Isotopes of polonium

Template:Short description Template:Infobox polonium isotopes 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.

List of isotopes

Template:Isotopes table |-id=Polonium-186 | ¹⁸⁶Po | | style="text-align:right" | 84 |style="text-align:right" | 102 | 186.004403(20) |
|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 |- | ²¹⁰Po | Radium F | style="text-align:right" | 84 | style="text-align:right" | 126 | 209.9828737(13) | 138.376(2) d | α | ²⁰⁶Pb | 0+ | Trace |-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+ | Trace |-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) nsTemplate:NUBASE2020 | α | ²⁰⁸Pb | 0+ | Trace |-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%) | 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+ | Trace |-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 | αTemplate:Refn | 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+# | Template:Isotopes table/footer

See also

• Poisoning of Alexander Litvinenko (with ²¹⁰Po)

Daughter products other than polonium

• Isotopes of astatine
• Isotopes of bismuth
• Isotopes of lead

References

General references

Isotope data is sourced in:

• Isotopic mass, spin and parity

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• Half-life

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