Thallium-190m1
Properties and data of the isotope 190m1Tl.
See also: List of individual Thallium isotopes (and general data sources).
General data
Name of the isotope:Thallium-190m1; Tl-190m1Symbol:190m1Tl or 190m181TlMass number A:190 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:109Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3456790123457 (= neutron-proton ratio)Neutron excess (N-Z):28Excitation energy:+y keVIsotopic mass:189.973836(9) u (atomic weight of Thallium-190m1)Nuclide mass:189.929406 u (calculated nuclear mass without electrons)Mass excess:-24.37161 MeVMass defect:1.604467436 u (per nucleus)Nuclear binding energy:1494.55178983 MeV (per nucleus)
7.86606205 MeV (average binding energy per nucleon)Half-life:3.7(3) minDecay constant λ:0.0031222845971169 s-1Specific activity α:9.948591348491 × 10+18 Bq g-1
268880847.25652 Ci g-1Spin and parity:
(nuclear angular momentum)7(+)Magnetic dipole moment:μ(μN) = + 0.487(8)Quadrupole moment Q:+ 0.285(14) barn (100 fm2)Nuclear g-factor:gl = 0.069571428571429
Radioactive Decay
Half-life T½ = 3.7(3) min (minutes) respectively 2.22 × 102 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 190Hg | 100 % | | |
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 |
|---|
| 190Tl | +x keV | 2.6(3) min | 2(-) |
| 190m2Tl | 161.9+y keV | 0.75(4) ms | (8-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 109) and isobaric (same nucleon number A = 190) with Thallium-190m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 109 | Isobar A = 190 |
|---|
| 68 | 177Er | |
| 69 | 178Tm | |
| 70 | 179Yb | |
| 71 | 180Lu | |
| 72 | 181Hf | 190Hf |
| 73 | 182Ta | 190Ta |
| 74 | 183W | 190W |
| 75 | 184Re | 190Re |
| 76 | 185Os | 190Os |
| 77 | 186Ir | 190Ir |
| 78 | 187Pt | 190Pt |
| 79 | 188Au | 190Au |
| 80 | 189Hg | 190Hg |
| 81 | 190Tl | 190Tl |
| 82 | 191Pb | 190Pb |
| 83 | 192Bi | 190Bi |
| 84 | 193Po | 190Po |
| 85 | 194At | 190At |
| 86 | 195Rn | |
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/thallium-190m1
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