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Protactinium also has two nuclear isomers, 217m Pa (half-life 1.2 milliseconds) and 234m Pa (half-life 1.16 minutes). [ 34 ] The primary decay mode for the most stable isotope 231 Pa and lighter ( 211 Pa to 231 Pa) is alpha decay , producing isotopes of actinium .
Protactinium-231 is the longest-lived isotope of protactinium, with a half-life of 32,760 years. In nature, it is found in trace amounts as part of the actinium series , which starts with the primordial isotope uranium-235 ; the equilibrium concentration in uranium ore is 46.55 231 Pa per million 235 U.
Beta emission: the decay energy is 0.48 MeV and the decay product is plutonium-236. This usually decays (half-life 2.8 years) to uranium-232, which usually decays (half-life 69 years) to thorium-228, which decays in a few years to lead-208. Alpha emission: the decay energy is 5.007 MeV and the decay product is protactinium-232. This decays with ...
5f 2 6d 1 7s 2: Electrons per shell: 2, 8, 18, 32, 20, 9, 2 ... Spectral lines of protactinium: Other properties; Natural occurrence: ... Decay; abundance half-life ...
Protactinium oxides are known for the metal oxidation states +2, +4 and +5. The most stable is white pentoxide Pa 2 O 5, which can be produced by igniting protactinium(V) hydroxide in air at a temperature of 500 °C. [10]
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 ...
They planned to separate and store protactinium-233, so it could decay to uranium-233 without being destroyed by neutron capture in the reactor. With a half-life of 27 days, 2 months of storage would assure that 75% of the 233 Pa decays to 233 U fuel. The protactinium removal step is not required per se for a LFTR.
Thorium-233 decays into protactinium-233 through beta decay. Protactinium-233 has a half-life of 27 days and beta decays into uranium-233; some proposed molten salt reactor designs attempt to physically isolate the protactinium from further neutron capture before beta decay can occur, to maintain the neutron economy (if it misses the 233 U ...