Thulium-154m
Properties and data of the isotope 154mTm.
See also: List of individual Thulium isotopes (and general data sources).
General data
Name of the isotope:Thulium-154m; Tm-154mSymbol:154mTm or 154m69TmMass number A:154 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:85Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.231884057971 (= neutron-proton ratio)Neutron excess (N-Z):16Excitation energy:70(50) keVIsotopic mass:153.941570(15) u (atomic weight of Thulium-154m)Nuclide mass:153.9037214 u (calculated nuclear mass without electrons)Mass excess:-54.42719 MeVMass defect:1.334875068 u (per nucleus)Nuclear binding energy:1243.42811659 MeV (per nucleus)
8.07420855 MeV (average binding energy per nucleon)Half-life:3.30(7) sDecay constant λ:0.21004460016968 s-1Specific activity α:8.267439013666 × 10+20 Bq g-1
22344429766.665 Ci g-1Spin and parity:
(nuclear angular momentum)9+Magnetic dipole moment:μ(μN) = +5.91(5)Quadrupole moment Q:-0.002(4) barn (100 fm2)Nuclear g-factor:gl = 0.65666666666667
Radioactive Decay
Half-life T½ = 3.30(7) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 150Ho | 58(5) % | | |
| EC/β+ | 154Er | 42(5) % | | |
| Iso | 154Tm | ? | | |
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 |
|---|
| 154Tm | | 8.1(3) s | (2-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 154) with Thulium-154m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 85 | Isobar A = 154 |
|---|
| 47 | 132Ag | |
| 48 | 133Cd | |
| 49 | 134In | |
| 50 | 135Sn | |
| 51 | 136Sb | |
| 52 | 137Te | |
| 53 | 138I | |
| 54 | 139Xe | |
| 55 | 140Cs | |
| 56 | 141Ba | |
| 57 | 142La | 154La |
| 58 | 143Ce | 154Ce |
| 59 | 144Pr | 154Pr |
| 60 | 145Nd | 154Nd |
| 61 | 146Pm | 154Pm |
| 62 | 147Sm | 154Sm |
| 63 | 148Eu | 154Eu |
| 64 | 149Gd | 154Gd |
| 65 | 150Tb | 154Tb |
| 66 | 151Dy | 154Dy |
| 67 | 152Ho | 154Ho |
| 68 | 153Er | 154Er |
| 69 | 154Tm | 154Tm |
| 70 | 155Yb | 154Yb |
| 71 | 156Lu | 154Lu |
| 72 | 157Hf | 154Hf |
| 73 | 158Ta | |
| 74 | 159W | |
| 75 | 160Re | |
| 76 | 161Os | |
Last update: 2020-10-10
Perma link: https://www.chemlin.org/isotope/thulium-154m
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