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Isotopes of polonium

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.

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List of isotopes

Nuclide2HistoricnameZNIsotopic mass (Da)34Half-lifeDecaymodeDaughterisotope56Spin andparity78Isotopicabundance
Excitation energy9
186Po84102186.004403(20)28+16−6 μsα182Pb0+
187Po84103187.003030(40)1.40(25) msα183Pb1/2−, 5/2−
187mPo4(27) keV0.5 msα183Pb13/2+#
188Po84104187.999416(21)270(30) μsα184Pb0+
189Po84105188.998473(24)3.5(5) msα185Pb(5/2−)
190Po84106189.995102(14)2.45(5) msα186Pb0+
191Po84107190.994558(8)22(1) msα187Pb3/2−
191mPo61(11) keV93(3) msα187mPb13/2+
192Po84108191.991340(11)32.2(3) msα188Pb0+
192mPo2294.6(10) keV580(100) nsIT192Po11−
193Po84109192.991062(16)399(34) msα189Pb3/2−
193mPo100(6) keV245(11) msα189mPb13/2+
194Po84110193.988186(14)392(4) msα190Pb0+
194mPo2313.4(3) keV12.9(5) μsIT194Po(10−)
195Po84111194.988066(6)4.64(9) sα (94%)191Pb3/2−
β+?195Bi
195mPo148(9) keV1.92(2) sα191mPb13/2+
196Po84112195.985541(6)5.56(12) sα (94%)192Pb0+
β+?196Bi
196mPo2493.9(4) keV856(17) nsIT196Po11−
197Po84113196.985622(11)53.6(9) sβ+?197Bi(3/2−)
α (44%)193Pb
197mPo196(12)# keV25.8(1) sα (84%)193mPb13/2+
β+?197Bi
IT?197Po
198Po84114197.983389(19)1.760(24) minα (57%)194Pb0+
β+ (43%)198Bi
198m1Po2565.92(20) keV200(20) nsIT198Po11−
198m2Po2740(50)# keV750(50) nsIT198Po12+
199Po84115198.983666(25)5.48(16) minβ+ (92.5%)199Bi(3/2−)
α (7.5%)195Pb
199mPo312.0(28) keV4.17(4) minβ+ (73.5%)199Bi13/2+
α (24%)195Pb
IT (2.5%)199Po
200Po84116199.981799(15)11.5(1) minβ+ (88.8%)200Bi0+
α (11.1%)196Pb
201Po84117200.982260(6)15.3(2) minβ+ (98.4%)201Bi3/2−
α (1.6%)197Pb
201mPo424.1(24) keV8.9(2) minIT (56.2(12)%)201Po13/2+
β+ (41.4(7)%)201Bi
α (2.4(5)%)197Pb
202Po84118201.980758(16)44.7(5) minβ+ (98%)202Bi0+
α (2%)198Pb
202mPo2626.7(7) keV>200 ns11−
203Po84119202.981420(28)36.7(5) minβ+ (99.89%)203Bi5/2−
α (.11%)199Pb
203m1Po641.49(17) keV45(2) sIT (99.96%)203Po13/2+
α (.04%)199Pb
203m2Po2158.5(6) keV>200 ns
204Po84120203.980318(12)3.53(2) hβ+ (99.33%)204Bi0+
α (.66%)200Pb
205Po84121204.981203(21)1.66(2) hβ+ (99.96%)205Bi5/2−
α (.04%)201Pb
205m1Po143.166(17) keV310(60) ns1/2−
205m2Po880.30(4) keV645 μs13/2+
205m3Po1461.21(21) keV57.4(9) msIT205Po19/2−
205m4Po3087.2(4) keV115(10) ns29/2−
206Po84122205.980481(9)8.8(1) dβ+ (94.55%)206Bi0+
α (5.45%)202Pb
206m1Po1585.85(11) keV222(10) ns(8+)#
206m2Po2262.22(14) keV1.05(6) μs(9−)#
207Po84123206.981593(7)5.80(2) hβ+ (99.97%)207Bi5/2−
α (.021%)203Pb
207m1Po68.573(14) keV205(10) ns1/2−
207m2Po1115.073(16) keV49(4) μs13/2+
207m3Po1383.15(6) keV2.79(8) sIT207Po19/2−
208Po84124207.9812457(19)2.898(2) yα (99.99%)204Pb0+
β+ (.00277%)208Bi
209Po84125208.9824304(20)124(3) yα (99.546%)205Pb1/2−
β+ (.454%)209Bi
210Po10Radium F84126209.9828737(13)138.376(2) dα206Pb0+Trace11
210mPo5057.61(4) keV263(5) ns16+
211PoActinium C'84127210.9866532(14)516(3) msα207Pb9/2+Trace12
211m1Po1462(5) keV25.2(6) sα (99.98%)207Pb(25/2+)
IT (.016%)211Po
211m2Po2135.7(9) keV243(21) ns(31/2−)
211m3Po4873.3(17) keV2.8(7) μs(43/2+)
212PoThorium C'84128211.9888680(13)294.4(8) ns13α208Pb0+Trace14
212mPo2911(12) keV45.1(6) sα (99.93%)208Pb(18+)
IT (.07%)1516212Po
213Po84129212.992857(3)3.65(4) μsα209Pb9/2+Trace17
214PoRadium C'84130213.9952014(16)164.3(20) μsα210Pb0+Trace18
215PoActinium A84131214.9994200(27)1.781(4) msα211Pb9/2+Trace19
β− (2.3×10−4%)215At
216PoThorium A84132216.0019150(24)145(2) msα20212Pb0+Trace21
217Po84133217.006335(7)1.47(5) sα (95%)213Pb5/2+#Trace22
β− (5%)217At
218PoRadium A84134218.0089730(26)3.10(1) minα (99.98%)214Pb0+Trace23
β− (.02%)218At
219Po84135219.01361(16)10.3(1) minβ− (71.8%)219At9/2+#
α (28.2%)215Pb
220Po84136220.0164(18)40# s[>300 ns]β−220At0+
221Po84137221.02123(20)2.2(0.7) minβ−221At9/2+#
222Po84138222.024144(40)9.1(7.2) minβ−222At0+
223Po84139223.02907(21)#6# s[>300 ns]β−?223At11/2+#
224Po84140224.03211(21)#3# min[>300 ns]β−?224At0+
225Po84141225.03712(32)#10# s[>300 ns]β−?225At3/2+#
226Po84142226.04031(43)#1# min[>300 ns]β−?226At0+
227Po84143227.04539(43)#2# s[>300 ns]β−?227At5/2+#
This table header & footer:
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See also

