Terbium-154
Properties and data of the isotope 154Tb.
See also: List of individual Terbium isotopes (and general data sources).
General data
Name of the isotope:Terbium-154; Tb-154Symbol:154Tb or 15465TbMass number A:154 (= number of nucleons)Atomic number Z:65 (= number of protons)Neutrons N:89Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3692307692308 (= neutron-proton ratio)Neutron excess (N-Z):24Isotopic mass:153.92468(5) u (atomic weight of Terbium-154)Nuclide mass:153.8890253 u (calculated nuclear mass without electrons)Mass excess:-70.16013 MeVMass defect:1.355124604 u (per nucleus)Nuclear binding energy:1262.29043788 MeV (per nucleus)
8.19669116 MeV (average binding energy per nucleon)Separation energy:SN = 6.91(5) MeV (first neutron)
SP = 4.56(5) MeV (first proton)Half-life:21.5(4) hDecay constant λ:8.955389929715 × 10-6 s-1Specific activity α:3.524877098849 × 10+16 Bq g-1
952669.48617565 Ci g-1Spin and parity:
(nuclear angular momentum)0Charge radius:5.0333 femtometer fmYear of discovery:1950
Radioactive Decay
Half-life T½ = 21.5(4) h (hours) respectively 7.7400 × 104 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 154Gd | 99.9 % | 3.55(5) MeV | |
| β- | 154Dy | 0.1 % | 0.24(5) 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 |
|---|
| 154m1Tb | +x keV | 9.4(4) h | 3- |
| 154m2Tb | | 22.7(5) h | 7- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 89) and isobaric (same nucleon number A = 154) with Terbium-154. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 89 | Isobar A = 154 |
|---|
| 50 | 139Sn | |
| 51 | 140Sb | |
| 52 | 141Te | |
| 53 | 142I | |
| 54 | 143Xe | |
| 55 | 144Cs | |
| 56 | 145Ba | 154Ba |
| 57 | 146La | 154La |
| 58 | 147Ce | 154Ce |
| 59 | 148Pr | 154Pr |
| 60 | 149Nd | 154Nd |
| 61 | 150Pm | 154Pm |
| 62 | 151Sm | 154Sm |
| 63 | 152Eu | 154Eu |
| 64 | 153Gd | 154Gd |
| 65 | 154Tb | 154Tb |
| 66 | 155Dy | 154Dy |
| 67 | 156Ho | 154Ho |
| 68 | 157Er | 154Er |
| 69 | 158Tm | 154Tm |
| 70 | 159Yb | 154Yb |
| 71 | 160Lu | 154Lu |
| 72 | 161Hf | 154Hf |
| 73 | 162Ta | |
| 74 | 163W | |
| 75 | 164Re | |
| 76 | 165Os | |
| 77 | 166Ir | |
| 78 | 167Pt | |
External data and identifiers
Last update: 2020-10-08
Perma link: https://www.chemlin.org/isotope/terbium-154
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