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Thallium-192

Properties and data of the isotope 192Tl.

Contents
General Data
Radioactive Decay
Parent Nuclides
Isotones und Isobares

See also: List of individual Thallium isotopes (and general data sources).

 

General data

Name of the isotope:Thallium-192; Tl-192Symbol:192Tl or 19281TlMass number A:192 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:111Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3703703703704 (= neutron-proton ratio)Neutron excess (N-Z):30Isotopic mass:191.97222(3) u (atomic weight of Thallium-192)Nuclide mass:191.92779 u (calculated nuclear mass without electrons)Mass excess:-25.8769 MeVMass defect:1.623413268 u (per nucleus)Nuclear binding energy:1512.19971866 MeV (per nucleus)
7.8760402 MeV (average binding energy per nucleon)Separation energy:SN = 7.66(3) MeV (first neutron)
SP = 2.47(4) MeV (first proton)Half-life:9.6(4) minDecay constant λ:0.0012033805218055 s-1Specific activity α:3.794202623254 × 10+18 Bq g-1
102546016.84472 Ci g-1Spin and parity:
(nuclear angular momentum)(2-)Magnetic dipole moment:μ(μN) = + 0.200(3)Quadrupole moment Q:- 0.335(11) barn (100 fm2)Nuclear g-factor:gl = 0.1Charge radius:5.4191(51) femtometer fmYear of discovery:1961

 

Radioactive Decay

Half-life T½ = 9.6(4) min (minutes) respectively 5.76 × 102 seconds s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+192Hg100 %6.14(4) MeV

 

Parent Nuclides

Direct parent isotopes are: 196Bi, 192Pb.

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
192m1Tl138(45) keV10.8(2) min(7+)
192m2Tl388(45) keV296(5) ns(8-)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 111) and isobaric (same nucleon number A = 192) with Thallium-192. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 111Isobar A = 192
70181Yb
71182Lu
72183Hf
73184Ta192Ta
74185W192W
75186Re192Re
76187Os192Os
77188Ir192Ir
78189Pt192Pt
79190Au192Au
80191Hg192Hg
81192Tl192Tl
82193Pb192Pb
83194Bi192Bi
84195Po192Po
85196At192At
86197Rn

 

External data and identifiers

Adopted Levels, Gammas:NuDat 192Tl

 

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Last update: 2020-10-22

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