鐳的同位素

鐳没有稳定的同位素，故无法给出它们的标准原子量。

圖表

符號	歷史名稱	Z（p ）	N（n ）	同位素質量（u）	半衰期[n 1]	衰變方式[1][n 2]	衰變產物[n 3]	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[n 1]	衰變方式[1][n 2]	衰變產物[n 3]	原子核自旋	相對豐度（莫耳分率）	相對豐度（莫耳分率）
²⁰²Ra		88	114	202.00989(7)	2.6(21) ms [0.7(+33−3) ms]			0+
²⁰³Ra		88	115	203.00927(9)	4(3) ms	α	¹⁹⁹Rn	(3/2−)
²⁰³Ra		88	115	203.00927(9)	4(3) ms	β⁺ （不常見）	²⁰³Fr	(3/2−)
^203mRa		220(90) keV			41(17) ms	α	¹⁹⁹Rn	(13/2+)
^203mRa		220(90) keV			41(17) ms	β⁺ （不常見）	²⁰³Fr	(13/2+)
²⁰⁴Ra		88	116	204.006500(17)	60(11) ms [59(+12−9) ms]	α (99.7%)	²⁰⁰Rn	0+
²⁰⁴Ra		88	116	204.006500(17)	60(11) ms [59(+12−9) ms]	β⁺ (.3%)	²⁰⁴Fr	0+
²⁰⁵Ra		88	117	205.00627(9)	220(40) ms [210(+60−40) ms]	α	²⁰¹Rn	(3/2−)
²⁰⁵Ra		88	117	205.00627(9)	220(40) ms [210(+60−40) ms]	β⁺ （不常見）	²⁰⁵Fr	(3/2−)
^205mRa		310(110)# keV			180(50) ms [170(+60−40) ms]	α	²⁰¹Rn	(13/2+)
^205mRa		310(110)# keV			180(50) ms [170(+60−40) ms]	IT （不常見）	²⁰⁵Ra	(13/2+)
²⁰⁶Ra		88	118	206.003827(19)	0.24(2) s	α	²⁰²Rn	0+
²⁰⁷Ra		88	119	207.00380(6)	1.3(2) s	α (90%)	²⁰³Rn	(5/2−,3/2−)
²⁰⁷Ra		88	119	207.00380(6)	1.3(2) s	β⁺ (10%)	²⁰⁷Fr	(5/2−,3/2−)
^207mRa		560(50) keV			57(8) ms	IT (85%)	²⁰⁷Ra	(13/2+)
						α (15%)	²⁰³Rn
						β⁺ (.55%)	²⁰⁷Fr
²⁰⁸Ra		88	120	208.001840(17)	1.3(2) s	α (95%)	²⁰⁴Rn	0+
²⁰⁸Ra		88	120	208.001840(17)	1.3(2) s	β⁺ (5%)	²⁰⁸Fr	0+
^208mRa		1800(200) keV			270 ns			(8+)
²⁰⁹Ra		88	121	209.00199(5)	4.6(2) s	α (90%)	²⁰⁵Rn	5/2−
²⁰⁹Ra		88	121	209.00199(5)	4.6(2) s	β⁺ (10%)	²⁰⁹Fr	5/2−
²¹⁰Ra		88	122	210.000495(16)	3.7(2) s	α (96%)	²⁰⁶Rn	0+
²¹⁰Ra		88	122	210.000495(16)	3.7(2) s	β⁺ (4%)	²¹⁰Fr	0+
^210mRa		1800(200) keV			2.24 µs			(8+)
²¹¹Ra		88	123	211.000898(28)	13(2) s	α (97%)	²⁰⁷Rn	5/2(−)
²¹¹Ra		88	123	211.000898(28)	13(2) s	β⁺ (3%)	²¹¹Fr	5/2(−)
²¹²Ra		88	124	211.999794(12)	13.0(2) s	α (85%)	²⁰⁸Rn	0+
²¹²Ra		88	124	211.999794(12)	13.0(2) s	β⁺ (15%)	²¹²Fr	0+
^212m1Ra		1958.4(5) keV			10.9(4) µs			(8)+
^212m2Ra		2613.4(5) keV			0.85(13) µs			(11)−
²¹³Ra		88	125	213.000384(22)	2.74(6) min	α (80%)	²⁰⁹Rn	1/2−
²¹³Ra		88	125	213.000384(22)	2.74(6) min	β⁺ (20%)	²¹³Fr	1/2−
^213mRa		1769(6) keV			2.1(1) ms	IT (99%)	²¹³Ra	17/2−#
^213mRa		1769(6) keV			2.1(1) ms	α (1%)	²⁰⁹Rn	17/2−#
²¹⁴Ra		88	126	214.000108(10)	2.46(3) s	α (99.94%)	²¹⁰Rn	0+
²¹⁴Ra		88	126	214.000108(10)	2.46(3) s	β⁺ (.06%)	²¹⁴Fr	0+
²¹⁵Ra		88	127	215.002720(8)	1.55(7) ms	α	²¹¹Rn	(9/2+)#
^215m1Ra		1877.8(5) keV			7.1(2) µs			(25/2+)
^215m2Ra		2246.9(5) keV			1.39(7) µs			(29/2−)
^215m3Ra		3756.6(6)+X keV			0.555(10) µs			(43/2−)
²¹⁶Ra		88	128	216.003533(9)	182(10) ns	α	²¹²Rn	0+
²¹⁶Ra		88	128	216.003533(9)	182(10) ns	ε (1×10⁻⁸%)	²¹⁶Fr	0+
