錒的同位素

**主要的錒同位素**
ε	226Ra
α	222Fr
α	223Fr
←Ra（88）	Th（90）→
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錒的同位素：

圖表

符號	歷史名稱	Z（p ）	N（n ）	同位素質量（u）	半衰期	衰變方式^[1]^{[n 1]}	衰變產物^{[n 2]}	原子核自旋	相對豐度（莫耳分率）	相對豐度（莫耳分率）
符號	歷史名稱	激發能量			半衰期	衰變方式^[1]^{[n 1]}	衰變產物^{[n 2]}	原子核自旋	相對豐度（莫耳分率）	相對豐度（莫耳分率）
²⁰⁵Ac^[2]		89	116		20(+97−9) ms	α	²⁰¹Fr
²⁰⁶Ac		89	117	206.01450(8)	25(7) ms			(3+)
^206m1Ac		80(50) keV			15(6) ms
^206m2Ac		290(110)# keV			41(16) ms			(10−)
²⁰⁷Ac		89	118	207.01195(6)	31(8) ms [27(+11−6) ms]	α	²⁰³Fr	9/2−#
²⁰⁸Ac		89	119	208.01155(6)	97(16) ms [95(+24−16) ms]	α (99%)	²⁰⁴Fr	(3+)
²⁰⁸Ac		89	119	208.01155(6)	97(16) ms [95(+24−16) ms]	β⁺ (1%)	²⁰⁸Ra	(3+)
^208mAc		506(26) keV			28(7) ms [25(+9−5) ms]	α (89%)	²⁰⁴Fr	(10−)
						IT (10%)	²⁰⁸Ac
						β⁺ (1%)	²⁰⁸Ra
²⁰⁹Ac		89	120	209.00949(5)	92(11) ms	α (99%)	²⁰⁵Fr	(9/2−)
²⁰⁹Ac		89	120	209.00949(5)	92(11) ms	β⁺ (1%)	²⁰⁹Ra	(9/2−)
²¹⁰Ac		89	121	210.00944(6)	350(40) ms	α (96%)	²⁰⁶Fr	7+#
²¹⁰Ac		89	121	210.00944(6)	350(40) ms	β⁺ (4%)	²¹⁰Ra	7+#
²¹¹Ac		89	122	211.00773(8)	213(25) ms	α (99.8%)	²⁰⁷Fr	9/2−#
²¹¹Ac		89	122	211.00773(8)	213(25) ms	β⁺ (.2%)	²¹¹Ra	9/2−#
²¹²Ac		89	123	212.00781(7)	920(50) ms	α (97%)	²⁰⁸Fr	6+#
²¹²Ac		89	123	212.00781(7)	920(50) ms	β⁺ (3%)	²¹²Ra	6+#
²¹³Ac		89	124	213.00661(6)	731(17) ms	α	²⁰⁹Fr	(9/2−)#
²¹³Ac		89	124	213.00661(6)	731(17) ms	β⁺ （不常見）	²¹³Ra	(9/2−)#
²¹⁴Ac		89	125	214.006902(24)	8.2(2) s	α (89%)	²¹⁰Fr	(5+)#
²¹⁴Ac		89	125	214.006902(24)	8.2(2) s	β⁺ (11%)	²¹⁴Ra	(5+)#
²¹⁵Ac		89	126	215.006454(23)	0.17(1) s	α (99.91%)	²¹¹Fr	9/2−
²¹⁵Ac		89	126	215.006454(23)	0.17(1) s	β⁺ (.09%)	²¹⁵Ra	9/2−
²¹⁶Ac		89	127	216.008720(29)	0.440(16) ms	α	²¹²Fr	(1−)
²¹⁶Ac		89	127	216.008720(29)	0.440(16) ms	β⁺ (7×10⁻⁵%)	²¹⁶Ra	(1−)
^216mAc		44(7) keV			443(7) µs			(9−)
²¹⁷Ac		89	128	217.009347(14)	69(4) ns	α (98%)	²¹³Fr	9/2−
²¹⁷Ac		89	128	217.009347(14)	69(4) ns	β⁺ (2%)	²¹⁷Ra	9/2−
^217mAc		2012(20) keV			740(40) ns			(29/2)+
²¹⁸Ac		89	129	218.01164(5)	1.08(9) µs	α	²¹⁴Fr	(1−)#
^218mAc		584(50)# keV			103(11) ns			(11+)
²¹⁹Ac		89	130	219.01242(5)	11.8(15) µs	α	²¹⁵Fr	9/2−
²¹⁹Ac		89	130	219.01242(5)	11.8(15) µs	β⁺ (10⁻⁶%)	²¹⁹Ra	9/2−
²²⁰Ac		89	131	220.014763(16)	26.36(19) ms	α	²¹⁶Fr	(3−)
²²⁰Ac		89	131	220.014763(16)	26.36(19) ms	β⁺ (5×10⁻⁴%)	²²⁰Ra	(3−)
²²¹Ac		89	132	221.01559(5)	52(2) ms	α	²¹⁷Fr	9/2−#
²²²Ac		89	133	222.017844(6)	5.0(5) s	α (99%)	²¹⁸Fr	1−
²²²Ac		89	133	222.017844(6)	5.0(5) s	β⁺ (1%)	²²²Ra	1−
^222mAc		200(150)# keV			1.05(7) min	α (88.6%)	²¹⁸Fr	high
						IT (10%)	²²²Ac
						β⁺ (1.4%)	²²²Ra
²²³Ac		89	134	223.019137(8)	2.10(5) min	α (99%)	²¹⁹Fr	(5/2−)
						ε (1%)	²²³Ra
						CD (3.2×10⁻⁹%)	²⁰⁹Bi ¹⁴C
²²⁴Ac		89	135	224.021723(4)	2.78(17) h	β⁺ (90.9%)	²²⁴Ra	0−
						α (9.1%)	²²⁰Fr
						β⁻ (1.6%)	²²⁴Th
²²⁵Ac^{[n 3]}		89	136	225.023230(5)	10.0(1) d	α	²²¹Fr	(3/2−)
²²⁵Ac^{[n 3]}		89	136	225.023230(5)	10.0(1) d	CD (6×10⁻¹⁰%)	²¹¹Bi ¹⁴C	(3/2−)
²²⁶Ac		89	137	226.026098(4)	29.37(12) h	β⁻ (83%)	²²⁶Th	(1)(−#)
						ε (17%)	²²⁶Ra
						α (.006%)	²²²Fr
²²⁷Ac	Actinium^{[n 4]}	89	138	227.0277521(26)	21.772(3) y	β⁻ (98.61%)	²²⁷Th	3/2−	Trace^{[n 5]}
²²⁷Ac	Actinium^{[n 4]}	89	138	227.0277521(26)	21.772(3) y	α (1.38%)	²²³Fr	3/2−	Trace^{[n 5]}
²²⁸Ac	Mesothorium 2	89	139	228.0310211(27)	6.13(2) h	β⁻	²²⁸Th	3+	Trace^{[n 6]}
²²⁸Ac	Mesothorium 2	89	139	228.0310211(27)	6.13(2) h	α (5.5×10⁻⁶%)	²²⁴Fr	3+	Trace^{[n 6]}
²²⁹Ac		89	140	229.03302(4)	62.7(5) min	β⁻	²²⁹Th	(3/2+)
²³⁰Ac		89	141	230.03629(32)	122(3) s	β⁻	²³⁰Th	(1+)
²³¹Ac		89	142	231.03856(11)	7.5(1) min	β⁻	²³¹Th	(1/2+)
²³²Ac		89	143	232.04203(11)	119(5) s	β⁻	²³²Th	(1+)
²³³Ac		89	144	233.04455(32)#	145(10) s	β⁻	²³³Th	(1/2+)
²³⁴Ac		89	145	234.04842(43)#	44(7) s	β⁻	²³⁴Th
²³⁵Ac		89	146	235.05123(38)#	40# s	β⁻	²³⁵Th	1/2+#
²³⁶Ac		89	147	236.05530(54)#	2# min	β⁻	²³⁶Th

