Thallium-180

Properties and data of the isotope ¹⁸⁰Tl.

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-180; Tl-180Symbol:¹⁸⁰Tl or 18081TlMass number A:180 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:99Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.2222222222222 (= neutron-proton ratio)Neutron excess (N-Z):18Isotopic mass:179.98992(6) u (atomic weight of Thallium-180)Nuclide mass:179.94549 u (calculated nuclear mass without electrons)Mass excess:-9.38946 MeVMass defect:1.501734276 u (per nucleus)Nuclear binding energy:1398.85646769 MeV (per nucleus)
7.77142482 MeV (average binding energy per nucleon)Separation energy:S_N = 9.19(7) MeV (first neutron)Half-life:1.09(1) sDecay constant λ:0.63591484455041 s^-1Specific activity α:2.139423893188 × 10⁺²¹ Bq g^-1
57822267383.473 Ci g^-1Spin and parity:
(nuclear angular momentum)(5-)Year of discovery:1987

Radioactive Decay

Half-life T_½ = 1.09(1) s.

Decay mode	Daughter	Probability	Decay energy
α	¹⁷⁶Au	6(4) %	6.71(5) MeV
EC/β⁺	¹⁸⁰Hg	94(4) %	10.86(6) MeV
EC, SF	div	0.0032(2) %

Parent Nuclides

Direct parent isotope is: ¹⁸⁴Bi.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 180) with Thallium-180. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 99	Isobar A = 180
57	¹⁵⁶La
58	¹⁵⁷Ce
59	¹⁵⁸Pr
60	¹⁵⁹Nd
61	¹⁶⁰Pm
62	¹⁶¹Sm
63	¹⁶²Eu
64	¹⁶³Gd
65	¹⁶⁴Tb
66	¹⁶⁵Dy
67	¹⁶⁶Ho
68	¹⁶⁷Er
69	¹⁶⁸Tm
70	¹⁶⁹Yb	¹⁸⁰Yb
71	¹⁷⁰Lu	¹⁸⁰Lu
72	¹⁷¹Hf	¹⁸⁰Hf
73	¹⁷²Ta	¹⁸⁰Ta
74	¹⁷³W	¹⁸⁰W
75	¹⁷⁴Re	¹⁸⁰Re
76	¹⁷⁵Os	¹⁸⁰Os
77	¹⁷⁶Ir	¹⁸⁰Ir
78	¹⁷⁷Pt	¹⁸⁰Pt
79	¹⁷⁸Au	¹⁸⁰Au
80	¹⁷⁹Hg	¹⁸⁰Hg
81	¹⁸⁰Tl	¹⁸⁰Tl
82	¹⁸¹Pb	¹⁸⁰Pb