Polonium-192m

Properties and data of the isotope ^192mPo.

Contents

See also: List of individual Polonium isotopes (and general data sources).

General data

Name of the isotope:Polonium-192m; Po-192mSymbol:^192mPo or 192m84PoMass number A:192 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:108Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2857142857143 (= neutron-proton ratio)Neutron excess (N-Z):24Excitation energy:2294.6 keVIsotopic mass:191.991336(12) u (atomic weight of Polonium-192m)Nuclide mass:191.9452607 u (calculated nuclear mass without electrons)Mass excess:-8.07046 MeVMass defect:1.601777616 u (per nucleus)Nuclear binding energy:1492.04623864 MeV (per nucleus)
7.77107416 MeV (average binding energy per nucleon)Half-life:0.58(10) μsDecay constant λ:1195081.345793 s^-1Specific activity α:3.768035708611 × 10⁺²⁷ Bq g^-1
1.018388029354 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(11-)

Radioactive Decay

Half-life T_½ = 0.58(10) μs respectively 5.8 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹²Po	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
¹⁹²Po		32.2(3) ms	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 108) and isobaric (same nucleon number A = 192) with Polonium-192m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 108	Isobar A = 192
66	¹⁷⁴Dy
67	¹⁷⁵Ho
68	¹⁷⁶Er
69	¹⁷⁷Tm
70	¹⁷⁸Yb
71	¹⁷⁹Lu
72	¹⁸⁰Hf
73	¹⁸¹Ta	¹⁹²Ta
74	¹⁸²W	¹⁹²W
75	¹⁸³Re	¹⁹²Re
76	¹⁸⁴Os	¹⁹²Os
77	¹⁸⁵Ir	¹⁹²Ir
78	¹⁸⁶Pt	¹⁹²Pt
79	¹⁸⁷Au	¹⁹²Au
80	¹⁸⁸Hg	¹⁹²Hg
81	¹⁸⁹Tl	¹⁹²Tl
82	¹⁹⁰Pb	¹⁹²Pb
83	¹⁹¹Bi	¹⁹²Bi
84	¹⁹²Po	¹⁹²Po
85	¹⁹³At	¹⁹²At
86	¹⁹⁴Rn