Polonium-206m1

Properties and data of the isotope ²⁰⁶Po.

Content

General data

Name of the isotope:Polonium-206m1; Po-206m1Symbol:²⁰⁶Po or 20684PoMass number A:206 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:122Isotopic mass:205.980474(4) u (atomic weight of Polonium-206m1)
Excitation energy: 1585.90(11) keVNuclide 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)Half-life:232(4) nsDecay constant λ:2987703.3644825 s^-1Specific activity α:8.776766101766 × 10⁺²⁷ Bq g^-1
2.372098946423 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)8+Magnetic dipole moment:μ(μ_N) = +7.34(7)Quadrupole moment Q:1.02(4) barn (100 fm²)Nuclear g-factor:g_l = 0.9175

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
²⁰⁶Po		8.8(1) d	0+
^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-206m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	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