Tantalum-182m

Properties and data of the isotope ^182mTa.

Contents

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

General data

Name of the isotope:Tantalum-182m; Ta-182mSymbol:^182mTa or 182m73TaMass number A:182 (= number of nucleons)Atomic number Z:73 (= number of protons)Neutrons N:109Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4931506849315 (= neutron-proton ratio)Neutron excess (N-Z):36Excitation energy:16.273(4) keVIsotopic mass:181.9501554(15) u (atomic weight of Tantalum-182m)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)Half-life:283(3) msDecay constant λ:2.4492833235334 s^-1Specific activity α:8.149132143763 × 10⁺²¹ Bq g^-1
220246814696.31 Ci g^-1Spin and parity:
(nuclear angular momentum)5+

Radioactive Decay

Half-life T_½ = 283(3) ms respectively 2.83 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁸²Ta	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
¹⁸²Ta		114.74(12) d	3-
^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-182m. 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