Daughter products other than polonium

General references

Isotope data is sourced in:

  • Isotopic mass, spin and parity
Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (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 Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9. National Nuclear Data Center. "NuDat 3.0 database". Brookhaven National Laboratory.
  • Half-life
Audi, G.; Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S. (2017). "The NUBASE2016 evaluation of nuclear properties" (PDF). Chinese Physics C. 41 (3): 030001. Bibcode:2017ChPhC..41c0001A. doi:10.1088/1674-1137/41/3/030001. National Nuclear Data Center. "NuDat 3.0 database". Brookhaven National Laboratory. Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

References

  1. Carvalho, F.; Fernandes, S.; Fesenko, S.; Holm, E.; Howard, B.; Martin, P.; Phaneuf, P.; Porcelli, D.; Pröhl, G.; Twining, J. (2017). The Environmental Behaviour of Polonium. Technical reports series. Vol. 484. Vienna: International Atomic Energy Agency. p. 22. ISBN 978-92-0-112116-5. ISSN 0074-1914. 978-92-0-112116-5 ↩

  2. mPo – Excited nuclear isomer. /wiki/Nuclear_isomer ↩

  3. ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits. ↩

  4. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS). ↩

  5. Bold italics symbol as daughter – Daughter product is nearly stable. ↩

  6. Bold symbol as daughter – Daughter product is stable. ↩

  7. ( ) spin value – Indicates spin with weak assignment arguments. ↩

  8. # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). ↩

  9. # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). ↩

  10. Most common isotope ↩

  11. Intermediate decay product of 238U /wiki/Decay_product ↩

  12. Intermediate decay product of 235U /wiki/Uranium-235 ↩

  13. Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf ↩

  14. Intermediate decay product of 232Th /wiki/Thorium-232 ↩

  15. Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (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 /wiki/Aaldert_Wapstra ↩

  16. "Adopted Levels for 212Po". NNDC Chart of Nuclides. https://www.nndc.bnl.gov/nudat3/getdataset.jsp?nucleus=212Po&unc=NDS ↩

  17. Intermediate decay product of 237Np /wiki/Neptunium-237 ↩

  18. Intermediate decay product of 238U /wiki/Decay_product ↩

  19. Intermediate decay product of 235U /wiki/Uranium-235 ↩

  20. Theoretically capable of β−β− decay to 216Rn[1] ↩

  21. Intermediate decay product of 232Th /wiki/Thorium-232 ↩

  22. Intermediate decay product of 237Np /wiki/Neptunium-237 ↩

  23. Intermediate decay product of 238U /wiki/Decay_product ↩