Thallium-193m

Properties and data of the isotope ^193mTl.

Contents

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

General data

Name of the isotope:Thallium-193m; Tl-193mSymbol:^193mTl or 193m81TlMass number A:193 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:112Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.3827160493827 (= neutron-proton ratio)Neutron excess (N-Z):31Excitation energy:365.2+x keVIsotopic mass:192.970502(7) u (atomic weight of Thallium-193m)Nuclide mass:192.926072 u (calculated nuclear mass without electrons)Mass excess:-27.47721 MeVMass defect:1.633796184 u (per nucleus)Nuclear binding energy:1521.87134262 MeV (per nucleus)
7.88534374 MeV (average binding energy per nucleon)Half-life:2.11(15) minDecay constant λ:0.0054750962129538 s^-1Specific activity α:1.717281282089 × 10⁺¹⁹ Bq g^-1
464130076.24035 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2-)Magnetic dipole moment:μ(μ_N) = + 3.948(4)Quadrupole moment Q:- 2.20(2) barn (100 fm²)Nuclear g-factor:g_l = 0.87733333333333

Radioactive Decay

Half-life T_½ = 2.11(15) min (minutes) respectively 1.266 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁹³Hg	≥ 25 %
Iso	¹⁹³Tl	≤ 75 %

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
¹⁹³Tl		21.6(8) min	1/2(+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 112) and isobaric (same nucleon number A = 193) with Thallium-193m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 112	Isobar A = 193
70	¹⁸²Yb
71	¹⁸³Lu
72	¹⁸⁴Hf
73	¹⁸⁵Ta	¹⁹³Ta
74	¹⁸⁶W	¹⁹³W
75	¹⁸⁷Re	¹⁹³Re
76	¹⁸⁸Os	¹⁹³Os
77	¹⁸⁹Ir	¹⁹³Ir
78	¹⁹⁰Pt	¹⁹³Pt
79	¹⁹¹Au	¹⁹³Au
80	¹⁹²Hg	¹⁹³Hg
81	¹⁹³Tl	¹⁹³Tl
82	¹⁹⁴Pb	¹⁹³Pb
83	¹⁹⁵Bi	¹⁹³Bi
84	¹⁹⁶Po	¹⁹³Po
85	¹⁹⁷At	¹⁹³At
86	¹⁹⁸Rn	¹⁹³Rn
87	¹⁹⁹Fr