Gold-190m

Properties and data of the isotope ¹⁹⁰Au.

Content

General data

Name of the isotope:Gold-190m; Au-190mSymbol:¹⁹⁰Au or 19079AuMass number A:190 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:111Isotopic mass:189.964752(4) u (atomic weight of Gold-190m)
Excitation energy: +x keVNuclide mass:189.9214189 u (calculated nuclear mass without electrons)Mass excess:-32.8333 MeVMass defect:1.615231204 u (per nucleus)Nuclear binding energy:1504.57817514 MeV (per nucleus)
7.9188325 MeV (average binding energy per nucleon)Half-life:125(20) msDecay constant λ:5.5451774444796 s^-1Specific activity α:1.766869823492 × 10⁺²² Bq g^-1
477532384727.59 Ci g^-1Spin and parity:
(nuclear angular momentum)(11-)

Radioactive Decay

Half-life T_½ = 125(20) ms respectively 1.25 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹⁰Au	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
¹⁹⁰Au		42.8(10) min	1-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 111) and isobaric (same nucleon number A = 190) with Gold-190m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 111	Isobar A = 190
70	¹⁸¹Yb
71	¹⁸²Lu
72	¹⁸³Hf	¹⁹⁰Hf
73	¹⁸⁴Ta	¹⁹⁰Ta
74	¹⁸⁵W	¹⁹⁰W
75	¹⁸⁶Re	¹⁹⁰Re
76	¹⁸⁷Os	¹⁹⁰Os
77	¹⁸⁸Ir	¹⁹⁰Ir
78	¹⁸⁹Pt	¹⁹⁰Pt
79	¹⁹⁰Au	¹⁹⁰Au
80	¹⁹¹Hg	¹⁹⁰Hg
81	¹⁹²Tl	¹⁹⁰Tl
82	¹⁹³Pb	¹⁹⁰Pb
83	¹⁹⁴Bi	¹⁹⁰Bi
84	¹⁹⁵Po	¹⁹⁰Po
85	¹⁹⁶At	¹⁹⁰At
86	¹⁹⁷Rn