Iridium-183

Properties and data of the isotope ¹⁸³Ir.

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-183; Ir-183Symbol:¹⁸³Ir or 18377IrMass number A:183 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:106Isotopic mass:182.956840(26) u (atomic weight of Iridium-183)Nuclide mass:182.9146038 u (calculated nuclear mass without electrons)Mass excess:-40.20328 MeVMass defect:1.56416856 u (per nucleus)Nuclear binding energy:1457.01362863 MeV (per nucleus)
7.96182311 MeV (average binding energy per nucleon)Separation energy:S_N = 9.22(3) MeV (first neutron)
S_P = 2.88(3) MeV (first proton)Half-life:58(6) minDecay constant λ:0.00019918022429883 s^-1Specific activity α:6.590611907919 × 10⁺¹⁷ Bq g^-1
17812464.615999 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Year of discovery:1961

Radioactive Decay

Half-life T_½ = 58(6) min (minutes) respectively 3.480 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁸³Os	100 %	3.46(6) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁸⁷Au, ¹⁸³Pt.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 183) with Iridium-183. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 106	Isobar A = 183
64	¹⁷⁰Gd
65	¹⁷¹Tb
66	¹⁷²Dy
67	¹⁷³Ho
68	¹⁷⁴Er
69	¹⁷⁵Tm
70	¹⁷⁶Yb	¹⁸³Yb
71	¹⁷⁷Lu	¹⁸³Lu
72	¹⁷⁸Hf	¹⁸³Hf
73	¹⁷⁹Ta	¹⁸³Ta
74	¹⁸⁰W	¹⁸³W
75	¹⁸¹Re	¹⁸³Re
76	¹⁸²Os	¹⁸³Os
77	¹⁸³Ir	¹⁸³Ir
78	¹⁸⁴Pt	¹⁸³Pt
79	¹⁸⁵Au	¹⁸³Au
80	¹⁸⁶Hg	¹⁸³Hg
81	¹⁸⁷Tl	¹⁸³Tl
82	¹⁸⁸Pb	¹⁸³Pb
83	¹⁸⁹Bi
84	¹⁹⁰Po
85	¹⁹¹At