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Thallium-203

Properties and data of the isotope 203Tl.

Contents
General Data
Parent Nuclides
NMR Data
Isotones und Isobares

See also: list of Thallium isotopes.

 

General data

Name of the isotope:Thallium-203; Tl-203Symbol:203Tl or 20381TlMass number A:203 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:122Isotopic mass:202.972345(9) u (atomic weight of Thallium-203)Nuclide mass:202.927915 u (calculated nuclear mass without electrons)Mass excess:-25.76047 MeVMass defect:1.718602344 u (per nucleus)Nuclear binding energy:1600.86777182 MeV (per nucleus)
7.88604814 MeV (average binding energy per nucleon)Separation energy:SN = 7.8525(15) MeV (first neutron)
SP = 5.7050(11) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2+Magnetic dipole moment:μ(μN) = + 1.62225787(12)Charge radius:5.4666(27) femtometer fmYear of discovery:1931

 

Parent Nuclides

Direct parent isotopes are: 203Pb, 203Hg.

 

Occurrence

Comparison of the natural Thallium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Thallium
Isotopic mixture		204.38 u100 %
Isotope 203Tl202.972345(9) u29.52(1) %
[29.44 - 29.59 %]		stable1/2+
Isotope 205Tl204.974428(9) u70.48(1) %
[70.41 - 70.56 %]		stable1/2+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 203Tl

Isotope:203Tl-NMRQuantity:29.52(1) % [29.44 - 29.59 %]Spin:1/2+Nuclearmagnetic moment
μ/μN:+ 1.62225787(12)Gyromagnetic ratio γ:15.5394 · 107 rad T-1 s-1Nuclear g-factor:gl = 3.24451574Resonance frequency:v0 = 24.7316 at 1 TRelative Sensitivity:0.19598 (H0 = const.)
0.5809 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 122) and isobaric (same nucleon number A = 203) with Thallium-203. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 122Isobar A = 203
74196W
75197Re
76198Os203Os
77199Ir203Ir
78200Pt203Pt
79201Au203Au
80202Hg203Hg
81203Tl203Tl
82204Pb203Pb
83205Bi203Bi
84206Po203Po
85207At203At
86208Rn203Rn
87209Fr203Fr
88210Ra203Ra
89211Ac203Ac
90212Th
91213Pa
92214U

 

External data and identifiers

Adopted Levels, Gammas:NuDat 203Tl

 

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Last update: 2020-10-22

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