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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 decay by electron capture to isotopes of thorium. The primary mode for the heavier isotopes is beta minus (β −) decay.
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. The primary mode for the heavier isotopes ( 232 Pa to 239 Pa) is beta decay , producing isotopes of uranium .
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protactinium-240: 2 120 plutonium-229: 2.0 120 actinium-230: 2.03 122 oxygen-15: 2.0373 122.24 bismuth-194m1: 2.08 125 actinium-223: 2.10 126 bismuth-211: 2.14 128 bismuth-216: 2.17 130 lead-191m: 2.18 131 polonium-221: 2.2 130 neptunium-242: 2.2 130 protactinium-238: 2.27 136 neptunium-244: 2.29 137 mendelevium-252: 2.30 138 astatine-221: 2.3 ...
Protactinium-239; Protactinium-240; Protactinium-241 This page was last edited on 7 October 2010, at 02:02 (UTC). Text is available under the Creative Commons ...
Uranium-232 (232 U) is an isotope of uranium.It has a half-life of around 69 years and is a side product in the thorium cycle.It has been cited as an obstacle to nuclear proliferation using 233 U as the fissile material, because the intense gamma radiation emitted by 208 Tl (a daughter of 232 U, produced relatively quickly) makes the 233 U contaminated with it more difficult to handle.
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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 ...