Lutetium-174
Properties and data of the isotope 174Lu.
See also: List of individual Lutetium isotopes (and general data sources).
General data
Name of the isotope:Lutetium-174; Lu-174Symbol:174Lu or 17471LuMass number A:174 (= number of nucleons)Atomic number Z:71 (= number of protons)Neutrons N:103Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4507042253521 (= neutron-proton ratio)Neutron excess (N-Z):32Isotopic mass:173.9403429(17) u (atomic weight of Lutetium-174)Nuclide mass:173.9013974 u (calculated nuclear mass without electrons)Mass excess:-55.57023 MeVMass defect:1.50772072 u (per nucleus)Nuclear binding energy:1404.43280436 MeV (per nucleus)
8.0714529 MeV (average binding energy per nucleon)Separation energy:SN = 6.760(14) MeV (first neutron)
SP = 5.3079(16) MeV (first proton)Half-life:3.31(5) aDecay constant λ:6.640612958037 × 10-9 s-1Specific activity α:23116015392845 Bq g-1
624.75717277959 Ci g-1Spin and parity:
(nuclear angular momentum)(1)-Magnetic dipole moment:μ(μN) = 1.94(28)Nuclear g-factor:gl = 1.94Charge radius:5.3634(303) femtometer fmYear of discovery:1951
Radioactive Decay
Half-life T½ = 3.31(5) a respectively 1.0438 × 108 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 174Yb | 100 % | 1.3743(16) MeV | |
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 |
|---|
| 174m1Lu | 170.83(5) keV | 142(2) d | (6)- |
| 174m2Lu | 240.818(4) keV | 395(15) ns | (3+) |
| 174m3Lu | 365.183(6) keV | 145(3) ns | (4-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 103) and isobaric (same nucleon number A = 174) with Lutetium-174. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 103 | Isobar A = 174 |
|---|
| 60 | 163Nd | |
| 62 | 165Sm | |
| 63 | 166Eu | |
| 64 | 167Gd | |
| 65 | 168Tb | |
| 66 | 169Dy | 174Dy |
| 67 | 170Ho | 174Ho |
| 68 | 171Er | 174Er |
| 69 | 172Tm | 174Tm |
| 70 | 173Yb | 174Yb |
| 71 | 174Lu | 174Lu |
| 72 | 175Hf | 174Hf |
| 73 | 176Ta | 174Ta |
| 74 | 177W | 174W |
| 75 | 178Re | 174Re |
| 76 | 179Os | 174Os |
| 77 | 180Ir | 174Ir |
| 78 | 181Pt | 174Pt |
| 79 | 182Au | 174Au |
| 80 | 183Hg | 174Hg |
| 81 | 184Tl | |
| 82 | 185Pb | |
| 83 | 186Bi | |
| 84 | 187Po | |
| 85 | 188At | |
External data and identifiers
Last update: 2020-10-11
Perma link: https://www.chemlin.org/isotope/lutetium-174
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