Isotopes of polonium#Polonium-218

There are 42 isotopes of polonium (₈₄Po). They range in size from 186 to 227 nucleons. They are all radioactive. ²¹⁰Po with a half-life of 138.376 days has the longest half-life of any naturally-occurring isotope of polonium and is the most common isotope of polonium. It is also the most easily synthesized polonium isotope. ²⁰⁹Po, which does not occur naturally, has the longest half-life of all isotopes of polonium at 124 years. ²⁰⁹Po can be made by using a cyclotron to bombard bismuth with protons, as can ²⁰⁸Po.{{Cite book| last=Carvalho|first=F.|last2=Fernandes|first2=S.|last3=Fesenko|first3=S. |last4=Holm|first4=E.|last5=Howard|first5=B.|last6=Martin|first6=P.|last7=Phaneuf|first7=P. |last8=Porcelli|first8=D.|last9=Pröhl|first9=G.|last10=Twining|first10=J.|title=The Environmental Behaviour of Polonium|series=Technical reports series|volume=484|publisher=International Atomic Energy Agency|location=Vienna|date=2017|page=22|issn=0074-1914|isbn=978-92-0-112116-5}}

List of isotopes

{{Anchor|Polonium-200m1|Polonium-200m2|Polonium-204m|Polonium-208m|Polonium-209m|Polonium-210m1|Polonium-210m2}}

{{Isotopes table

|symbol=Po

|refs=

|notes=m, histname, unc(), mass#, exen#, spin(), spin#, daughter-nst, daughter-st

}}

|-id=Polonium-186

| ¹⁸⁶Po

| style="text-align:right" | 84

|style="text-align:right" | 102

| 186.004403(20)

| {{val|28|16|6|u=μs}}

|α

|¹⁸²Pb

| 0+

|-id=Polonium-187

| ¹⁸⁷Po

| style="text-align:right" | 84

| style="text-align:right" | 103

| 187.003030(40)

| 1.40(25) ms

| α

| ¹⁸³Pb

| 1/2−, 5/2−

|-id=Polonium-187m

| style="text-indent:1em" | ^187mPo

| colspan="3" style="text-indent:2em" | 4(27) keV

| 0.5 ms

| α

| ¹⁸³Pb

| 13/2+#

|-id=Polonium-188

| ¹⁸⁸Po

| style="text-align:right" | 84

| style="text-align:right" | 104

| 187.999416(21)

| 270(30) μs

| α

| ¹⁸⁴Pb

| 0+

|-id=Polonium-189

| ¹⁸⁹Po

| style="text-align:right" | 84

| style="text-align:right" | 105

| 188.998473(24)

| 3.5(5) ms

| α

| ¹⁸⁵Pb

| (5/2−)

|-id=Polonium-190

|¹⁹⁰Po

|style="text-align:right" | 84

| style="text-align:right" | 106

|189.995102(14)

|2.45(5) ms

| α

| ¹⁸⁶Pb

|0+

|-id=Polonium-191

|¹⁹¹Po

|style="text-align:right" | 84

|style="text-align:right" | 107

|190.994558(8)

|22(1) ms

| α

| ¹⁸⁷Pb

|3/2−

|-id=Polonium-191m

| style="text-indent:1em" | ^191mPo

| colspan="3" style="text-indent:2em" | 61(11) keV

| 93(3) ms

| α

| ^187mPb

| 13/2+

|-id=Polonium-192

| ¹⁹²Po

| style="text-align:right" | 84

| style="text-align:right" | 108

| 191.991340(11)

|32.2(3) ms

| α

| ¹⁸⁸Pb

|0+

|-id=Polonium-192m

| style="text-indent:1em" | ^192mPo

| colspan="3" style="text-indent:2em" | 2294.6(10) keV

| 580(100) ns

| IT

|¹⁹²Po

| 11−

|-id=Polonium-193

|¹⁹³Po

|style="text-align:right" | 84

| style="text-align:right" | 109

|192.991062(16)

|399(34) ms

| α

| ¹⁸⁹Pb

|3/2−

|-id=Polonium-193m

| style="text-indent:1em" | ^193mPo

| colspan="3" style="text-indent:2em" | 100(6) keV

|245(11) ms

| α

| ^189mPb

|13/2+

|-id=Polonium-194

| ¹⁹⁴Po

|style="text-align:right" | 84

|style="text-align:right" | 110

| 193.988186(14)

|392(4) ms

| α

| ¹⁹⁰Pb

| 0+

|-id=Polonium-194m

| style="text-indent:1em" | ^194mPo

| colspan="3" style="text-indent:2em" | 2313.4(3) keV

| 12.9(5) μs

| IT

|¹⁹⁴Po

| (10−)

|-id=Polonium-195

| rowspan=2|¹⁹⁵Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 111

| rowspan=2| 194.988066(6)

| rowspan=2|4.64(9) s

| α (94%)

| ¹⁹¹Pb

| rowspan=2|3/2−

| rowspan=2|

| β⁺?

