Iridium-167m
Properties and data of the isotope 167mIr.
See also: List of individual Iridium isotopes (and general data sources).
General data
Name of the isotope:Iridium-167m; Ir-167mSymbol:167mIr or 167m77IrMass 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):13Excitation energy:175.3(22) keVIsotopic mass:166.981672(20) u (atomic weight of Iridium-167m)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:30.0(6) msDecay constant λ:23.104906018665 s-1Specific activity α:8.381987867469 × 10+22 Bq g-1
2265402126343.2 Ci g-1Spin and parity:
(nuclear angular momentum)11/2-
Radioactive Decay
Half-life T½ = 30.0(6) ms respectively 3.0 × 10-2 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 163Re | 80(10) % | | |
| EC/β+ | 167Os | 20(10) % | | |
| p | 166Os | 0.4(1) % | | |
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 |
|---|
| 167Ir | | 35.2(20) ms | 1/2+ |
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-167m. 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 | |
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/iridium-167m
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