Tellurium-131m
Properties and data of the isotope 131mTe.
See also: List of individual Tellurium isotopes (and general data sources).
General data
Name of the isotope:Tellurium-131m; Te-131mSymbol:131mTe or 131m52TeMass number A:131 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:79Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.5192307692308 (= neutron-proton ratio)Neutron excess (N-Z):27Excitation energy:182.258(18) keVIsotopic mass:130.90852221(6) u (atomic weight of Tellurium-131m)Nuclide mass:130.8799978 u (calculated nuclear mass without electrons)Mass excess:-85.21101 MeVMass defect:1.182907818 u (per nucleus)Nuclear binding energy:1101.87153502 MeV (per nucleus)
8.41123309 MeV (average binding energy per nucleon)Half-life:33.25(25) hDecay constant λ:5.790703262823 × 10-6 s-1Specific activity α:2.682494671293 × 10+16 Bq g-1
724998.55980908 Ci g-1Spin and parity:
(nuclear angular momentum)11/2-Magnetic dipole moment:μ(μN) = -1.123(7)Nuclear g-factor:gl = -0.20418181818182
Radioactive Decay
Half-life T½ = 33.25(25) h (hours) respectively 1.19700 × 105 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 131I | 74.1(5) % | | |
| Iso | 131Te | 25.9(5) % | | |
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 |
|---|
| 131Te | | 25.0(1) min | 3/2+ |
| 131m2Te | 1940.0(4) keV | 93(12) ms | (23/2+) |
| 131m+Te | | | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 131) with Tellurium-131m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 79 | Isobar A = 131 |
|---|
| 44 | 123Ru | |
| 45 | 124Rh | |
| 46 | 125Pd | |
| 47 | 126Ag | 131Ag |
| 48 | 127Cd | 131Cd |
| 49 | 128In | 131In |
| 50 | 129Sn | 131Sn |
| 51 | 130Sb | 131Sb |
| 52 | 131Te | 131Te |
| 53 | 132I | 131I |
| 54 | 133Xe | 131Xe |
| 55 | 134Cs | 131Cs |
| 56 | 135Ba | 131Ba |
| 57 | 136La | 131La |
| 58 | 137Ce | 131Ce |
| 59 | 138Pr | 131Pr |
| 60 | 139Nd | 131Nd |
| 61 | 140Pm | 131Pm |
| 62 | 141Sm | 131Sm |
| 63 | 142Eu | 131Eu |
| 64 | 143Gd | |
| 65 | 144Tb | |
| 66 | 145Dy | |
| 67 | 146Ho | |
| 68 | 147Er | |
| 69 | 148Tm | |
| 70 | 149Yb | |
| 71 | 150Lu | |
Last update: 2020-10-18
Perma link: https://www.chemlin.org/isotope/tellurium-131m
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