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Actinides and fission products by half-life v t e
Actinides^[1] by decay chain				Half-life range (a)	Fission products of ²³⁵U by yield^[2]
4n	4n+1	4n+2	4n+3		Fission products of ²³⁵U by yield^[2]
4n	4n+1	4n+2	4n+3			4.5–7%	0.04–1.25%	<0.001%
²²⁸Ra^№				4–6	†		¹⁵⁵Eu^þ
²⁴⁴Cm	²⁴¹Pu^ƒ	²⁵⁰Cf	²²⁷Ac^№	10–29		⁹⁰Sr	⁸⁵Kr	^113mCd^þ
²³²U^ƒ		²³⁸Pu	²⁴³Cm^ƒ	29–97		¹³⁷Cs	¹⁵¹Sm^þ	^121mSn
²⁴⁸Bk^[3]	²⁴⁹Cf^ƒ	^242mAm^ƒ		141–351	No fission products have a half-life in the range of 100–210k years…
	²⁴¹Am		²⁵¹Cf^ƒ^[4]	430–900
		²²⁶Ra^№	²⁴⁷Bk	1.3k–1.6k
²⁴⁰Pu	²²⁹Th	²⁴⁶Cm	²⁴³Am	4.7k–7.4k
	²⁴⁵Cm^ƒ	²⁵⁰Cm		8.3k–8.5k
			²³⁹Pu^ƒ	24.1k
		²³⁰Th^№	²³¹Pa^№	32k–76k
²³⁶Np^ƒ	²³³U^ƒ	²³⁴U^№		150k–250k	‡	⁹⁹Tc^₡	¹²⁶Sn
²⁴⁸Cm		²⁴²Pu		327k–375k			⁷⁹Se^₡
				1.53M		⁹³Zr
	²³⁷Np			2.1M–6.5M		¹³⁵Cs^₡	¹⁰⁷Pd
²³⁶U			²⁴⁷Cm^ƒ	15M–24M			¹²⁹I^₡
²⁴⁴Pu^№				80M	...nor beyond 15.7M years^[5]
²³²Th^№		²³⁸U^№	²³⁵U^ƒ№	0.7G–14.1G	...nor beyond 15.7M years^[5]
Legend for superscript symbols ₡ has thermal neutron capture cross section in the range of 8–50 barns ƒ fissile m metastable isomer № naturally occurring radioactive material (NORM) þ neutron poison (thermal neutron capture cross section greater than 3k barns) † range 4a–97a: Medium-lived fission product ‡ over 200ka: Long-lived fission product

References

^ Plus radium (element 88). While actually a sub-actinide, it immediately precedes actinium (89) and follows a three element gap of instability after polonium (84) where no isotopes have half-lives of at least four years (the longest-lived isotope in the gap is radon-222 with a half life of less than four days). Radium's longest lived isotope, at 1600 years, thus merits the element's inclusion here.
^ Specifically from thermal neutron fission of U-235, e.g. in a typical nuclear reactor.
^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1016/0029-5582(65)90719-4, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1016/0029-5582(65)90719-4 instead.
"The isotopic analyses disclosed a species of mass 248 in constant abundance in three samples analysed over a period of about 10 months. This was ascribed to an isomer of Bk²⁴⁸ with a half-life greater than 9 y. No growth of Cf²⁴⁸ was detected, and a lower limit for the β⁻ half-life can be set at about 10⁴ y. No alpha activity attributable to the new isomer has been detected; the alpha half-life is probably greater than 300 y."
^ This is the heaviest isotope with a half-life of at least four years before the "Sea of Instability".
^ Excluding those "classically stable" isotopes with half-lives significantly in excess of ²³²Th, e.g. while ^113mCd has a half-life of only fourteen years, that of ¹¹³Cd is nearly eight quadrillion.

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@@ Line 137: / Line 137: @@
 ! style="text-align:center; background:#e8e8e8;" | 80M
 | colspan="4" rowspan="2" align="center" bgcolor=#ffffdd style="border-width:1px; border-style:dashed" |
-...nor beyond 15.7M<ref>Excluding those "[[Primordial nuclide|classically stable]]" isotopes with half-lives significantly in excess of <sup>232</sup>Th, e.g. while <sup>113m</sup>Cd has a half-life of only fourteen years, that of <sup>113</sup>Cd is nearly eight [[Orders of magnitude (numbers)#1015|quadrillion]].</ref>
+...nor beyond 15.7M years<ref>Excluding those "[[Primordial nuclide|classically stable]]" isotopes with half-lives significantly in excess of <sup>232</sup>Th, e.g. while <sup>113m</sup>Cd has a half-life of only fourteen years, that of <sup>113</sup>Cd is nearly eight [[Orders of magnitude (numbers)#1015|quadrillion]].</ref>
 |-
 | {{Iso1|[[Thorium-232|232]]|Th<sup>№</sup>|9}}

Template:Actinides vs fission products: Difference between revisions

Revision as of 07:01, 16 February 2015

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