Thallium-194
Properties and data of the isotope 194Tl.
See also: List of individual Thallium isotopes (and general data sources).
General data
Name of the isotope:Thallium-194; Tl-194Symbol:194Tl or 19481TlMass number A:194 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:113Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3950617283951 (= neutron-proton ratio)Neutron excess (N-Z):32Isotopic mass:193.971081(15) u (atomic weight of Thallium-194)Nuclide mass:193.926651 u (calculated nuclear mass without electrons)Mass excess:-26.93787 MeVMass defect:1.6418821 u (per nucleus)Nuclear binding energy:1529.40332486 MeV (per nucleus)
7.88352229 MeV (average binding energy per nucleon)Separation energy:SN = 7.532(15) MeV (first neutron)
SP = 3.164(21) MeV (first proton)Half-life:33.0(5) minDecay constant λ:0.00035007433361613 s-1Specific activity α:1.092330025121 × 10+18 Bq g-1
29522433.111397 Ci g-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μN) = 0.140(3)Quadrupole moment Q:- 0.282(7) barn (100 fm2)Nuclear g-factor:gl = 0.07Charge radius:5.4259(46) femtometer fmYear of discovery:1960
Radioactive Decay
Half-life T½ = 33.0(5) min (minutes) respectively 1.980 × 103 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 194Hg | > 99 % | 5.246(14) MeV | |
| α | 190Au | trace | 3.471(14) MeV | |
Parent Nuclides
Direct parent isotope is: 194Pb.
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 |
|---|
| 194mTl | +x keV | 32.8(2) min | (7+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 113) and isobaric (same nucleon number A = 194) with Thallium-194. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 113 | Isobar A = 194 |
|---|
| 70 | 183Yb | |
| 71 | 184Lu | |
| 72 | 185Hf | |
| 73 | 186Ta | 194Ta |
| 74 | 187W | 194W |
| 75 | 188Re | 194Re |
| 76 | 189Os | 194Os |
| 77 | 190Ir | 194Ir |
| 78 | 191Pt | 194Pt |
| 79 | 192Au | 194Au |
| 80 | 193Hg | 194Hg |
| 81 | 194Tl | 194Tl |
| 82 | 195Pb | 194Pb |
| 83 | 196Bi | 194Bi |
| 84 | 197Po | 194Po |
| 85 | 198At | 194At |
| 86 | 199Rn | 194Rn |
| 87 | 200Fr | |
| 88 | 201Ra | |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/thallium-194
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