Uranium-238 (238 U or U-238) is the most common isotope of uranium found in nature, with a relative abundance of 99%. Unlike uranium-235, it is non-fissile, which means it cannot sustain a chain reaction in a thermal-neutron reactor.

U-235 and U-238 occur naturally in nearly all rock, soil, and water. U-238 is the most abundant form in the environment. U-235 can be concentrated in a process called “enrichment,” making it suitable for use in nuclear reactors or weapons.

Uranium-238 (Uranium I) is the radioisotope of the element Uranium, whose atomic nucleus has 146 neutrons in addition to the element-specific 92 protons, resulting in a mass number of 238. See also: list of Uranium isotopes. General data

Uranium-238 (238 U or U-238) is the most common isotope of uranium in nature. It is not fissile, but is fertile: it can capture a slow neutron and after two beta decays become fissile plutonium-239.

U-238 Th-234 (24.1 d) Pa-234m (1.17m) When considering ingrowth of the daughters of purified natural uranium, Th-234 and Pa-234m are the most significant. • They achieve secular equilibrium with U-238 in Purified Uranium - Daughter Products approximately six months. • They are beta-gamma emitters

Uranium 238, which alone constitutes 99.28% of natural uranium, is the most common isotope of uranium in nature. Uranium 238 has the longest half-life (4.47×10 9 years), and therefore its abundance is so high. Uranium 238 is a fissionable isotope but is not a fissile isotope.

Sep 12, 2017 · 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.

Sep 3, 2024 · 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.

Uranium-238 is the main radioactive isotope of natural Uranium. It produces many other useful radioactive elements while undergoing decay. This makes this radioactive metal quite useful and valuable.

Dec 2, 2020 · The U 238 atoms contain 146 neutrons, the U 235 atoms contain 143 neutrons, and the U 234 atoms contain only 142 neutrons. The total number of protons plus neutrons gives the atomic mass of each isotope — that is 238, 235, or 234, respectively.