²¹⁷Ra		88	129	217.006320(9)	1.63(17) µs	α	²¹³Rn	(9/2+)
²¹⁸Ra		88	130	218.007140(12)	25.2(3) µs	α	²¹⁴Rn	0+
²¹⁸Ra		88	130	218.007140(12)	25.2(3) µs	β⁺β⁺ （不常見）	²¹⁸Rn	0+
²¹⁹Ra		88	131	219.010085(9)	10(3) ms	α	²¹⁵Rn	(7/2)+
²²⁰Ra		88	132	220.011028(10)	17.9(14) ms	α	²¹⁶Rn	0+
²²¹Ra		88	133	221.013917(5)	28(2) s	α	²¹⁷Rn	5/2+
²²¹Ra		88	133	221.013917(5)	28(2) s	CD (1.2×10⁻¹⁰%)	207 Pb 14 C	5/2+
²²²Ra		88	134	222.015375(5)	38.0(5) s	α	²¹⁸Rn	0+	Trace[n 4]
²²²Ra		88	134	222.015375(5)	38.0(5) s	CD (3×10⁻⁸%)	208 Pb 14 C	0+	Trace[n 4]
²²³Ra[n 5]	Actinium X	88	135	223.0185022(27)	11.43(5) d	α	²¹⁹Rn	3/2+	Trace[n 6]
²²³Ra[n 5]	Actinium X	88	135	223.0185022(27)	11.43(5) d	CD (6.4×10⁻⁸%)	209 Pb 14 C	3/2+	Trace[n 6]
²²⁴Ra	Thorium X	88	136	224.0202118(24)	3.6319(23) d	α	²²⁰Rn	0+	Trace[n 7]
²²⁴Ra	Thorium X	88	136	224.0202118(24)	3.6319(23) d	CD (4.3×10⁻⁹%)	210 Pb 14 C	0+	Trace[n 7]
²²⁵Ra		88	137	225.023612(3)	14.9(2) d	β⁻	²²⁵Ac	1/2+
²²⁶Ra	Radium[n 8]	88	138	226.0254098(25)	1600(7) y	α	²²²Rn	0+	[n 9]
						β⁻β⁻ （不常見）	²²⁶Th
						CD (2.6×10⁻⁹%)	212 Pb 14 C
²²⁷Ra		88	139	227.0291778(25)	42.2(5) min	β⁻	²²⁷Ac	3/2+
²²⁸Ra	Mesothorium 1	88	140	228.0310703(26)	5.75(3) y	β⁻	²²⁸Ac	0+	Trace[n 7]
²²⁹Ra		88	141	229.034958(20)	4.0(2) min	β⁻	²²⁹Ac	5/2(+)
²³⁰Ra		88	142	230.037056(13)	93(2) min	β⁻	²³⁰Ac	0+
²³¹Ra		88	143	231.04122(32)#	103(3) s	β⁻	²³¹Ac	(5/2+)
^231mRa		66.21(9) keV			~53 µs			(1/2+)
²³²Ra		88	144	232.04364(30)#	250(50) s	β⁻	²³²Ac	0+
²³³Ra		88	145	233.04806(50)#	30(5) s	β⁻	²³³Ac	1/2+#
²³⁴Ra		88	146	234.05070(53)#	30(10) s	β⁻	²³⁴Ac	0+

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	→
鈁的同位素	鐳的同位素	錒的同位素

註釋

Bold for isotopes with half-lives longer than the age of the universe (nearly stable)
Abbreviations:
CD: Cluster decay
EC: Electron capture
IT: Isomeric transition
Bold for stable isotopes
Intermediate decay product of ²³⁸U
Used for treating bone cancer
Intermediate decay product of ²³⁵U
Intermediate decay product of ²³²Th
Source of element's name
Intermediate decay product of ²³⁸U

参考文獻

. nucleonica. .

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.

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[1] Bold for isotopes with half-lives longer than the age of the universe (nearly stable)

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

[4] Bold for stable isotopes

[5] Intermediate decay product of ²³⁸U

[6] Used for treating bone cancer

[7] Intermediate decay product of ²³⁵U

[ths-8] Intermediate decay product of ²³²Th

[9] Source of element's name

[10] Intermediate decay product of ²³⁸U

[2] . nucleonica. .