| ¹⁹⁵Bi

|-id=Polonium-195m

| style="text-indent:1em" | ^195mPo

| colspan="3" style="text-indent:2em" | 148(9) keV

|1.92(2) s

| α

| ^191mPb

|13/2+

|-id=Polonium-196

| rowspan=2|¹⁹⁶Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 112

| rowspan=2|195.985541(6)

| rowspan=2|5.56(12) s

| α (94%)

| ¹⁹²Pb

| rowspan=2|0+

| rowspan=2|

| β⁺?

| ¹⁹⁶Bi

|-id=Polonium-196m

| style="text-indent:1em" | ^196mPo

| colspan="3" style="text-indent:2em" | 2493.9(4) keV

| 856(17) ns

|IT

|¹⁹⁶Po

| 11−

|-id=Polonium-197

| rowspan=2|¹⁹⁷Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 113

| rowspan=2|196.985622(11)

| rowspan=2|53.6(9) s

| β⁺?

| ¹⁹⁷Bi

| rowspan=2|(3/2−)

| rowspan=2|

| α (44%)

| ¹⁹³Pb

|-id=Polonium-197m

| rowspan=3 style="text-indent:1em" | ^197mPo

| rowspan=3|

| rowspan=3 colspan="3" style="text-indent:2em" | 196(12)# keV

| rowspan=3|25.8(1) s

| α (84%)

| ^193mPb

| rowspan=3|13/2+

| rowspan=3|

| β⁺?

| ¹⁹⁷Bi

| IT?

| ¹⁹⁷Po

|-id=Polonium-198

| rowspan=2|¹⁹⁸Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 114

| rowspan=2|197.983389(19)

| rowspan=2|1.760(24) min

| α (57%)

| ¹⁹⁴Pb

| rowspan=2|0+

| rowspan=2|

| β⁺ (43%)

| ¹⁹⁸Bi

|-id=Polonium-198m1

| style="text-indent:1em" | ^198m1Po

| colspan="3" style="text-indent:2em" | 2565.92(20) keV

| 200(20) ns

|IT

|¹⁹⁸Po

| 11−

|-id=Polonium-198m2

| style="text-indent:1em" | ^198m2Po

| colspan="3" style="text-indent:2em" | 2740(50)# keV

| 750(50) ns

|IT

|¹⁹⁸Po

| 12+

|-id=Polonium-199

| rowspan=2|¹⁹⁹Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 115

| rowspan=2|198.983666(25)

| rowspan=2|5.48(16) min

| β⁺ (92.5%)

| ¹⁹⁹Bi

| rowspan=2|(3/2−)

| rowspan=2|

| α (7.5%)

| ¹⁹⁵Pb

|-id=Polonium-199m

| rowspan=3 style="text-indent:1em" | ^199mPo

| rowspan=3|

| rowspan=3 colspan="3" style="text-indent:2em" | 312.0(28) keV

| rowspan=3|4.17(4) min

| β⁺ (73.5%)

| ¹⁹⁹Bi

| rowspan=3|13/2+

| rowspan=3|

| α (24%)

| ¹⁹⁵Pb

| IT (2.5%)

| ¹⁹⁹Po

|-id=Polonium-200

| rowspan=2|²⁰⁰Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 116

| rowspan=2|199.981799(15)

| rowspan=2|11.5(1) min

| β⁺ (88.8%)

| ²⁰⁰Bi

| rowspan=2|0+

| rowspan=2|

| α (11.1%)

| ¹⁹⁶Pb

|-id=Polonium-201

| rowspan=2|²⁰¹Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 117

| rowspan=2|200.982260(6)

| rowspan=2|15.3(2) min

| β⁺ (98.4%)