備註：畫上#號的數據代表沒有經過實驗的證明，只是理論推測而已，而用括號括起來的代表數據不確定性。

←	同位素列表	→
鐳的同位素	錒的同位素	釷的同位素

註釋

↑ Abbreviations:
CD: Cluster decay
EC: Electron capture
IT: Isomeric transition
↑ Bold italics for nearly-stable isotopes (half-life longer than the age of the universe)
↑ Has medical uses
↑ Source of element's name
↑ Intermediate decay product of ²³⁵U
↑ Intermediate decay product of ²³²Th

參考文獻

↑ Universal Nuclide Chart. nucleonica.
↑ Zhang, Z. Y.; Gan, Z. G.; Ma, L.; Yu, L.; Yang, H. B.; Huang, T. H.; Li, G. S.; Tian, Y. L.; Wang, Y. S.; Xu, X. X.; Huang, M. H.; Luo, C.; Ren, Z. Z.; Zhou, S.G.; Zhou, X. H.; Xu, H. S.; Xiao, G. Q. α decay of the new neutron-deficient isotope ²⁰⁵Ac. Physical Review C. 2014-01, 89 (1): 014308. doi:10.1103/PhysRevC.89.014308.

Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683–800, (2003) and Atomic Weights Revised (2005).
Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3–128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.

[2] Abbreviations:
CD: Cluster decay
EC: Electron capture
IT: Isomeric transition

[3] Bold italics for nearly-stable isotopes (half-life longer than the age of the universe)

[5] Has medical uses

[6] Source of element's name

[7] Intermediate decay product of ²³⁵U

[8] Intermediate decay product of ²³²Th

[1] Universal Nuclide Chart. nucleonica.

[ZhangEtAl2014-4] Zhang, Z. Y.; Gan, Z. G.; Ma, L.; Yu, L.; Yang, H. B.; Huang, T. H.; Li, G. S.; Tian, Y. L.; Wang, Y. S.; Xu, X. X.; Huang, M. H.; Luo, C.; Ren, Z. Z.; Zhou, S.G.; Zhou, X. H.; Xu, H. S.; Xiao, G. Q. α decay of the new neutron-deficient isotope ²⁰⁵Ac. Physical Review C. 2014-01, 89 (1): 014308. doi:10.1103/PhysRevC.89.014308.

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