Difference between revisions of "Decay chain"
Physchim62 (talk | contribs) |
Physchim62 (talk | contribs) |
||
| Line 2: | Line 2: | ||
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.<ref>{{GoldBookRef|title=decay chain|file=D01537|accessdate=2011-04-18}}.</ref> 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.<ref>{{GoldBookRef|title=decay chain|file=D01537|accessdate=2011-04-18}}.</ref> 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. | ||
| − | The principle of a decay chain comes from the [[radioactive displacement law]], deduced in 1913 by [[Kazimierz Fajans|Fajans]], [[Frederick Soddy|Soddy]] and [[Alexander Russell|Russell]].<ref>{{citation | first = Alexander S. | last = Russell | authorlink = Alexander Russell | title = The periodic system and the radio-elements | journal = Chem. News | year = 1913 | volume = 107 | pages = 49–52}}.</ref> The original version of the law, which describes the most common forms of radioactive decay, is that | + | The principle of a decay chain comes from the [[radioactive displacement law]], deduced in 1913 by [[Kazimierz Fajans|Fajans]],<ref>{{citation | first = Kasimir | last = Fajans | authorlink = Kazimierz Fajans | title = Die radioaktiven Umwandlungen und das periodische System der Elemente | journal = Ber. Dtsch. Chem. Ges. | year = 1913 | volume = 46 | pages = 422–39 | doi = 10.1002/cber.19130460162}}. [http://www.chemteam.info/Chem-History/Fajans-Isotope.html Translated excerpt]</ref><ref>{{citation | first = K. | last = Fajans | authorlink = Kazimierz Fajans | journal = Phys. Z. | year = 1913 | volume = 14 | pages = 131–36}}. {{citation | first = K. | last = Fajans | authorlink = Kazimierz Fajans | journal = Phys. Z. | year = 1913 | volume = 14 | pages = 136–42}}. {{citation | first = K. | last = Fajans | authorlink = Kazimierz Fajans | journal = Radium | year = 1913 | volume = 10 | pages = 61}}.</ref> [[Frederick Soddy|Soddy]]<ref>{{citation | first = Frederick | last = Soddy | authorlink = Frederick Soddy | title = The Radio-elements and the Periodic Law | journal = Chem. News | year = 1913 | volume = 107 | pages = 97–99}}.</ref><ref>{{citation | first = Frederick | last = Soddy | authorlink = Frederick Soddy | title = Radioactivity | journal = Annu. Rep. Prog. Chem. | year = 1913 | volume = 10 | pages = 262–88 | doi = 10.1039/AR9131000262}}.</ref> and [[Alexander Russell|Russell]].<ref>{{citation | first = Alexander S. | last = Russell | authorlink = Alexander Russell | title = The periodic system and the radio-elements | journal = Chem. News | year = 1913 | volume = 107 | pages = 49–52}}.</ref> The original version of the law, which describes the most common forms of radioactive decay, is that |
*[[alpha decay]] leads to a nuclide with an [[atomic number]] two lower than the decaying nuclide, and a [[mass number]] four lower; | *[[alpha decay]] leads to a nuclide with an [[atomic number]] two lower than the decaying nuclide, and a [[mass number]] four lower; | ||
*[[beta decay]]<ref group="note">This description applies to β<sup>−</sup> decay, which was the only type of [[beta decay]] known in 1913.</ref> leads to a nuclide with the same mass number as the decaying nuclide but with an atomic number one higher. | *[[beta decay]]<ref group="note">This description applies to β<sup>−</sup> decay, which was the only type of [[beta decay]] known in 1913.</ref> leads to a nuclide with the same mass number as the decaying nuclide but with an atomic number one higher. | ||
Revision as of 04:35, 18 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.[1] 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.
The principle of a decay chain comes from the radioactive displacement law, deduced in 1913 by Fajans,[2][3] Soddy[4][5] and Russell.[6] The original version of the law, which describes the most common forms of radioactive decay, is that
- alpha decay leads to a nuclide with an atomic number two lower than the decaying nuclide, and a mass number four lower;
- beta decay[note 1] leads to a nuclide with the same mass number as the decaying nuclide but with an atomic number one higher.
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
- ↑ This description applies to β− decay, which was the only type of beta decay known in 1913.
References
- ↑ decay chain, <http://goldbook.iupac.org/D01537.html> (accessed 18 April 2011), Compendium of Chemical Terminology Internet edition; International Union of Pure and Applied Chemistry (IUPAC).
- ↑ Fajans, Kasimir Die radioaktiven Umwandlungen und das periodische System der Elemente. Ber. Dtsch. Chem. Ges. 1913, 46, 422–39. DOI: 10.1002/cber.19130460162. Translated excerpt
- ↑ Fajans, K. Phys. Z. 1913, 14, 131–36. Fajans, K. Phys. Z. 1913, 14, 136–42. Fajans, K. Radium 1913, 10, 61.
- ↑ Soddy, Frederick The Radio-elements and the Periodic Law. Chem. News 1913, 107, 97–99.
- ↑ Soddy, Frederick Radioactivity. Annu. Rep. Prog. Chem. 1913, 10, 262–88. DOI: 10.1039/AR9131000262.
- ↑ Russell, Alexander S. The periodic system and the radio-elements. Chem. News 1913, 107, 49–52.
External links
 |
See also the corresponding article on Wikipedia. |
| Error creating thumbnail: Unable to save thumbnail to destination |
This page is currently licensed under the Creative Commons Attribution 3.0 Unported license and any later versions of that license. |