| ²⁰¹Bi

| rowspan=2|3/2−

| rowspan=2|

| α (1.6%)

| ¹⁹⁷Pb

|-id=Polonium-201m

| rowspan=3 style="text-indent:1em" | ^201mPo

| rowspan=3|

| rowspan=3 colspan="3" style="text-indent:2em" | 424.1(24) keV

| rowspan=3|8.9(2) min

| IT (56.2(12)%)

| ²⁰¹Po

| rowspan=3|13/2+

| rowspan=3|

| β⁺ (41.4(7)%)

| ²⁰¹Bi

| α (2.4(5)%)

| ¹⁹⁷Pb

|-id=Polonium-202

| rowspan=2|²⁰²Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 118

| rowspan=2|201.980758(16)

| rowspan=2|44.7(5) min

| β⁺ (98%)

| ²⁰²Bi

| rowspan=2|0+

| rowspan=2|

| α (2%)

| ¹⁹⁸Pb

|-id=Polonium-202m

| style="text-indent:1em" | ^202mPo

| colspan="3" style="text-indent:2em" | 2626.7(7) keV

| >200 ns

| 11−

|-id=Polonium-203

| rowspan=2|²⁰³Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 119

| rowspan=2|202.981420(28)

| rowspan=2|36.7(5) min

| β⁺ (99.89%)

| ²⁰³Bi

| rowspan=2|5/2−

| rowspan=2|

| α (.11%)

| ¹⁹⁹Pb

|-id=Polonium-203m1

| rowspan=2 style="text-indent:1em" | ^203m1Po

| rowspan=2|

| rowspan=2 colspan="3" style="text-indent:2em" | 641.49(17) keV

| rowspan=2|45(2) s

| IT (99.96%)

| ²⁰³Po

| rowspan=2|13/2+

| rowspan=2|

| α (.04%)

| ¹⁹⁹Pb

|-id=Polonium-203m2

| style="text-indent:1em" | ^203m2Po

| colspan="3" style="text-indent:2em" | 2158.5(6) keV

| >200 ns

|-id=Polonium-204

| rowspan=2|²⁰⁴Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 120

| rowspan=2|203.980318(12)

| rowspan=2|3.53(2) h

| β⁺ (99.33%)

| ²⁰⁴Bi

| rowspan=2|0+

| rowspan=2|

| α (.66%)

| ²⁰⁰Pb

|-id=Polonium-205

| rowspan=2|²⁰⁵Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 121

| rowspan=2|204.981203(21)

| rowspan=2|1.66(2) h

| β⁺ (99.96%)

| ²⁰⁵Bi

| rowspan=2|5/2−

| rowspan=2|

| α (.04%)

| ²⁰¹Pb

|-id=Polonium-205m1

| style="text-indent:1em" | ^205m1Po

| colspan="3" style="text-indent:2em" | 143.166(17) keV

| 310(60) ns

| 1/2−

|-id=Polonium-205m2

| style="text-indent:1em" | ^205m2Po

| colspan="3" style="text-indent:2em" | 880.30(4) keV

| 645 μs

| 13/2+

|-id=Polonium-205m3

| style="text-indent:1em" | ^205m3Po

| colspan="3" style="text-indent:2em" | 1461.21(21) keV

| 57.4(9) ms

| IT

| ²⁰⁵Po

| 19/2−

|-id=Polonium-205m4

| style="text-indent:1em" | ^205m4Po

| colspan="3" style="text-indent:2em" | 3087.2(4) keV

| 115(10) ns

| 29/2−

|-id=Polonium-206

| rowspan=2|²⁰⁶Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 122

| rowspan=2|205.980481(9)

| rowspan=2|8.8(1) d

| β⁺ (94.55%)

| ²⁰⁶Bi

| rowspan=2|0+

| rowspan=2|

| α (5.45%)

| ²⁰²Pb

|-id=Polonium-206m1

| style="text-indent:1em" | ^206m1Po

| colspan="3" style="text-indent:2em" | 1585.85(11) keV

| 222(10) ns

| (8+)#

|-id=Polonium-206m2

| style="text-indent:1em" | ^206m2Po

| colspan="3" style="text-indent:2em" | 2262.22(14) keV

| 1.05(6) μs

| (9−)#

|-id=Polonium-207

| rowspan=2|²⁰⁷Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 123

| rowspan=2|206.981593(7)

| rowspan=2|5.80(2) h

| β⁺ (99.97%)

