2025年1月25日 · uranium-235 (U-235), radioactive isotope of the element uranium with a nucleus containing 92 protons and 143 neutrons. Uranium-235 is the only naturally occurring fissile material; that is, the uranium-235 nucleus undergoes nuclear fission when it collides with a slow neutron (a neutron with a kinetic energy less than 1 electron volt).

2024年4月17日 · Uranium (U-235 and U-238) is a heavy metal that is naturally occurring in the environment. It can be found in almost all rock, soil, and water. Ingesting or inhaling large concentrations of uranium can cause severe health effects.

The following table shows the atomic nuclei that are isotonic (same neutron number N = 143) and isobaric (same nucleon number A = 235) with Uranium-235. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Most of the inhaled or ingested U-235 leaves the body excepting a small part which stays accumulated in kidney or bones undergoing decay. It increases the risk of liver damage and cancer. Uranium-235 can be used as a rich source of energy.

2020年12月2日 · The nuclear fuel used in a nuclear reactor needs to have a higher concentration of the U 235 isotope than that which exists in natural uranium ore. U 235 when concentrated (or "enriched") is fissionable in light-water reactors (the most common reactor design in the USA).

2024年3月7日 · Uranium-235 (U-235) is ideal for nuclear power because it can undergo induced fission, where its nucleus splits after absorbing a neutron, releasing a significant amount of energy (about 200 MeV) and generating more neutrons to continue the process.

2023年8月16日 · U-238 is the most common one, accounting for around 99 per cent of natural uranium found on earth. Most nuclear reactors use fuels containing U-235, however, natural uranium typically contains only 0.72 per cent of U-235 and, most reactors need a higher concentration of this isotope in their fuel.

U-235 Th-231 (1 d) Pa-231 (32,800 a) Th-231, the immediate decay product of U-235 has a one day half life. As such, it will be in secular equilibrium with U-235 within a week. Nevertheless, the ingrowth of the U-235 daughters is relatively unimportant because: Purified Uranium - Daughter Products • There is much less U-235 than U-238.

2017年9月12日 · U-235 and U-238 are two radioactive isotopes of Uranium. The main difference between U-235 and U-238 is that the number of neutrons present in the U-235 nucleus is 143 whereas the number of protons present in the U-238 nucleus is 146.

2009年5月28日 · Uranium-235 | U | CID 61784 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.