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questions :What is an atom?
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[Visitor (112.0.*.*)]answers [Chinese ]Time :2022-06-04
Atoms are the smallest particles in a chemical change. (It can also be decomposed in physical changes, decomposing into ions.) Note: It can no longer be decomposed in chemical changes) An atom contains a dense nucleus and a number of negatively charged electrons around the nucleus. The nucleus consists of positively charged protons and electrically neutral neutrons. When the number of protons is the same as the number of electrons, the atom is electrically neutral; Otherwise, it is an ion with a positive or negative charge. Depending on the number of protons and neutrons, the type of atom is also different: the number of protons determines which element the atom belongs to, while the number of neutrons determines which isotope the atom is of.
[Visitor (112.0.*.*)]answers [Chinese ]Time :2022-06-04
What is nuclear fuel?
Nuclear fuel, materials that can produce practical nuclear energy through nuclear fission or fusion in nuclear reactors. The fission of heavy nuclei and the fusion of light nuclei are the two main ways to obtain practical uranium rod nuclear energy. Uranium-235, uranium-238 and plutonium-239 are nuclear fuels capable of nuclear fission, also known as fission nuclear fuel. Among them, uranium-235 exists in nature, while uranium-233 and plutonium-239 are artificial nuclides formed by thorium-232 and uranium-238 after absorbing neutrons. Broadly speaking, thorium-232 and uranium-238 are also nuclear fuels. Deuterium and tritium are nuclear fuels that can undergo nuclear fusion, also known as fusion nuclear fuel. Deuterium exists in nature and tritium is an artificial nuclide formed after lithium 6 absorbs neutrons. The energy produced when nuclear fuel is "burned" in a nuclear reactor is much greater than that of fossil fuels, and the energy produced when 1 kilogram of uranium-235 is completely fissioned is equivalent to about 2500 tons of coal...
Nuclear reactor feedstock
Nuclear reactors that have been built in large quantities use fissioned nuclear fuels uranium-235 and plutonium-239, and rarely use uranium-233.Since no reactors using fusion nuclear fuel have been built so far, fissioned nuclear fuel is usually referred to when talking about nuclear fuel. In order to recycle and reuse, post-processing is necessary. Nuclear fuel reprocessing is a complex chemical separation and purification process, and various aqueous and dry processes have been studied. Prex Process. The biggest difference between the nuclear fuel reprocessing process and the general hydrometallurgical process is that it is highly radioactive and there is a danger of nuclear criticality.Therefore, the equipment must be placed in the equipment chamber with a thick heavy concrete protective wall and operated at a distance and measures to prevent nuclear criticality must be taken. All kinds of radioactive waste generated should be strictly managed and properly disposed of to ensure environmental safety. The implementation of nuclear fuel reprocessing can make more full and rational use of existing uranium resources...
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