| ²⁰⁷Bi

| rowspan=2|5/2−

| rowspan=2|

| α (.021%)

| ²⁰³Pb

|-id=Polonium-207m1

| style="text-indent:1em" | ^207m1Po

| colspan="3" style="text-indent:2em" | 68.573(14) keV

| 205(10) ns

| 1/2−

|-id=Polonium-207m2

| style="text-indent:1em" | ^207m2Po

| colspan="3" style="text-indent:2em" | 1115.073(16) keV

| 49(4) μs

| 13/2+

|-id=Polonium-207m3

| style="text-indent:1em" | ^207m3Po

| colspan="3" style="text-indent:2em" | 1383.15(6) keV

| 2.79(8) s

| IT

| ²⁰⁷Po

| 19/2−

|-id=Polonium-208

| rowspan=2|²⁰⁸Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 124

| rowspan=2|207.9812457(19)

| rowspan=2|2.898(2) y

| α (99.99%)

| ²⁰⁴Pb

| rowspan=2|0+

| rowspan=2|

| β⁺ (.00277%)

| ²⁰⁸Bi

|-id=Polonium-209

| rowspan=2|²⁰⁹Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 125

| rowspan=2|208.9824304(20)

| rowspan=2|124(3) y

| α (99.546%)

| ²⁰⁵Pb

| rowspan=2|1/2−

| rowspan=2|

| β⁺ (.454%)

| ²⁰⁹Bi

| ²¹⁰PoMost common isotope

| Radium F

| style="text-align:right" | 84

| style="text-align:right" | 126

| 209.9828737(13)

| 138.376(2) d

| α

| ²⁰⁶Pb

| 0+

| TraceIntermediate decay product of ²³⁸U

|-id=Polonium-210m

| style="text-indent:1em" | ^210mPo

| colspan="3" style="text-indent:2em" | 5057.61(4) keV

| 263(5) ns

| 16+

|-id=Polonium-211

| ²¹¹Po

| Actinium C'

| style="text-align:right" | 84

| style="text-align:right" | 127

| 210.9866532(14)

| 516(3) ms

| α

| ²⁰⁷Pb

| 9/2+

| TraceIntermediate decay product of ²³⁵U

|-id=Polonium-211m1

| rowspan=2 style="text-indent:1em" | ^211m1Po

| rowspan=2|

| rowspan=2 colspan="3" style="text-indent:2em" | 1462(5) keV

| rowspan=2|25.2(6) s

| α (99.98%)

| ²⁰⁷Pb

| rowspan=2|(25/2+)

| rowspan=2|

| IT (.016%)

| ²¹¹Po

|-id=Polonium-211m2

| style="text-indent:1em" | ^211m2Po

| colspan="3" style="text-indent:2em" | 2135.7(9) keV

| 243(21) ns

| (31/2−)

|-id=Polonium-211m3

| style="text-indent:1em" | ^211m3Po

| colspan="3" style="text-indent:2em" | 4873.3(17) keV

| 2.8(7) μs

| (43/2+)

|-id=Polonium-212

| ²¹²Po

| Thorium C'

| style="text-align:right" | 84

| style="text-align:right" | 128

| 211.9888680(13)

| 294.4(8) ns{{NUBASE2020|ref}}

| α

| ²⁰⁸Pb

| 0+

| TraceIntermediate decay product of ²³²Th

|-id=Polonium-212m

| rowspan=2 style="text-indent:1em" | ^212mPo

| rowspan=2|

| rowspan=2 colspan="3" style="text-indent:2em" | 2911(12) keV

| rowspan=2|45.1(6) s

| α (99.93%)

| ²⁰⁸Pb

| rowspan=2|(18+)

| rowspan=2|

| IT (.07%){{NUBASE 2003}}{{cite web|url=https://www.nndc.bnl.gov/nudat3/getdataset.jsp?nucleus=212Po&unc=NDS|title=Adopted Levels for ²¹²Po|publisher=NNDC Chart of Nuclides}}

| ²¹²Po

|-id=Polonium-213

| ²¹³Po

| style="text-align:right" | 84

| style="text-align:right" | 129

| 212.992857(3)

| 3.65(4) μs

| α

| ²⁰⁹Pb

| 9/2+

| TraceIntermediate decay product of ²³⁷Np

|-id=Polonium-214

| ²¹⁴Po

| Radium C'

