Difference between revisions of "Decay chain"
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A '''decay chain''', also called a '''radioactive series''', is a sequence of [[nuclide]]s in which each nuclide transforms into the next by [[radioactive decay]] until a stable nuclide is reached. There are three "classical" decay chains, which describe the decay of the naturally-occuring [[actinoid]]s; a fourth long decay chain has become extinct in natural sources, but is known from artificially-produced radionuclides. Shorter decay chains describe the decay of the [[transfermium element]]s and lighter non-actinoid radionuclides. | A '''decay chain''', also called a '''radioactive series''', is a sequence of [[nuclide]]s in which each nuclide transforms into the next by [[radioactive decay]] until a stable nuclide is reached. There are three "classical" decay chains, which describe the decay of the naturally-occuring [[actinoid]]s; a fourth long decay chain has become extinct in natural sources, but is known from artificially-produced radionuclides. Shorter decay chains describe the decay of the [[transfermium element]]s and lighter non-actinoid radionuclides. | ||
| + | |||
| + | ==Actinoid decay chains== | ||
| + | ===Actinium (4''n''+3) series=== | ||
| + | {| class="wikitable" style="text-align:center;" | ||
| + | |- | ||
| + | | colspan=2 | [[Uranium-235]]<br/>(α, 7.04{{e|8}} a) | ||
| + | |- | ||
| + | | colspan=2 | [[Thorium-231]]<br/>(β<sup>−</sup>, 25.52 h) | ||
| + | |- | ||
| + | | colspan=2 | [[Protactinium-231]]<br/>(α, 3.276{{e|4}} a) | ||
| + | |- | ||
| + | | colspan=2 | [[Actinium-227]]<br/>(21.772 a) | ||
| + | |- | ||
| + | | α, 1.38% || β<sup>−</sup>, 98.62% | ||
| + | |- | ||
| + | | [[Francium-223]]<br/>(22.00 min) || [[Thorium-227]]<br/>(α, 18.68 d) | ||
| + | |- | ||
| + | |} | ||
==Notes and references== | ==Notes and references== | ||
Revision as of 15:49, 16 April 2011
A decay chain, also called a radioactive series, is a sequence of nuclides in which each nuclide transforms into the next by radioactive decay until a stable nuclide is reached. There are three "classical" decay chains, which describe the decay of the naturally-occuring actinoids; a fourth long decay chain has become extinct in natural sources, but is known from artificially-produced radionuclides. Shorter decay chains describe the decay of the transfermium elements and lighter non-actinoid radionuclides.
Contents
Actinoid decay chains
Actinium (4n+3) series
| Uranium-235 (α, 7.04 × 108 a) | |
| Thorium-231 (β−, 25.52 h) | |
| Protactinium-231 (α, 3.276 × 104 a) | |
| Actinium-227 (21.772 a) | |
| α, 1.38% | β−, 98.62% |
| Francium-223 (22.00 min) |
Thorium-227 (α, 18.68 d) |
Notes and references
Notes
References
External links
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See also the corresponding article on Wikipedia. |
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