Bismuth-210m

Properties and data of the isotope ^210mBi.

Contents

General data

Name of the isotope:Bismuth-210m; Bi-210mOther names:Radium ESymbol:^210mBi or 210m83BiMass number A:210 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:127Isotopic mass:209.9841202(15) u (atomic weight of Bismuth-210m)
Excitation energy: 271.31(11) keVNuclide mass:209.9385933 u (calculated nuclear mass without electrons)Mass excess:-14.79194 MeVMass defect:1.765801788 u (per nucleus)Nuclear binding energy:1644.83377071 MeV (per nucleus)
7.83254177 MeV (average binding energy per nucleon)Half-life:3.04(6) × 10⁶ aDecay constant λ:7.230116088713 × 10^-15 s^-1Specific activity α:20832907.904271 Bq g^-1
0.0005630515649803 Ci g^-1Spin and parity:
(nuclear angular momentum)9-Magnetic dipole moment:μ(μ_N) = 2.728(42)Quadrupole moment Q:0.471(59) barn (100 fm²)Nuclear g-factor:g_l = 0.30311111111111

Radioactive Decay

Half-life T_½ = 3.04(6) × 10⁶ a respectively 9.586944 × 10¹³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²¹⁰Tl	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
²¹⁰Bi		5.012(5) d	1-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 127) and isobaric (same nucleon number A = 210) with Bismuth-210m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 127	Isobar A = 210
76	²⁰³Os
77	²⁰⁴Ir
78	²⁰⁵Pt
79	²⁰⁶Au	²¹⁰Au
80	²⁰⁷Hg	²¹⁰Hg
81	²⁰⁸Tl	²¹⁰Tl
82	²⁰⁹Pb	²¹⁰Pb
83	²¹⁰Bi	²¹⁰Bi
84	²¹¹Po	²¹⁰Po
85	²¹²At	²¹⁰At
86	²¹³Rn	²¹⁰Rn
87	²¹⁴Fr	²¹⁰Fr
88	²¹⁵Ra	²¹⁰Ra
89	²¹⁶Ac	²¹⁰Ac
90	²¹⁷Th	²¹⁰Th
91	²¹⁸Pa
92	²¹⁹U