Iridium-179

Properties and data of the isotope ¹⁷⁹Ir.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Iridium-179; Ir-179Symbol:¹⁷⁹Ir or 17977IrMass number A:179 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:102Isotopic mass:178.959118(10) u (atomic weight of Iridium-179)Nuclide mass:178.9168818 u (calculated nuclear mass without electrons)Mass excess:-38.08134 MeVMass defect:1.527230896 u (per nucleus)Nuclear binding energy:1422.60641624 MeV (per nucleus)
7.94752188 MeV (average binding energy per nucleon)Separation energy:S_N = 9.901(22) MeV (first neutron)
S_P = 1.826(17) MeV (first proton)Half-life:79(1) sDecay constant λ:0.0087740149437968 s^-1Specific activity α:2.968446848243 × 10⁺¹⁹ Bq g^-1
802282931.9577 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2)-Year of discovery:1992

Radioactive Decay

Half-life T_½ = 79(1) s respectively 7.9 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁷⁹Os	100 %	4.938(19) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁸³Au, ¹⁷⁹Pt.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 102) and isobaric (same nucleon number A = 179) with Iridium-179. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 102	Isobar A = 179
60	¹⁶²Nd
61	¹⁶³Pm
62	¹⁶⁴Sm
63	¹⁶⁵Eu
64	¹⁶⁶Gd
65	¹⁶⁷Tb
66	¹⁶⁸Dy
67	¹⁶⁹Ho
68	¹⁷⁰Er
69	¹⁷¹Tm	¹⁷⁹Tm
70	¹⁷²Yb	¹⁷⁹Yb
71	¹⁷³Lu	¹⁷⁹Lu
72	¹⁷⁴Hf	¹⁷⁹Hf
73	¹⁷⁵Ta	¹⁷⁹Ta
74	¹⁷⁶W	¹⁷⁹W
75	¹⁷⁷Re	¹⁷⁹Re
76	¹⁷⁸Os	¹⁷⁹Os
77	¹⁷⁹Ir	¹⁷⁹Ir
78	¹⁸⁰Pt	¹⁷⁹Pt
79	¹⁸¹Au	¹⁷⁹Au
80	¹⁸²Hg	¹⁷⁹Hg
81	¹⁸³Tl	¹⁷⁹Tl
82	¹⁸⁴Pb	¹⁷⁹Pb
83	¹⁸⁵Bi
84	¹⁸⁶Po