Gold-172m
Properties and data of the isotope 172Au.
See also: list of Gold isotopes.
General data
Name of the isotope:Gold-172m; Au-172mSymbol:172Au or 17279AuMass number A:172 (= number of nucleons)Atomic number Z:79 (= number of protons)Neutrons N:93Isotopic mass:171.99000(6) u (atomic weight of Gold-172m)
Excitation energy: +x keVNuclide mass:171.9466669 u (calculated nuclear mass without electrons)Mass excess:-9.31494 MeVMass defect:1.434014716 u (per nucleus)Nuclear binding energy:1335.77610387 MeV (per nucleus)
7.76614014 MeV (average binding energy per nucleon)Half-life:7.7(14) sDecay constant λ:0.090019114358434 s-1Specific activity α:3.170220975165 × 10+20 Bq g-1
8568164797.7438 Ci g-1Spin and parity:
(nuclear angular momentum)
Radioactive Decay
Half-life T½ = 7.7(14) s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 168Ir | ca. 100 % | | |
p | 171Pt | < 0.02 % | | |
EE/β+ | 172Pt | ? | | |
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 |
---|
172Au | | 22 ms | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 172) with Gold-172m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 93 | Isobar A = 172 |
54 | 147Xe | |
55 | 148Cs | |
56 | 149Ba | |
57 | 150La | |
58 | 151Ce | |
59 | 152Pr | |
60 | 153Nd | |
61 | 154Pm | |
62 | 155Sm | |
63 | 156Eu | |
64 | 157Gd | |
65 | 158Tb | 172Tb |
66 | 159Dy | 172Dy |
67 | 160Ho | 172Ho |
68 | 161Er | 172Er |
69 | 162Tm | 172Tm |
70 | 163Yb | 172Yb |
71 | 164Lu | 172Lu |
72 | 165Hf | 172Hf |
73 | 166Ta | 172Ta |
74 | 167W | 172W |
75 | 168Re | 172Re |
76 | 169Os | 172Os |
77 | 170Ir | 172Ir |
78 | 171Pt | 172Pt |
79 | 172Au | 172Au |
80 | 173Hg | 172Hg |
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/gold-172m
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