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Iridium-168

Properties and data of the isotope 168Ir.


Contents

See also: list of Iridium isotopes.

 

General data

Name of the isotope:Iridium-168; Ir-168Symbol:168Ir or 16877IrMass number A:168 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:91Isotopic mass:167.97996(6) u (atomic weight of Iridium-168)Nuclide mass:167.9377238 u (calculated nuclear mass without electrons)Mass excess:-18.66714 MeVMass defect:1.41107482 u (per nucleus)Nuclear binding energy:1314.40772838 MeV (per nucleus)
7.82385553 MeV (average binding energy per nucleon)
Separation energy:SN = 9.67(6) MeV (first neutron)
SP = -0.55(9) MeV (first proton)
Half-life:222 msDecay constant λ:3.1222845971169 s-1Specific activity α:1.125918422074 × 10+22 Bq g-1
304302276236.43 Ci g-1
Spin and parity:
(nuclear angular momentum)
Year of discovery:1978

 

Radioactive Decay

Half-life T½ = 222 ms respectively 2.22 × 10-1 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
α164Re≤ 100 %6.381(9) MeV
p167Os?
EC/β+168Os?11,33(6) MeV

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
168Ir+x keV159 ms

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 168) with Iridium-168. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 91Isobar A = 168
52143Te
53144I
54145Xe
55146Cs
56147Ba
57148La
58149Ce
59150Pr
60151Nd
61152Pm
62153Sm
63154Eu168Eu
64155Gd168Gd
65156Tb168Tb
66157Dy168Dy
67158Ho168Ho
68159Er168Er
69160Tm168Tm
70161Yb168Yb
71162Lu168Lu
72163Hf168Hf
73164Ta168Ta
74165W168W
75166Re168Re
76167Os168Os
77168Ir168Ir
78169Pt168Pt
79170Au
80171Hg

 

External data and identifiers

Adopted Levels, Gammas:NuDat 168Ir

 


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Last update: 2020-10-21


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