Polonium-206
Properties and data of the isotope 206Po.
See also: List of individual Polonium isotopes (and general data sources).
General data
Name of the isotope:Polonium-206; Po-206Symbol:206Po or 20684PoMass number A:206 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:122Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.452380952381 (= neutron-proton ratio)Neutron excess (N-Z):38Isotopic mass:205.980474(4) u (atomic weight of Polonium-206)Nuclide mass:205.9343987 u (calculated nuclear mass without electrons)Mass excess:-18.18835 MeVMass defect:1.73394844 u (per nucleus)Nuclear binding energy:1615.16256817 MeV (per nucleus)
7.84059499 MeV (average binding energy per nucleon)Separation energy:SN = 8.739(11) MeV (first neutron)
SP = 4.413(6) MeV (first proton)Half-life:8.8(1) dDecay constant λ:9.116519104586 × 10-7 s-1Specific activity α:2.678095717079 × 10+15 Bq g-1
72380.965326468 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.5480(177) femtometer fmYear of discovery:1947
Radioactive Decay
Half-life T½ = 8.8(1) d respectively 7.6032 × 105 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 202Pb | 5.45(5) % | 5.3270(13) MeV | |
| EC/β+ | 206Bi | 94.55(5) % | 1.840(9) MeV | |
Parent Nuclides
Direct parent isotopes are: 210Rn, 206At.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 206m1Po | 1585.90(11) keV | 232(4) ns | 8+ |
| 206m2Po | 2.262.09(12) keV | 1.05(6) μs | 9- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 122) and isobaric (same nucleon number A = 206) with Polonium-206. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 122 | Isobar A = 206 |
|---|
| 74 | 196W | |
| 75 | 197Re | |
| 76 | 198Os | |
| 77 | 199Ir | |
| 78 | 200Pt | 206Pt |
| 79 | 201Au | 206Au |
| 80 | 202Hg | 206Hg |
| 81 | 203Tl | 206Tl |
| 82 | 204Pb | 206Pb |
| 83 | 205Bi | 206Bi |
| 84 | 206Po | 206Po |
| 85 | 207At | 206At |
| 86 | 208Rn | 206Rn |
| 87 | 209Fr | 206Fr |
| 88 | 210Ra | 206Ra |
| 89 | 211Ac | 206Ac |
| 90 | 212Th | |
| 91 | 213Pa | |
| 92 | 214U | |
External data and identifiers
Last update: 2020-10-07
Perma link: https://www.chemlin.org/isotope/polonium-206
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