Thulium-166
Properties and data of the isotope 166Tm.
See also: List of individual Thulium isotopes (and general data sources).
General data
Name of the isotope:Thulium-166; Tm-166Symbol:166Tm or 16669TmMass number A:166 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:97Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4057971014493 (= neutron-proton ratio)Neutron excess (N-Z):28Isotopic mass:165.933560(12) u (atomic weight of Thulium-166)Nuclide mass:165.8957114 u (calculated nuclear mass without electrons)Mass excess:-61.88846 MeVMass defect:1.44686406 u (per nucleus)Nuclear binding energy:1347.74519071 MeV (per nucleus)
8.11894693 MeV (average binding energy per nucleon)Separation energy:SN = 7.030(12) MeV (first neutron)
SP = 4.656(12) MeV (first proton)Half-life:7.70(3) hDecay constant λ:2.50053095440 × 10-5 s-1Specific activity α:9.126393716384 × 10+16 Bq g-1
2466592.8963202 Ci g-1Spin and parity:
(nuclear angular momentum)2+Magnetic dipole moment:μ(μN) = + 0.0926(7)Quadrupole moment Q:+ 2.14(3) barn (100 fm2)Nuclear g-factor:gl = 0.0463Charge radius:5.2046(38) femtometer fmYear of discovery:1948
Radioactive Decay
Half-life T½ = 7.70(3) h (hours) respectively 2.7720 × 104 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 166Er | 100 % | 3.038(12) MeV | |
Parent Nuclides
Direct parent isotope is: 166Yb.
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 |
|---|
| 166mTm | 109+x keV | 340(25) ms | (6-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 166) with Thulium-166. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 97 | Isobar A = 166 |
|---|
| 56 | 153Ba | |
| 57 | 154La | |
| 58 | 155Ce | |
| 59 | 156Pr | |
| 60 | 157Nd | |
| 61 | 158Pm | |
| 62 | 159Sm | 166Sm |
| 63 | 160Eu | 166Eu |
| 64 | 161Gd | 166Gd |
| 65 | 162Tb | 166Tb |
| 66 | 163Dy | 166Dy |
| 67 | 164Ho | 166Ho |
| 68 | 165Er | 166Er |
| 69 | 166Tm | 166Tm |
| 70 | 167Yb | 166Yb |
| 71 | 168Lu | 166Lu |
| 72 | 169Hf | 166Hf |
| 73 | 170Ta | 166Ta |
| 74 | 171W | 166W |
| 75 | 172Re | 166Re |
| 76 | 173Os | 166Os |
| 77 | 174Ir | 166Ir |
| 78 | 175Pt | 166Pt |
| 79 | 176Au | |
| 80 | 177Hg | |
| 81 | 178Tl | |
| 82 | 179Pb | |
External data and identifiers
Last update: 2020-10-11
Perma link: https://www.chemlin.org/isotope/thulium-166
© 1996 - 2026 ChemLin
