Technetium-89

Properties and data of the isotope ⁸⁹Tc.

Contents

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

General data

Name of the isotope:Technetium-89; Tc-89Symbol:⁸⁹Tc or 8943TcMass number A:89 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:46Isotopic mass:88.927649(4) u (atomic weight of Technetium-89)Nuclide mass:88.9040612 u (calculated nuclear mass without electrons)Mass excess:-67.39452 MeVMass defect:0.80741351200001 u (per nucleus)Nuclear binding energy:752.10084195 MeV (per nucleus)
8.45057126 MeV (average binding energy per nucleon)Separation energy:S_N = 13.78(15) MeV (first neutron)
S_P = 1.997(5) MeV (first proton)Half-life:12.8(9) sDecay constant λ:0.054152123481246 s^-1Specific activity α:3.705814948508 × 10⁺²⁰ Bq g^-1
10015716077.05 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)Year of discovery:1991

Radioactive Decay

Half-life T_½ = 12.8(9) s respectively 1.28 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁸⁹Mo	100 %	7.62(5) MeV

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
^89mTc	62.6(5) keV	12.9(8) s	(1/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 46) and isobaric (same nucleon number A = 89) with Technetium-89. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 46	Isobar A = 89
25	⁷¹Mn
26	⁷²Fe
27	⁷³Co
28	⁷⁴Ni
29	⁷⁵Cu
30	⁷⁶Zn
31	⁷⁷Ga
32	⁷⁸Ge	⁸⁹Ge
33	⁷⁹As	⁸⁹As
34	⁸⁰Se	⁸⁹Se
35	⁸¹Br	⁸⁹Br
36	⁸²Kr	⁸⁹Kr
37	⁸³Rb	⁸⁹Rb
38	⁸⁴Sr	⁸⁹Sr
39	⁸⁵Y	⁸⁹Y
40	⁸⁶Zr	⁸⁹Zr
41	⁸⁷Nb	⁸⁹Nb
42	⁸⁸Mo	⁸⁹Mo
43	⁸⁹Tc	⁸⁹Tc
44	⁹⁰Ru	⁸⁹Ru
45	⁹¹Rh	⁸⁹Rh
46	⁹²Pd
47	⁹³Ag
48	⁹⁴Cd