U238 or U-238 may be: German submarine U-238, a German World War II U-boat (submarine) Uranium-238 (U-238 or 238U), the most common isotope of uranium...

The Gilbert U-238 Atomic Energy Lab is a toy lab set designed to allow children to create and watch nuclear and chemical reactions using radioactive material...

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...

is U-238, while approximately 0.72% is U-235, fissile by thermal neutrons, and the remaining 0.0055% is U-234. If natural uranium is enriched to 3% U-235...

German submarine U-238 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine built for service in the Second World War. She was laid down on 21 April...

Surrounded by a U-238 reflector/tamper, the Fat Man's pit was brought close to critical mass by the neutron-reflecting properties of the U-238. During detonation...

of proliferation). Fissile U-235 and non-fissile but fissionable and fertile U-238 are both used in the fission process. U-235 is fissionable by thermal...

Initially only about 0.7% of it is fissile U-235, with the rest being almost entirely uranium-238 (U-238). They are separated by their differing masses...

uranium with U-235 levels usually above 90%, suitable for nuclear weapons. The uranium in yellowcake is almost exclusively (>99%) U-238, with very low...

at zero): 234 U / 238 U = 1 + A × 2 − t / 245000 {\displaystyle ^{234}{\text{U}}/^{238}{\text{U}}=1+A\times 2^{-t/245000}} 230 Th / 238 U = 1 + A 1 − 75000...

primarily of two isotopes U-238 and U-235, with 99.28% of the metal being U-238 while 0.71% is U-235, and the remaining 0.01% is mostly U-234. The number in...

is stable): U 238 ⟶ Th 234 ⏟ daughter   of   238 U ⟶ Pa 234 m ⏟ granddaughter   of   238 U ⟶ ⋯ ⟶ Pb 206 ⏞ decay   products   of   238 U {\displaystyle...

only moderately enriched with U-235 relative to U-238, so the U-238 continues to serve as a denaturation agent for any U-235 produced by plutonium decay...

surrounding a neutron source, such as a nuclear reactor, with a 'blanket' of U-238. The neutrons released by nuclear fission are donated, producing Pu-239...

cause subsequent fission of 238 U, so fission of 238 U does not sustain a nuclear chain reaction. Fast fission of 238 U in the secondary stage of a thermonuclear...

isotopes: uranium-238 (U-238), accounting for 99.3% and uranium-235 (U-235) accounting for about 0.7%. U-238 has 146 neutrons and U-235 has 143 neutrons...

227 Ac 227 Th, 228 Th, 229 Th, 230 Th, 232 Th 231 Pa 233 U, 234 U, 235 U, 236 U, 238 U 237 Np 238 Pu, 239 Pu, 240 Pu, 244 Pu 241 Am 244 Cm, 245 Cm, 248 Cm...

is dependent upon the alpha decay energy. A pleochroic halo formed from U-238 has theoretically eight concentric rings, with five actually distinguishable...

age of the Earth. The most common isotopes in natural uranium are uranium-238 (which has 146 neutrons and accounts for over 99% of uranium on Earth) and...

(primarily as a product of alpha decay of 238 U—because the half-life of 238 U is much larger than that of 234 U, it is produced and destroyed at the same...

Uranium-235 (235 U or U-235) is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile...

primarily of the unconsumed remains of the original fuel (typically U-235, U-238, and/or Pu-239). The fuel is first dissolved in nitric acid at a concentration...

"media overview" material and technical details: "assembly containing only U-238 (or natural uranium, or nuclear waste) and positioned near an existing nuclear...

(radioelement) with no stable isotopes. It has two primordial isotopes, uranium-238 and uranium-235, that have long half-lives and are found in appreciable quantity...

night of 19/20 several Leuthen boats were in contact; U-260 attacked, but gained no hits. U-238 fired on 2 ships, sinking one, Theodore Dwight Weld, and...

the radioactive decay products from the uranium decay chains, mainly the U-238 chain, and heavy metals. Long-term storage or disposal of tailings may pose...

generate much, or even most, of their yields from fission. Although the U-238 isotope of uranium will not sustain a chain reaction, it still fissions...

insensitive. Two variants were made: the B53-Y1, a "dirty" weapon using a U-238-encased secondary, and the B53-Y2 "clean" version with a non-fissile (lead...

The Type VII was a class of medium attack U-boats built for Nazi Germany's Kriegsmarine from 1935 to 1945. Designed for attacking the North Atlantic convoy...

of TNT (100 PJ) yield, dirty version with a tertiary stage encased with U-238 (natural uranium); and the Mk-41Y2, a 10 megatonnes of TNT (42 PJ) yield...