← Back to element: Iridium
EN ▾

Isotope: Iridium-167

General data

Element nameIridium
Chemical symbolIr
Atomic number Z77
Isotope name (symbol)Iridium-167 (Ir-167)
Neutron number N90
Mass number A=Z+N167

Ground state

Half-life30.0 ± 0.9 ms
Spin / Parity1/2+
Mass excess-17072 ± 18 keV

Decay branches

α 44 ± 2% EC/β⁺ 17 ± 3% p 39.0 ± 1.5%

Isomers

IsomerEnergyHalf-lifeSpin / ParityDecay branches
Isomer 1175.3 ± 2.2 keV28.6 ± 0.9 ms11/2-α 89 ± 3% EC/β⁺ 10 ± 3% p 0.41 ± 0.06%
Open Decay Simulator

Produced by decay of

Parent isotopeHalf-lifeDecay% of parent decays
Gold-171m (Au-171m)1.04 msα60.0%

The table shows only radioactive decays that lead directly to this isotope (NNDC data). The percentage is the share of that decay among all decays of the parent isotope, not the share in producing this isotope - that depends on how much of the parent is in the sample. Many isotopes are also produced, often mainly, in nuclear reactions (e.g. Co-60 from Co-59 by neutron capture, C-14 from nitrogen-14 in the atmosphere) and in fission (e.g. Cs-137, I-131) - those routes are not listed here.

Radioactive decay series

Showing 60 of 88 nuclides in the series.

Decay notation

NotationNameOn the chartDescription
αalpha decayAlpha decay is the emission of a helium nucleus (2 protons + 2 neutrons): Z−2, A−4.
β⁻, 2β⁻beta-minus decayIn beta-minus decay a neutron turns into a proton and the nucleus emits an electron: Z+1, A unchanged. 2β⁻ is double beta decay.
EC, EC/β⁺electron capture / beta-plus decayA proton turns into a neutron: the nucleus captures a shell electron (EC) or emits a positron (β⁺): Z−1, A unchanged.
p, 2p, 3pproton emissionProton emission is the ejection of a proton from the nucleus: Z−1, A−1. 2p, 3p - two, three protons.
n, 2n…4nneutron emissionNeutron emission is the ejection of a neutron from the nucleus: A−1, Z unchanged. 2n…4n - several neutrons.
¹⁴C, ²⁴Ne…cluster emissionCluster emission is the ejection of a light nucleus, e.g. ¹⁴C, ²⁰O, ²⁴Ne, ²⁸Mg, ³⁴Si. It is a very rare transformation.
ITisomeric transitionAn isomeric transition takes a nucleus from an excited state (an isomer, e.g. Pa-234m) to the ground state, usually emitting a γ photon: Z and A unchanged.
β⁻n, ECp, ECα…delayed emission Delayed emission is the emission of a particle (n, p or α) right after β⁻ decay or electron capture. The arrow has the colour of the emitted particle and its label shows the transformation, e.g. “β⁻n 63%”.
SFspontaneous fissionno arrowSpontaneous fission is the splitting of a nucleus into two fragments of random masses. There is no single daughter, so the chart shows no arrow - it is listed in the decay branches and in the tile tooltip.

Data sources

More about the data sources