Bismuth-206m

Properties and data of the isotope ^206mBi.

Contents

General data

Name of the isotope:Bismuth-206m; Bi-206mSymbol:^206mBi or 206m83BiMass number A:206 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:123Isotopic mass:205.978499(8) u (atomic weight of Bismuth-206m)
Excitation energy: 1044.8(7) keVNuclide mass:205.9329721 u (calculated nuclear mass without electrons)Mass excess:-20.02805 MeVMass defect:1.736763324 u (per nucleus)Nuclear binding energy:1617.78461573 MeV (per nucleus)
7.85332338 MeV (average binding energy per nucleon)Half-life:0.89(1) msDecay constant λ:778.81705680893 s^-1Specific activity α:2.287876107426 × 10⁺²⁴ Bq g^-1
61834489389911 Ci g^-1Spin and parity:
(nuclear angular momentum)10-Magnetic dipole moment:μ(μ_N) = 2.644(14)Quadrupole moment Q:0.049(9) barn (100 fm²)Nuclear g-factor:g_l = 0.2644

Radioactive Decay

Half-life T_½ = 0.89(1) ms respectively 8.9 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	²⁰⁶Bi	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
²⁰⁶Bi		6.243(3) d	6+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 123) and isobaric (same nucleon number A = 206) with Bismuth-206m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 123	Isobar A = 206
74	¹⁹⁷W
75	¹⁹⁸Re
76	¹⁹⁹Os
77	²⁰⁰Ir
78	²⁰¹Pt	²⁰⁶Pt
79	²⁰²Au	²⁰⁶Au
80	²⁰³Hg	²⁰⁶Hg
81	²⁰⁴Tl	²⁰⁶Tl
82	²⁰⁵Pb	²⁰⁶Pb
83	²⁰⁶Bi	²⁰⁶Bi
84	²⁰⁷Po	²⁰⁶Po
85	²⁰⁸At	²⁰⁶At
86	²⁰⁹Rn	²⁰⁶Rn
87	²¹⁰Fr	²⁰⁶Fr
88	²¹¹Ra	²⁰⁶Ra
89	²¹²Ac	²⁰⁶Ac
90	²¹³Th
91	²¹⁴Pa
92	²¹⁵U