Iridium-182

Properties and data of the isotope ¹⁸²Ir.

Content

General data

Name of the isotope:Iridium-182; Ir-182Symbol:¹⁸²Ir or 18277IrMass number A:182 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:105Isotopic mass:181.958076(23) u (atomic weight of Iridium-182)Nuclide mass:181.9158398 u (calculated nuclear mass without electrons)Mass excess:-39.05195 MeVMass defect:1.554267644 u (per nucleus)Nuclear binding energy:1447.79098478 MeV (per nucleus)
7.95489552 MeV (average binding energy per nucleon)Separation energy:S_N = 7.660(22) MeV (first neutron)
S_P = 2.79(3) MeV (first proton)Half-life:15(1) minDecay constant λ:0.00077016353395549 s^-1Specific activity α:2.562449329650 × 10⁺¹⁸ Bq g^-1
69255387.287841 Ci g^-1Spin and parity:
(nuclear angular momentum)3+Magnetic dipole moment:μ(μ_N) = + 2.6(2)Quadrupole moment Q:- 1.70(6) barn (100 fm²)Nuclear g-factor:g_l = 0.86666666666667Year of discovery:1961

Radioactive Decay

Half-life T_½ = 15(1) min (minutes) respectively 9.00 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁸²Os	100 %	5.56(3) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸²Pt.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 105) and isobaric (same nucleon number A = 182) with Iridium-182. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 105	Isobar A = 182
63	¹⁶⁸Eu
64	¹⁶⁹Gd
65	¹⁷⁰Tb
66	¹⁷¹Dy
67	¹⁷²Ho
68	¹⁷³Er
69	¹⁷⁴Tm
70	¹⁷⁵Yb	¹⁸²Yb
71	¹⁷⁶Lu	¹⁸²Lu
72	¹⁷⁷Hf	¹⁸²Hf
73	¹⁷⁸Ta	¹⁸²Ta
74	¹⁷⁹W	¹⁸²W
75	¹⁸⁰Re	¹⁸²Re
76	¹⁸¹Os	¹⁸²Os
77	¹⁸²Ir	¹⁸²Ir
78	¹⁸³Pt	¹⁸²Pt
79	¹⁸⁴Au	¹⁸²Au
80	¹⁸⁵Hg	¹⁸²Hg
81	¹⁸⁶Tl	¹⁸²Tl
82	¹⁸⁷Pb	¹⁸²Pb
83	¹⁸⁸Bi
84	¹⁸⁹Po
85	¹⁹⁰At