Thallium-190
Properties and data of the isotope 190Tl.
See also: List of individual Thallium isotopes (and general data sources).
General data
Name of the isotope:Thallium-190; Tl-190Symbol:190Tl or 19081TlMass 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:+x keVIsotopic mass:189.973836(9) u (atomic weight of Thallium-190)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)Separation energy:SN = 7.827(12) MeV (first neutron)
SP = 2.03(3) MeV (first proton)Half-life:2.6(3) minDecay constant λ:0.0044432511574355 s-1Specific activity α:1.415761076516 × 10+19 Bq g-1
382638128.78814 Ci g-1Spin and parity:
(nuclear angular momentum)2(-)Magnetic dipole moment:μ(μN) = + 0.254(2)Quadrupole moment Q:- 0.329(9) barn (100 fm2)Nuclear g-factor:gl = 0.127Charge radius:5.4121(56) femtometer fmYear of discovery:1970
Radioactive Decay
Half-life T½ = 2.6(3) min (minutes) respectively 1.56 × 102 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 190Hg | 100 % | 6.999(18) MeV | |
Parent Nuclides
Direct parent isotopes are: 194Bi, 190Pb.
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 |
|---|
| 190m1Tl | +y keV | 3.7(3) min | 7(+) |
| 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-190. 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 | |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/thallium-190
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