Iridium-170m
Properties and data of the isotope 170mIr.
See also: List of individual Iridium isotopes (and general data sources).
General data
Name of the isotope:Iridium-170m; Ir-170mSymbol:170mIr or 170m77IrMass number A:170 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:93Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.2077922077922 (= neutron-proton ratio)Neutron excess (N-Z):16Excitation energy:+x keVIsotopic mass:169.97492(9) u (atomic weight of Iridium-170m)Nuclide mass:169.9326838 u (calculated nuclear mass without electrons)Mass excess:-23.36187 MeVMass defect:1.433444652 u (per nucleus)Nuclear binding energy:1335.24509267 MeV (per nucleus)
7.8543829 MeV (average binding energy per nucleon)Half-life:811(18) msDecay constant λ:0.854682096868 s-1Specific activity α:3.045571584500 × 10+21 Bq g-1
82312745527.03 Ci g-1Spin and parity:
(nuclear angular momentum)(8+)
Radioactive Decay
Half-life T½ = 811(18) ms respectively 8.11 × 10-1 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 166Re | 38(5) % | | |
| EC/β+ | 170Os | ? | | |
| Iso | 170Ir | ? | | |
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 |
|---|
| 170Ir | | 0.87 s | (3-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 170) with Iridium-170m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 93 | Isobar A = 170 |
|---|
| 54 | 147Xe | |
| 55 | 148Cs | |
| 56 | 149Ba | |
| 57 | 150La | |
| 58 | 151Ce | |
| 59 | 152Pr | |
| 60 | 153Nd | |
| 61 | 154Pm | |
| 62 | 155Sm | |
| 63 | 156Eu | |
| 64 | 157Gd | 170Gd |
| 65 | 158Tb | 170Tb |
| 66 | 159Dy | 170Dy |
| 67 | 160Ho | 170Ho |
| 68 | 161Er | 170Er |
| 69 | 162Tm | 170Tm |
| 70 | 163Yb | 170Yb |
| 71 | 164Lu | 170Lu |
| 72 | 165Hf | 170Hf |
| 73 | 166Ta | 170Ta |
| 74 | 167W | 170W |
| 75 | 168Re | 170Re |
| 76 | 169Os | 170Os |
| 77 | 170Ir | 170Ir |
| 78 | 171Pt | 170Pt |
| 79 | 172Au | 170Au |
| 80 | 173Hg | 170Hg |
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/iridium-170m
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