Thallium-190m2
Properties and data of the isotope 190Tl.
See also: list of Thallium isotopes.
General data
Name of the isotope:Thallium-190m2; Tl-190m2Symbol:190Tl or 19081TlMass number A:190 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:109Isotopic mass:189.973836(9) u (atomic weight of Thallium-190m2)
Excitation energy: 161.9+y keVNuclide 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:0.75(4) msDecay constant λ:924.19624074659 s-1Specific activity α:2.944783039153 × 10+24 Bq g-1
79588730787930 Ci g-1Spin and parity:
(nuclear angular momentum)(8-)
Radioactive Decay
Half-life T½ = 0.75(4) ms respectively 7.5 × 10-4 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 190Tl | 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(-) |
190m1Tl | +y keV | 3.7(3) min | 7(+) |
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-190m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | 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-190m2
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