Thallium-196

Properties and data of the isotope ¹⁹⁶Tl.

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-196; Tl-196Symbol:¹⁹⁶Tl or 19681TlMass number A:196 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:115Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4197530864198 (= neutron-proton ratio)Neutron excess (N-Z):34Isotopic mass:195.970481(13) u (atomic weight of Thallium-196)Nuclide mass:195.926051 u (calculated nuclear mass without electrons)Mass excess:-27.49677 MeVMass defect:1.659811932 u (per nucleus)Nuclear binding energy:1546.10485579 MeV (per nucleus)
7.88829008 MeV (average binding energy per nucleon)Separation energy:S_N = 7.413(16) MeV (first neutron)
S_P = 3.772(26) MeV (first proton)Half-life:1.84(3) hDecay constant λ:0.00010464178450482 s^-1Specific activity α:3.231628544221 × 10⁺¹⁷ Bq g^-1
8734131.2005986 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Charge radius:5.4327(42) femtometer fmYear of discovery:1955

Radioactive Decay

Half-life T_½ = 1.84(3) h (hours) respectively 6.624 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁹⁶Hg	100 %	4.329(12) MeV

Parent Nuclides

Direct parent isotope is: ¹⁹⁶Pb.

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
^196mTl	394.2(5) keV	1.41(2) h	(7+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 115) and isobaric (same nucleon number A = 196) with Thallium-196. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 115	Isobar A = 196
70	¹⁸⁵Yb
71	¹⁸⁶Lu
72	¹⁸⁷Hf
73	¹⁸⁸Ta
74	¹⁸⁹W	¹⁹⁶W
75	¹⁹⁰Re	¹⁹⁶Re
76	¹⁹¹Os	¹⁹⁶Os
77	¹⁹²Ir	¹⁹⁶Ir
78	¹⁹³Pt	¹⁹⁶Pt
79	¹⁹⁴Au	¹⁹⁶Au
80	¹⁹⁵Hg	¹⁹⁶Hg
81	¹⁹⁶Tl	¹⁹⁶Tl
82	¹⁹⁷Pb	¹⁹⁶Pb
83	¹⁹⁸Bi	¹⁹⁶Bi
84	¹⁹⁹Po	¹⁹⁶Po
85	²⁰⁰At	¹⁹⁶At
86	²⁰¹Rn	¹⁹⁶Rn
87	²⁰²Fr
88	²⁰³Ra
89	²⁰⁴Ac