Iridium-190m2

Properties and data of the isotope ^190m2Ir.

Contents

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

General data

Name of the isotope:Iridium-190m2; Ir-190m2Symbol:^190m2Ir or 190m277IrMass number A:190 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:113Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4675324675325 (= neutron-proton ratio)Neutron excess (N-Z):36Excitation energy:376.4(1) keVIsotopic mass:189.9605434(15) u (atomic weight of Iridium-190m2)Nuclide mass:189.9183072 u (calculated nuclear mass without electrons)Mass excess:-36.75359 MeVMass defect:1.621119572 u (per nucleus)Nuclear binding energy:1510.0631546 MeV (per nucleus)
7.94770081 MeV (average binding energy per nucleon)Half-life:3.087(12) hDecay constant λ:6.237264290110 × 10^-5 s^-1Specific activity α:1.987390695010 × 10⁺¹⁷ Bq g^-1
5371326.2027308 Ci g^-1Spin and parity:
(nuclear angular momentum)(11)-

Radioactive Decay

Half-life T_½ = 3.087(12) h (hours) respectively 1.1113 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹⁰Ir	8.6(2) %
EC/β⁺	¹⁹⁰Os	91.4(2) %

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
^190m1Ir	26.1(1) keV	1.120(3) h	(1-)
¹⁹⁰Ir		11.7511(20) d	4-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 113) and isobaric (same nucleon number A = 190) with Iridium-190m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 113	Isobar A = 190
70	¹⁸³Yb
71	¹⁸⁴Lu
72	¹⁸⁵Hf	¹⁹⁰Hf
73	¹⁸⁶Ta	¹⁹⁰Ta
74	¹⁸⁷W	¹⁹⁰W
75	¹⁸⁸Re	¹⁹⁰Re
76	¹⁸⁹Os	¹⁹⁰Os
77	¹⁹⁰Ir	¹⁹⁰Ir
78	¹⁹¹Pt	¹⁹⁰Pt
79	¹⁹²Au	¹⁹⁰Au
80	¹⁹³Hg	¹⁹⁰Hg
81	¹⁹⁴Tl	¹⁹⁰Tl
82	¹⁹⁵Pb	¹⁹⁰Pb
83	¹⁹⁶Bi	¹⁹⁰Bi
84	¹⁹⁷Po	¹⁹⁰Po
85	¹⁹⁸At	¹⁹⁰At
86	¹⁹⁹Rn
87	²⁰⁰Fr
88	²⁰¹Ra