Iridium-174m
Properties and data of the isotope 174mIr.
See also: List of individual Iridium isotopes (and general data sources).
General data
Name of the isotope:Iridium-174m; Ir-174mSymbol:174mIr or 174m77IrMass number A:174 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:97Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.2597402597403 (= neutron-proton ratio)Neutron excess (N-Z):20Excitation energy:193(11) keVIsotopic mass:173.966867(26) u (atomic weight of Iridium-174m)Nuclide mass:173.9246308 u (calculated nuclear mass without electrons)Mass excess:-30.86319 MeVMass defect:1.476157316 u (per nucleus)Nuclear binding energy:1375.03168291 MeV (per nucleus)
7.90248094 MeV (average binding energy per nucleon)Half-life:4.9(3) sDecay constant λ:0.14145860827754 s-1Specific activity α:4.924183034092 × 10+20 Bq g-1
13308602794.844 Ci g-1Spin and parity:
(nuclear angular momentum)(7+)
Radioactive Decay
Half-life T½ = 4.9(3) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 170Re | 2.5(3) % | | |
| EC | 174Os | 97.5(3) % | | |
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 |
|---|
| 174Ir | | 7.9(6) s | (3+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 174) with Iridium-174m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 97 | Isobar A = 174 |
|---|
| 56 | 153Ba | |
| 57 | 154La | |
| 58 | 155Ce | |
| 59 | 156Pr | |
| 60 | 157Nd | |
| 61 | 158Pm | |
| 62 | 159Sm | |
| 63 | 160Eu | |
| 64 | 161Gd | |
| 65 | 162Tb | |
| 66 | 163Dy | 174Dy |
| 67 | 164Ho | 174Ho |
| 68 | 165Er | 174Er |
| 69 | 166Tm | 174Tm |
| 70 | 167Yb | 174Yb |
| 71 | 168Lu | 174Lu |
| 72 | 169Hf | 174Hf |
| 73 | 170Ta | 174Ta |
| 74 | 171W | 174W |
| 75 | 172Re | 174Re |
| 76 | 173Os | 174Os |
| 77 | 174Ir | 174Ir |
| 78 | 175Pt | 174Pt |
| 79 | 176Au | 174Au |
| 80 | 177Hg | 174Hg |
| 81 | 178Tl | |
| 82 | 179Pb | |
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/iridium-174m
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