Thulium-168
Properties and data of the isotope 168Tm.
See also: List of individual Thulium isotopes (and general data sources).
General data
Name of the isotope:Thulium-168; Tm-168Symbol:168Tm or 16869TmMass number A:168 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:99Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4347826086957 (= neutron-proton ratio)Neutron excess (N-Z):30Isotopic mass:167.9341779(18) u (atomic weight of Thulium-168)Nuclide mass:167.8963293 u (calculated nuclear mass without electrons)Mass excess:-61.31289 MeVMass defect:1.463575992 u (per nucleus)Nuclear binding energy:1363.31225509 MeV (per nucleus)
8.1149539 MeV (average binding energy per nucleon)Separation energy:SN = 6.8406(18) MeV (first neutron)
SP = 5.3107(19) MeV (first proton)Half-life:93.1(2) dDecay constant λ:8.617117950629 × 10-8 s-1Specific activity α:3.107395096130 × 10+14 Bq g-1
8398.3651246776 Ci g-1Spin and parity:
(nuclear angular momentum)3+Magnetic dipole moment:μ(μN) = + 0.227(11)Quadrupole moment Q:+ 3.23(7) barn (100 fm2)Nuclear g-factor:gl = 0.075666666666667Charge radius:5.2170(36) femtometer fmYear of discovery:1949
Radioactive Decay
Half-life T½ = 93.1(2) d respectively 8.043840 × 106 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 168Er | 99.990(7) % | 1.6782(21) MeV | |
| β- | 168Yb | 0.010(7) % | 0.2690(19) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 168) with Thulium-168. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 99 | Isobar A = 168 |
|---|
| 57 | 156La | |
| 58 | 157Ce | |
| 59 | 158Pr | |
| 60 | 159Nd | |
| 61 | 160Pm | |
| 62 | 161Sm | |
| 63 | 162Eu | 168Eu |
| 64 | 163Gd | 168Gd |
| 65 | 164Tb | 168Tb |
| 66 | 165Dy | 168Dy |
| 67 | 166Ho | 168Ho |
| 68 | 167Er | 168Er |
| 69 | 168Tm | 168Tm |
| 70 | 169Yb | 168Yb |
| 71 | 170Lu | 168Lu |
| 72 | 171Hf | 168Hf |
| 73 | 172Ta | 168Ta |
| 74 | 173W | 168W |
| 75 | 174Re | 168Re |
| 76 | 175Os | 168Os |
| 77 | 176Ir | 168Ir |
| 78 | 177Pt | 168Pt |
| 79 | 178Au | |
| 80 | 179Hg | |
| 81 | 180Tl | |
| 82 | 181Pb | |
External data and identifiers
Last update: 2020-10-11
Perma link: https://www.chemlin.org/isotope/thulium-168
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