| style="text-align:right" | 84

| style="text-align:right" | 130

| 213.9952014(16)

| 164.3(20) μs

| α

| ²¹⁰Pb

| 0+

| Trace

|-id=Polonium-215

| rowspan=2|²¹⁵Po

| rowspan=2|Actinium A

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 131

| rowspan=2|214.9994200(27)

| rowspan=2|1.781(4) ms

| α

| ²¹¹Pb

| rowspan=2|9/2+

| rowspan=2|Trace

| β⁻ (2.3×10⁻⁴%)

| ²¹⁵At

|-id=Polonium-216

|²¹⁶Po

|Thorium A

|style="text-align:right" | 84

| style="text-align:right" | 132

|216.0019150(24)

|145(2) ms

| α{{refn|group=n|Theoretically capable of β⁻β⁻ decay to ²¹⁶Rn{{NUBASE2020|ref}}}}

| ²¹²Pb

|0+

|Trace

|-id=Polonium-217

| rowspan=2|²¹⁷Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 133

| rowspan=2|217.006335(7)

| rowspan=2|1.47(5) s

| α (95%)

| ²¹³Pb

| rowspan=2|5/2+#

| rowspan=2|Trace

| β⁻ (5%)

| ²¹⁷At

|-id=Polonium-218

| rowspan=2|²¹⁸Po

| rowspan=2|Radium A

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 134

| rowspan=2|218.0089730(26)

| rowspan=2|3.10(1) min

| α (99.98%)

| ²¹⁴Pb

| rowspan=2|0+

| rowspan=2|Trace

| β⁻ (.02%)

| ²¹⁸At

|-id=Polonium-219

| rowspan=2|²¹⁹Po

| rowspan=2|

| rowspan=2 style="text-align:right" | 84

| rowspan=2 style="text-align:right" | 135

| rowspan=2|219.01361(16)

| rowspan=2|10.3(1) min

| β⁻ (71.8%)

| ²¹⁹At

| rowspan=2|9/2+#

| rowspan=2|

| α (28.2%)

| ²¹⁵Pb

|-id=Polonium-220

| ²²⁰Po

| style="text-align:right" | 84

| style="text-align:right" | 136

| 220.0164(18)

| 40# s
[>300 ns]

| β⁻

| ²²⁰At

| 0+

|-id=Polonium-221

| ²²¹Po

| style="text-align:right" | 84

| style="text-align:right" | 137

| 221.02123(20)

| 2.2(0.7) min

| β⁻

| ²²¹At

| 9/2+#

|-id=Polonium-222

| ²²²Po

| style="text-align:right" | 84

| style="text-align:right" | 138

| 222.024144(40)

| 9.1(7.2) min

| β⁻

| ²²²At

| 0+

|-id=Polonium-223

| ²²³Po

| style="text-align:right" | 84

| style="text-align:right" | 139

| 223.02907(21)#

| 6# s
[>300 ns]

| β⁻?

| ²²³At

| 11/2+#

|-id=Polonium-224

| ²²⁴Po

| style="text-align:right" | 84

| style="text-align:right" | 140

| 224.03211(21)#

| 3# min
[>300 ns]

| β⁻?

| ²²⁴At

| 0+

|-id=Polonium-225

| ²²⁵Po

| style="text-align:right" | 84

| style="text-align:right" | 141

| 225.03712(32)#

| 10# s
[>300 ns]

| β⁻?

| ²²⁵At

| 3/2+#

|-id=Polonium-226

| ²²⁶Po

| style="text-align:right" | 84

| style="text-align:right" | 142

| 226.04031(43)#

| 1# min
[>300 ns]

| β⁻?

| ²²⁶At

| 0+

|-id=Polonium-227

| ²²⁷Po

| style="text-align:right" | 84

| style="text-align:right" | 143

| 227.04539(43)#

| 2# s
[>300 ns]

| β⁻?

| ²²⁷At

| 5/2+#

References

;General references

Isotope data is sourced in:

Isotopic mass, spin and parity

:{{NUBASE 2003}}

:{{CRC85|chapter=11}}

:{{NNDC}}

Half-life

:{{NUBASE2016|plain}}

:{{NNDC}}

:{{CRC85|chapter=11}}

Category:Polonium

Polonium

Isotopes of polonium#Polonium-218

List of isotopes

See also

References