeV and 30 MeV. The experimental anisotropies are found to be in agreement with the predictions of the Standard Saddle-Point Statistical Model (SSPSM). The fission cross sections of 209Bi 197Au nuclei were also measur...
Grain morphologies such as grain size and aspect ratio in uranium-based metallic fuels are important microstructural features that can impact various fuel performance properties fission-gas-induced swelling, thermal transport, high burnup structure formation, radiation resistance. Accurate prediction of the requires knowledge critical growth parameters boundary (GB) mobility anisotropy. In this...
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