Thallium-192m1

Properties and data of the isotope ^192m1Tl.

Contents

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

General data

Name of the isotope:Thallium-192m1; Tl-192m1Symbol:^192m1Tl or 192m181TlMass 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):30Excitation energy:138(45) keVIsotopic mass:191.97222(3) u (atomic weight of Thallium-192m1)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)Half-life:10.8(2) minDecay constant λ:0.0010696715749382 s^-1Specific activity α:3.372624554004 × 10⁺¹⁸ Bq g^-1
91152014.973089 Ci g^-1Spin and parity:
(nuclear angular momentum)(7+)Magnetic dipole moment:μ(μ_N) = + 0.5180(36)Quadrupole moment Q:+ 0.473(20) barn (100 fm²)Nuclear g-factor:g_l = 0.074

Radioactive Decay

Half-life T_½ = 10.8(2) min (minutes) respectively 6.48 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁹²Hg	100 %

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
¹⁹²Tl		9.6(4) min	(2-)
^192m2Tl	388(45) keV	296(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-192m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 111	Isobar A = 192
70	¹⁸¹Yb
71	¹⁸²Lu
72	¹⁸³Hf
73	¹⁸⁴Ta	¹⁹²Ta
74	¹⁸⁵W	¹⁹²W
75	¹⁸⁶Re	¹⁹²Re
76	¹⁸⁷Os	¹⁹²Os
77	¹⁸⁸Ir	¹⁹²Ir
78	¹⁸⁹Pt	¹⁹²Pt
79	¹⁹⁰Au	¹⁹²Au
80	¹⁹¹Hg	¹⁹²Hg
81	¹⁹²Tl	¹⁹²Tl
82	¹⁹³Pb	¹⁹²Pb
83	¹⁹⁴Bi	¹⁹²Bi
84	¹⁹⁵Po	¹⁹²Po
85	¹⁹⁶At	¹⁹²At
86	¹⁹⁷Rn