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Rhenium-172m

Properties and data of the isotope 172Re.


Content

See also: list of Rhenium isotopes.

 

General data

Name of the isotope:Rhenium-172m; Re-172mSymbol:172Re or 17275ReMass number A:172 (= number of nucleons)Atomic number Z:75 (= number of protons)Neutrons N:97Isotopic mass:171.95541(4) u (atomic weight of Rhenium-172m)
Excitation energy: +x keV
Nuclide mass:171.9142707 u (calculated nuclear mass without electrons)Mass excess:-41.53532 MeVMass defect:1.471964252 u (per nucleus)Nuclear binding energy:1371.12586895 MeV (per nucleus)
7.97166203 MeV (average binding energy per nucleon)
Half-life:55(5) sDecay constant λ:0.012602676010181 s-1Specific activity α:4.438309365231 × 10+19 Bq g-1
1199543071.6841 Ci g-1
Spin and parity:
(nuclear angular momentum)
(2)

 

Radioactive Decay

Half-life T½ = 55(5) s respectively 5.5 × 101 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE/β+172W100 %

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
172Re15(3) s(5+)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 172) with Rhenium-172m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 97Isobar A = 172
56153Ba
57154La
58155Ce
59156Pr
60157Nd
61158Pm
62159Sm
63160Eu
64161Gd
65162Tb172Tb
66163Dy172Dy
67164Ho172Ho
68165Er172Er
69166Tm172Tm
70167Yb172Yb
71168Lu172Lu
72169Hf172Hf
73170Ta172Ta
74171W172W
75172Re172Re
76173Os172Os
77174Ir172Ir
78175Pt172Pt
79176Au172Au
80177Hg172Hg
81178Tl
82179Pb

 


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Last update: 2020-10-21


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