Thallium-182

Properties and data of the isotope ¹⁸²Tl.

Contents

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

General data

Name of the isotope:Thallium-182; Tl-182Symbol:¹⁸²Tl or 18281TlMass number A:182 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:101Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.2469135802469 (= neutron-proton ratio)Neutron excess (N-Z):20Isotopic mass:181.985692(13) u (atomic weight of Thallium-182)Nuclide mass:181.941262 u (calculated nuclear mass without electrons)Mass excess:-13.32782 MeVMass defect:1.523292108 u (per nucleus)Nuclear binding energy:1418.93745885 MeV (per nucleus)
7.79635966 MeV (average binding energy per nucleon)Separation energy:S_N = 8.601(15) MeV (first neutron)Half-life:3.1(10) sDecay constant λ:0.22359586469676 s^-1Specific activity α:7.439369021564 × 10⁺²⁰ Bq g^-1
20106402760.986 Ci g^-1Spin and parity:
(nuclear angular momentum)(7+)Year of discovery:1991

Radioactive Decay

Half-life T_½ = 3.1(10) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁷⁸Au	?	6.551(6) MeV
EC/β⁺	¹⁸²Hg	97.5(25) %	10.249(15) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 101) and isobaric (same nucleon number A = 182) with Thallium-182. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 101	Isobar A = 182
58	¹⁵⁹Ce
59	¹⁶⁰Pr
60	¹⁶¹Nd
61	¹⁶²Pm
62	¹⁶³Sm
63	¹⁶⁴Eu
64	¹⁶⁵Gd
65	¹⁶⁶Tb
66	¹⁶⁷Dy
67	¹⁶⁸Ho
68	¹⁶⁹Er
69	¹⁷⁰Tm
70	¹⁷¹Yb	¹⁸²Yb
71	¹⁷²Lu	¹⁸²Lu
72	¹⁷³Hf	¹⁸²Hf
73	¹⁷⁴Ta	¹⁸²Ta
74	¹⁷⁵W	¹⁸²W
75	¹⁷⁶Re	¹⁸²Re
76	¹⁷⁷Os	¹⁸²Os
77	¹⁷⁸Ir	¹⁸²Ir
78	¹⁷⁹Pt	¹⁸²Pt
79	¹⁸⁰Au	¹⁸²Au
80	¹⁸¹Hg	¹⁸²Hg
81	¹⁸²Tl	¹⁸²Tl
82	¹⁸³Pb	¹⁸²Pb
83	¹⁸⁴Bi