Tantalum-182

Properties and data of the isotope ¹⁸²Ta.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Tantalum-182; Ta-182Symbol:¹⁸²Ta or 18273TaMass number A:182 (= number of nucleons)Atomic number Z:73 (= number of protons)Neutrons N:109Isotopic mass:181.9501554(15) u (atomic weight of Tantalum-182)Nuclide mass:181.910113 u (calculated nuclear mass without electrons)Mass excess:-46.42995 MeVMass defect:1.56554778 u (per nucleus)Nuclear binding energy:1458.29836378 MeV (per nucleus)
8.01262837 MeV (average binding energy per nucleon)Separation energy:S_N = 6.06294(11) MeV (first neutron)
S_P = 6.3161(18) MeV (first proton)Half-life:114.74(12) dDecay constant λ:6.991926801495 × 10^-8 s^-1Specific activity α:2.326318678506 × 10⁺¹⁴ Bq g^-1
6287.3477797484 Ci g^-1Spin and parity:
(nuclear angular momentum)3-Magnetic dipole moment:μ(μ_N) = (+) 3.02(3)Quadrupole moment Q:+ 2.60 barn (100 fm²)Year of discovery:1938

Radioactive Decay

Half-life T_½ = 114.74(12) d respectively 9.913536 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁸²W	100 %	1.8161(14) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸²Hf.

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
^182mTa	16.273(4) keV	283(3) ms	5+
^182m2Ta	519.577(16) keV	15.84(10) min	10-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 109) and isobaric (same nucleon number A = 182) with Tantalum-182. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 109	Isobar A = 182
68	¹⁷⁷Er
69	¹⁷⁸Tm
70	¹⁷⁹Yb	¹⁸²Yb
71	¹⁸⁰Lu	¹⁸²Lu
72	¹⁸¹Hf	¹⁸²Hf
73	¹⁸²Ta	¹⁸²Ta
74	¹⁸³W	¹⁸²W
75	¹⁸⁴Re	¹⁸²Re
76	¹⁸⁵Os	¹⁸²Os
77	¹⁸⁶Ir	¹⁸²Ir
78	¹⁸⁷Pt	¹⁸²Pt
79	¹⁸⁸Au	¹⁸²Au
80	¹⁸⁹Hg	¹⁸²Hg
81	¹⁹⁰Tl	¹⁸²Tl
82	¹⁹¹Pb	¹⁸²Pb
83	¹⁹²Bi
84	¹⁹³Po
85	¹⁹⁴At
86	¹⁹⁵Rn