Iridium-167

Properties and data of the isotope ¹⁶⁷Ir.

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-167; Ir-167Symbol:¹⁶⁷Ir or 16777IrMass number A:167 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:90Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.1688311688312 (= neutron-proton ratio)Neutron excess (N-Z):13Isotopic mass:166.981672(20) u (atomic weight of Iridium-167)Nuclide mass:166.9394358 u (calculated nuclear mass without electrons)Mass excess:-17.07242 MeVMass defect:1.400697904 u (per nucleus)Nuclear binding energy:1304.74169339 MeV (per nucleus)
7.81282451 MeV (average binding energy per nucleon)Half-life:35.2(20) msDecay constant λ:19.691681265908 s^-1Specific activity α:7.143739659775 × 10⁺²² Bq g^-1
1930740448588 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Year of discovery:1981

Radioactive Decay

Half-life T_½ = 35.2(20) ms respectively 3.52 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
α	¹⁶³Re	48(6) %	6.5049(26) MeV
p	¹⁶⁶Os	32(4) %
EC/β⁺	¹⁶⁷Os	20(10) %	9,43(7) MeV

Parent Nuclides

Direct parent isotope is: ¹⁷¹Au.

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
^167mIr	175.3(22) keV	30.0(6) ms	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 90) and isobaric (same nucleon number A = 167) with Iridium-167. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 90	Isobar A = 167
50	¹⁴⁰Sn
51	¹⁴¹Sb
52	¹⁴²Te
53	¹⁴³I
54	¹⁴⁴Xe
55	¹⁴⁵Cs
56	¹⁴⁶Ba
57	¹⁴⁷La
58	¹⁴⁸Ce
59	¹⁴⁹Pr
60	¹⁵⁰Nd
61	¹⁵¹Pm
62	¹⁵²Sm
63	¹⁵³Eu	¹⁶⁷Eu
64	¹⁵⁴Gd	¹⁶⁷Gd
65	¹⁵⁵Tb	¹⁶⁷Tb
66	¹⁵⁶Dy	¹⁶⁷Dy
67	¹⁵⁷Ho	¹⁶⁷Ho
68	¹⁵⁸Er	¹⁶⁷Er
69	¹⁵⁹Tm	¹⁶⁷Tm
70	¹⁶⁰Yb	¹⁶⁷Yb
71	¹⁶¹Lu	¹⁶⁷Lu
72	¹⁶²Hf	¹⁶⁷Hf
73	¹⁶³Ta	¹⁶⁷Ta
74	¹⁶⁴W	¹⁶⁷W
75	¹⁶⁵Re	¹⁶⁷Re
76	¹⁶⁶Os	¹⁶⁷Os
77	¹⁶⁷Ir	¹⁶⁷Ir
78	¹⁶⁸Pt	¹⁶⁷Pt
80	¹⁷⁰Hg