Isotopes of radium

Isotopes of radium: Radium (Ra) has no stable isotopes. A standard atomic mass cannot be given. The longest lived, and most common, isotope of radium is ²²⁶Ra with a half-life of 1600 years. ²²⁶Ra occurs in the disintegration chain of ²³⁸U (often referred to as the radium series.)

Table

nuclide
symbol historic
name Z(p) N(n)
isotopic mass (u)
half-life decay
mode(s)^[1]^{[n 1]} daughter
isotope(s)^{[n 2]} nuclear
spin representative
isotopic
composition
(mole fraction) range of natural
variation
(mole fraction)

excitation energy

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-)

β⁺ (rare) ²⁰³Fr

^203mRa 220(90) keV 41(17) ms α ¹⁹⁹Rn (13/2+)

β⁺ (rare) ²⁰³Fr

²⁰⁴Ra 88 116 204.006500(17) 60(11) ms
[59(+12-9) ms] α (99.7%) ²⁰⁰Rn 0+

β⁺ (.3%) ²⁰⁴Fr

²⁰⁵Ra 88 117 205.00627(9) 220(40) ms
[210(+60-40) ms] α ²⁰¹Rn (3/2-)

β⁺ (rare) ²⁰⁵Fr

^205mRa 310(110)# keV 180(50) ms
[170(+60-40) ms] α ²⁰¹Rn (13/2+)

IT (rare) ²⁰⁵Ra

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-)

β⁺ (10%) ²⁰⁷Fr

^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+

β⁺ (5%) ²⁰⁸Fr

^208mRa 1800(200) keV 270 ns (8+)

²⁰⁹Ra 88 121 209.00199(5) 4.6(2) s α (90%) ²⁰⁵Rn 5/2-

β⁺ (10%) ²⁰⁹Fr

²¹⁰Ra 88 122 210.000495(16) 3.7(2) s α (96%) ²⁰⁶Rn 0+

β⁺ (4%) ²¹⁰Fr

^210mRa 1800(200) keV 2.24 µs (8+)

²¹¹Ra 88 123 211.000898(28) 13(2) s α (97%) ²⁰⁷Rn 5/2(-)

β⁺ (3%) ²¹¹Fr

²¹²Ra 88 124 211.999794(12) 13.0(2) s α (85%) ²⁰⁸Rn 0+

β⁺ (15%) ²¹²Fr

^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-

β⁺ (20%) ²¹³Fr

^213mRa 1769(6) keV 2.1(1) ms IT (99%) ²¹³Ra 17/2-#

α (1%) ²⁰⁹Rn

²¹⁴Ra 88 126 214.000108(10) 2.46(3) s α (99.94%) ²¹⁰Rn 0+

β⁺ (.06%) ²¹⁴Fr

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+

EC (1×10⁻⁸%) ²¹⁶Fr

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+

β⁺β⁺ (rare) ²¹⁸Rn

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+

CD (1.2×10⁻¹⁰%) ²⁰⁷Pb
¹⁴C

²²²Ra 88 134 222.015375(5) 38.0(5) s α ²¹⁸Rn 0+

CD (3×10⁻⁸%) ²⁰⁸Pb
¹⁴C

²²³Ra Actinium X 88 135 223.0185022(27) 11.43(5) d α ²¹⁹Rn 3/2+ Trace^{[n 3]}

CD (6.4×10⁻⁸%) ²⁰⁹Pb
¹⁴C

²²⁴Ra Thorium X 88 136 224.0202118(24) 3.6319(23) d α ²²⁰Rn 0+ Trace^{[n 4]}

CD (4.3×10⁻⁹%) ²¹⁰Pb
¹⁴C

²²⁵Ra 88 137 225.023612(3) 14.9(2) d β^- ²²⁵Ac 1/2+

²²⁶Ra Radium^{[n 5]} 88 138 226.0254098(25) 1600(7) y α ²²²Rn 0+ Trace^{[n 6]}

β^-β^- (rare) ²²⁶Th

CD (2.6×10⁻⁹%) ²¹²Pb
¹⁴C

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 4]}

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+

^ Abbreviations:
CD: Cluster decay
EC: Electron capture
IT: Isomeric transition

^ Bold for stable isotopes

^ Intermediate decay product of ²³⁵U

^ ^a ^b Intermediate decay product of ²³²Th

^ Source of element's name

^ Intermediate decay product of ²³⁸U

Notes

Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.

Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

^ http://www.nucleonica.net/unc.aspx

Isotope masses from:

G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties". Nuclear Physics A 729: 3–128. Bibcode 2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf.

