Thulium-151
Properties and data of the isotope 151Tm.
See also: list of Thulium isotopes.
General data
Name of the isotope:Thulium-151; Tm-151Symbol:151Tm or 15169TmMass number A:151 (= number of nucleons)Atomic number Z:69 (= number of protons)Neutrons N:82Isotopic mass:150.945493(21) u (atomic weight of Thulium-151)Nuclide mass:150.9076444 u (calculated nuclear mass without electrons)Mass excess:-50.77294 MeVMass defect:1.30495732 u (per nucleus)Nuclear binding energy:1215.55991384 MeV (per nucleus)
8.05006565 MeV (average binding energy per nucleon)Separation energy:SN = 12.35(20) MeV (first neutron)
SP = 0.230(9) MeV (first proton)Half-life:4.17(11) sDecay constant λ:0.16622234545802 s-1Specific activity α:6.673429189448 × 10+20 Bq g-1
18036295106.617 Ci g-1Spin and parity:
(nuclear angular momentum)(11/2-)Year of discovery:1982
Radioactive Decay
Half-life T½ = 4.17(11) s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 151Er | 100 % | 7.494(25) MeV | |
Parent Nuclides
Direct parent isotopes are: 151Yb, 152Lu, 155Lu.
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 |
---|
151m1Tm | +x keV | 6.6(20) s | (1/2+) |
151m2Tm | 2655.67(22) keV | 0.451(34) μs | (27/2-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 151) with Thulium-151. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 82 | Isobar A = 151 |
45 | 127Rh | |
46 | 128Pd | |
47 | 129Ag | |
48 | 130Cd | |
49 | 131In | |
50 | 132Sn | |
51 | 133Sb | |
52 | 134Te | |
53 | 135I | |
54 | 136Xe | |
55 | 137Cs | 151Cs |
56 | 138Ba | 151Ba |
57 | 139La | 151La |
58 | 140Ce | 151Ce |
59 | 141Pr | 151Pr |
60 | 142Nd | 151Nd |
61 | 143Pm | 151Pm |
62 | 144Sm | 151Sm |
63 | 145Eu | 151Eu |
64 | 146Gd | 151Gd |
65 | 147Tb | 151Tb |
66 | 148Dy | 151Dy |
67 | 149Ho | 151Ho |
68 | 150Er | 151Er |
69 | 151Tm | 151Tm |
70 | 152Yb | 151Yb |
71 | 153Lu | 151Lu |
72 | 154Hf | |
73 | 155Ta | |
74 | 156W | |
External data and identifiers
Last update: 2020-10-10
Perma link: https://www.chemlin.org/isotope/thulium-151
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