Polonium-194m

Properties and data of the isotope ^194mPo.

Contents

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

General data

Name of the isotope:Polonium-194m; Po-194mSymbol:^194mPo or 194m84PoMass number A:194 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:110Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3095238095238 (= neutron-proton ratio)Neutron excess (N-Z):26Excitation energy:2525.2(8) keVIsotopic mass:193.988186(14) u (atomic weight of Polonium-194m)Nuclide mass:193.9421107 u (calculated nuclear mass without electrons)Mass excess:-11.00467 MeVMass defect:1.622257448 u (per nucleus)Nuclear binding energy:1511.12307927 MeV (per nucleus)
7.78929422 MeV (average binding energy per nucleon)Half-life:15(2) μsDecay constant λ:46209.81203733 s^-1Specific activity α:1.441875633160 × 10⁺²⁶ Bq g^-1
3.896961170704 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)(11-)

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
¹⁹⁴Po		0.392(4) s	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 194) with Polonium-194m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 110	Isobar A = 194
69	¹⁷⁹Tm
70	¹⁸⁰Yb
71	¹⁸¹Lu
72	¹⁸²Hf
73	¹⁸³Ta	¹⁹⁴Ta
74	¹⁸⁴W	¹⁹⁴W
75	¹⁸⁵Re	¹⁹⁴Re
76	¹⁸⁶Os	¹⁹⁴Os
77	¹⁸⁷Ir	¹⁹⁴Ir
78	¹⁸⁸Pt	¹⁹⁴Pt
79	¹⁸⁹Au	¹⁹⁴Au
80	¹⁹⁰Hg	¹⁹⁴Hg
81	¹⁹¹Tl	¹⁹⁴Tl
82	¹⁹²Pb	¹⁹⁴Pb
83	¹⁹³Bi	¹⁹⁴Bi
84	¹⁹⁴Po	¹⁹⁴Po
85	¹⁹⁵At	¹⁹⁴At
86	¹⁹⁶Rn	¹⁹⁴Rn