Iridium-180

Properties and data of the isotope ¹⁸⁰Ir.

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-180; Ir-180Symbol:¹⁸⁰Ir or 18077IrMass number A:180 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:103Isotopic mass:179.959229(23) u (atomic weight of Iridium-180)Nuclide mass:179.9169928 u (calculated nuclear mass without electrons)Mass excess:-37.97794 MeVMass defect:1.535784812 u (per nucleus)Nuclear binding energy:1430.57433767 MeV (per nucleus)
7.94763521 MeV (average binding energy per nucleon)Separation energy:S_N = 7.967(24) MeV (first neutron)
S_P = 2.247(27) MeV (first proton)Half-life:1.5(1) minDecay constant λ:0.0077016353395549 s^-1Specific activity α:2.591080048417 × 10⁺¹⁹ Bq g^-1
700291904.97759 Ci g^-1Spin and parity:
(nuclear angular momentum)(5+)Year of discovery:1972

Radioactive Decay

Half-life T_½ = 1.5(1) min (minutes) respectively 9 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁸⁰Os	100 %	6.380(27) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁸⁴Au, ¹⁸⁰Pt.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 103) and isobaric (same nucleon number A = 180) with Iridium-180. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 103	Isobar A = 180
60	¹⁶³Nd
62	¹⁶⁵Sm
63	¹⁶⁶Eu
64	¹⁶⁷Gd
65	¹⁶⁸Tb
66	¹⁶⁹Dy
67	¹⁷⁰Ho
68	¹⁷¹Er
69	¹⁷²Tm
70	¹⁷³Yb	¹⁸⁰Yb
71	¹⁷⁴Lu	¹⁸⁰Lu
72	¹⁷⁵Hf	¹⁸⁰Hf
73	¹⁷⁶Ta	¹⁸⁰Ta
74	¹⁷⁷W	¹⁸⁰W
75	¹⁷⁸Re	¹⁸⁰Re
76	¹⁷⁹Os	¹⁸⁰Os
77	¹⁸⁰Ir	¹⁸⁰Ir
78	¹⁸¹Pt	¹⁸⁰Pt
79	¹⁸²Au	¹⁸⁰Au
80	¹⁸³Hg	¹⁸⁰Hg
81	¹⁸⁴Tl	¹⁸⁰Tl
82	¹⁸⁵Pb	¹⁸⁰Pb
83	¹⁸⁶Bi
84	¹⁸⁷Po
85	¹⁸⁸At