Isotopic compositions and standard atomic masses from:

J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry 75 (6): 683–800. doi:10.1351/pac200375060683. http://www.iupac.org/publications/pac/75/6/0683/pdf/.

M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051. http://iupac.org/publications/pac/78/11/2051/pdf/. Lay summary.

Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.

G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties". Nuclear Physics A 729: 3–128. Bibcode 2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. http://www.nndc.bnl.gov/amdc/nubase/Nubase2003.pdf.

National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. http://www.nndc.bnl.gov/nudat2/. Retrieved September 2005.

N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0849304859.

Isotopes of francium Isotopes of radium Isotopes of actinium

Index to isotope pages · Table of nuclides

Categories:
Radium
Isotopes of radium
Lists of isotopes by element

nuclide symbol	historic name	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)^[1]^{[n 1]}	daughter isotope(s)^{[n 2]}	nuclear spin	representative isotopic composition (mole fraction)
excitation energy
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-)
β⁺ (rare)	²⁰³Fr
^203mRa		220(90) keV	41(17) ms	α	¹⁹⁹Rn	(13/2+)
β⁺ (rare)	²⁰³Fr
²⁰⁴Ra		88	116	204.006500(17)	60(11) ms [59(+12-9) ms]	α (99.7%)	²⁰⁰Rn	0+
β⁺ (.3%)	²⁰⁴Fr
²⁰⁵Ra		88	117	205.00627(9)	220(40) ms [210(+60-40) ms]	α	²⁰¹Rn	(3/2-)
β⁺ (rare)	²⁰⁵Fr
^205mRa		310(110)# keV	180(50) ms [170(+60-40) ms]	α	²⁰¹Rn	(13/2+)
IT (rare)	²⁰⁵Ra
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-)
β⁺ (10%)	²⁰⁷Fr
^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+
β⁺ (5%)	²⁰⁸Fr
^208mRa		1800(200) keV	270 ns			(8+)
²⁰⁹Ra		88	121	209.00199(5)	4.6(2) s	α (90%)	²⁰⁵Rn	5/2-
β⁺ (10%)	²⁰⁹Fr
²¹⁰Ra		88	122	210.000495(16)	3.7(2) s	α (96%)	²⁰⁶Rn	0+
β⁺ (4%)	²¹⁰Fr
^210mRa		1800(200) keV	2.24 µs			(8+)
²¹¹Ra		88	123	211.000898(28)	13(2) s	α (97%)	²⁰⁷Rn	5/2(-)
β⁺ (3%)	²¹¹Fr
²¹²Ra		88	124	211.999794(12)	13.0(2) s	α (85%)	²⁰⁸Rn	0+
β⁺ (15%)	²¹²Fr
^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-
β⁺ (20%)	²¹³Fr
^213mRa		1769(6) keV	2.1(1) ms	IT (99%)	²¹³Ra	17/2-#
α (1%)	²⁰⁹Rn
²¹⁴Ra		88	126	214.000108(10)	2.46(3) s	α (99.94%)	²¹⁰Rn	0+
β⁺ (.06%)	²¹⁴Fr
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+
EC (1×10⁻⁸%)	²¹⁶Fr
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+
β⁺β⁺ (rare)	²¹⁸Rn
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+
CD (1.2×10⁻¹⁰%)	²⁰⁷Pb ¹⁴C
²²²Ra		88	134	222.015375(5)	38.0(5) s	α	²¹⁸Rn	0+
CD (3×10⁻⁸%)	²⁰⁸Pb ¹⁴C
²²³Ra	Actinium X	88	135	223.0185022(27)	11.43(5) d	α	²¹⁹Rn	3/2+	Trace^{[n 3]}
CD (6.4×10⁻⁸%)	²⁰⁹Pb ¹⁴C
²²⁴Ra	Thorium X	88	136	224.0202118(24)	3.6319(23) d	α	²²⁰Rn	0+	Trace^{[n 4]}
CD (4.3×10⁻⁹%)	²¹⁰Pb ¹⁴C
²²⁵Ra		88	137	225.023612(3)	14.9(2) d	β^-	²²⁵Ac	1/2+
²²⁶Ra	Radium^{[n 5]}	88	138	226.0254098(25)	1600(7) y	α	²²²Rn	0+	Trace^{[n 6]}
β^-β^- (rare)	²²⁶Th
CD (2.6×10⁻⁹%)	²¹²Pb ¹⁴C
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 4]}
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+

Isotopes of francium	Isotopes of radium	Isotopes of actinium
Index to isotope pages · Table of nuclides

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