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The longest-lived and most abundant (nearly 100%) naturally occurring isotope of protactinium, protactinium-231, has a half-life of 32,760 years and is a decay product of uranium-235. Much smaller trace amounts of the short-lived protactinium-234 and its nuclear isomer protactinium-234m occur in the decay chain of uranium-238 .
The former occurs as an intermediate decay product of 235 U, while the latter two occur as intermediate decay products of 238 U. 231 Pa makes up nearly all natural protactinium. The primary decay mode for isotopes of Pa lighter than (and including) the most stable isotope 231 Pa is alpha decay , except for 228 Pa to 230 Pa, which primarily ...
Another channel involves neutron capture reaction on small amounts of thorium-230, which is a tiny fraction of natural thorium present due to the decay of uranium-238: 230 Th (n,γ) → 231 Th (β −) → 231 Pa (n,γ) → 232 Pa (β −) → 232 U. The decay chain of 232 U quickly yields strong gamma radiation emitters. Thallium-208 is the ...
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The actinide series is a group of chemical elements with atomic numbers ranging from 89 to 102, [note 1] including notable elements such as uranium and plutonium.The nuclides (or isotopes) thorium-232, uranium-235, and uranium-238 occur primordially, while trace quantities of actinium, protactinium, neptunium, and plutonium exist as a result of radioactive decay and (in the case of neptunium ...
In the thorium cycle, thorium-232 breeds by converting first to protactinium-233, which then decays to uranium-233. If the protactinium remains in the reactor, small amounts of uranium-232 are also produced, which has the strong gamma emitter thallium-208 in its decay chain. Similar to uranium-fueled designs, the longer the fuel and fertile ...
Related: Cancer-Causing 'Forever Chemicals' Found in Many Kinds of Contact Lenses, Study Finds The issue, the statement says, comes from a synthetic polymer called fluoroelastomer, which is used ...
Protactinium nitride is a binary inorganic compound of protactinium and nitrogen with the chemical formula PaN. [1] [2] [3] Synthesis. The compound can be obtained ...