Iridium-165m
Properties and data of the isotope 165mIr.
See also: List of individual Iridium isotopes (and general data sources).
General data
Name of the isotope:Iridium-165m; Ir-165mSymbol:165mIr or 165m77IrMass number A:165 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:88Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.1428571428571 (= neutron-proton ratio)Neutron excess (N-Z):11Excitation energy:180(50) keVIsotopic mass:164.98755(17) u (atomic weight of Iridium-165m)Nuclide mass:164.9453138 u (calculated nuclear mass without electrons)Mass excess:-11.5971 MeVMass defect:1.377490072 u (per nucleus)Nuclear binding energy:1283.12373713 MeV (per nucleus)
7.7765075 MeV (average binding energy per nucleon)Half-life:0.30(6) msDecay constant λ:2310.4906018665 s-1Specific activity α:8.484207231707 × 10+24 Bq g-1
2.293028981542 × 10+14 Ci g-1Spin and parity:
(nuclear angular momentum)(11/2-)
Radioactive Decay
Half-life T½ = 0.30(6) ms respectively 3.0 × 10-4 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| p | 164Os | 87(4) % | | |
| α | 161Re | 13(4) % | | |
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 |
|---|
| 165Ir | | 1 μs | (1/2+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 165) with Iridium-165m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 88 | Isobar A = 165 |
|---|
| 49 | 137In | |
| 50 | 138Sn | |
| 51 | 139Sb | |
| 52 | 140Te | |
| 53 | 141I | |
| 54 | 142Xe | |
| 55 | 143Cs | |
| 56 | 144Ba | |
| 57 | 145La | |
| 58 | 146Ce | |
| 59 | 147Pr | |
| 60 | 148Nd | |
| 61 | 149Pm | |
| 62 | 150Sm | 165Sm |
| 63 | 151Eu | 165Eu |
| 64 | 152Gd | 165Gd |
| 65 | 153Tb | 165Tb |
| 66 | 154Dy | 165Dy |
| 67 | 155Ho | 165Ho |
| 68 | 156Er | 165Er |
| 69 | 157Tm | 165Tm |
| 70 | 158Yb | 165Yb |
| 71 | 159Lu | 165Lu |
| 72 | 160Hf | 165Hf |
| 73 | 161Ta | 165Ta |
| 74 | 162W | 165W |
| 75 | 163Re | 165Re |
| 76 | 164Os | 165Os |
| 77 | 165Ir | 165Ir |
| 78 | 166Pt | 165Pt |
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/iridium-165m
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