Lead-206m1
Properties and data of the isotope 206m1Pb.
See also: List of individual Lead isotopes (and general data sources).
General data
Name of the isotope:Lead-206m1; Pb-206m1Symbol:206m1Pb or 206m182PbMass number A:206 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:124Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.5121951219512 (= neutron-proton ratio)Neutron excess (N-Z):42Excitation energy:2200.16(4) keVIsotopic mass:205.974466(8) u (atomic weight of Lead-206m1)Nuclide mass:205.9294876 u (calculated nuclear mass without electrons)Mass excess:-23.78477 MeVMass defect:1.741636208 u (per nucleus)Nuclear binding energy:1622.32367793 MeV (per nucleus)
7.87535766 MeV (average binding energy per nucleon)Half-life:125(2) μsDecay constant λ:5545.1774444796 s-1Specific activity α:1.628967788487 × 10+25 Bq g-1
4.402615644561 × 10+14 Ci g-1Spin and parity:
(nuclear angular momentum)7-Magnetic dipole moment:μ(μN) = -0.152(3)Quadrupole moment Q:0.33(5) barn (100 fm2)Nuclear g-factor:gl = -0.021714285714286
Radioactive Decay
Half-life T½ = 125(2) μs respectively 1.25 × 10-4 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| Iso | 206Pb | 100 % | | |
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 |
|---|
| 206Pb | | stable | 0+ |
| 206m2Pb | 4027.3(3) keV | 202(3) ns | 12+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 124) and isobaric (same nucleon number A = 206) with Lead-206m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 124 | Isobar A = 206 |
|---|
| 75 | 199Re | |
| 76 | 200Os | |
| 77 | 201Ir | |
| 78 | 202Pt | 206Pt |
| 79 | 203Au | 206Au |
| 80 | 204Hg | 206Hg |
| 81 | 205Tl | 206Tl |
| 82 | 206Pb | 206Pb |
| 83 | 207Bi | 206Bi |
| 84 | 208Po | 206Po |
| 85 | 209At | 206At |
| 86 | 210Rn | 206Rn |
| 87 | 211Fr | 206Fr |
| 88 | 212Ra | 206Ra |
| 89 | 213Ac | 206Ac |
| 90 | 214Th | |
| 91 | 215Pa | |
| 92 | 216U | |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/lead-206m1
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