Iridium-184
Properties and data of the isotope 184Ir.
See also: List of individual Iridium isotopes (and general data sources).
General data
Name of the isotope:Iridium-184; Ir-184Symbol:184Ir or 18477IrMass number A:184 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:107Isotopic mass:183.95748(3) u (atomic weight of Iridium-184)Nuclide mass:183.9152438 u (calculated nuclear mass without electrons)Mass excess:-39.60712 MeVMass defect:1.572193476 u (per nucleus)Nuclear binding energy:1464.48878973 MeV (per nucleus)
7.95917821 MeV (average binding energy per nucleon)Separation energy:SN = 7.48(4) MeV (first neutron)
SP = 3.24(6) MeV (first proton)Half-life:3.09(3) hDecay constant λ:6.23109655303 × 10-5 s-1Specific activity α:2.050521374549 × 10+17 Bq g-1
5541949.6609454 Ci g-1Spin and parity:
(nuclear angular momentum)5-Magnetic dipole moment:μ(μN) = + 0.696(5)Quadrupole moment Q:+ 2.41(3) barn (100 fm2)Nuclear g-factor:gl = 0.1392Charge radius:5.3805(1061) femtometer fmYear of discovery:1960
Radioactive Decay
Half-life T½ = 3.09(3) h (hours) respectively 1.1124 × 104 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 184Os | 100 % | 4.642(28) MeV | |
Parent Nuclides
Direct parent isotope is: 184Pt.
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 |
|---|
| 184m1Ir | 225.65(11) keV | 470(30) μs | 3+ |
| 184m2Ir | 328.40(24) keV | 350(90) ns | (7)+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 107) and isobaric (same nucleon number A = 184) with Iridium-184. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 107 | Isobar A = 184 |
|---|
| 65 | 172Tb | |
| 66 | 173Dy | |
| 67 | 174Ho | |
| 68 | 175Er | |
| 69 | 176Tm | |
| 70 | 177Yb | 184Yb |
| 71 | 178Lu | 184Lu |
| 72 | 179Hf | 184Hf |
| 73 | 180Ta | 184Ta |
| 74 | 181W | 184W |
| 75 | 182Re | 184Re |
| 76 | 183Os | 184Os |
| 77 | 184Ir | 184Ir |
| 78 | 185Pt | 184Pt |
| 79 | 186Au | 184Au |
| 80 | 187Hg | 184Hg |
| 81 | 188Tl | 184Tl |
| 82 | 189Pb | 184Pb |
| 83 | 190Bi | 184Bi |
| 84 | 191Po | |
| 85 | 192At | |
| 86 | 193Rn | |
External data and identifiers
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/iridium-184
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