Technetium-90m

Properties and data of the isotope ^90mTc.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Technetium-90m; Tc-90mSymbol:^90mTc or 90m43TcMass number A:90 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:47Isotopic mass:89.9240739(11) u (atomic weight of Technetium-90m)
Excitation energy: 144.1(17) keVNuclide mass:89.9004861 u (calculated nuclear mass without electrons)Mass excess:-70.72471 MeVMass defect:0.819653528 u (per nucleus)Nuclear binding energy:763.50234341 MeV (per nucleus)
8.48335937 MeV (average binding energy per nucleon)Half-life:8.7(2) sDecay constant λ:0.079672089719534 s^-1Specific activity α:5.390972437039 × 10⁺²⁰ Bq g^-1
14570195775.784 Ci g^-1Spin and parity:
(nuclear angular momentum)1+

Radioactive Decay

Half-life T_½ = 8.7(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁹⁰Mo	100 %

Parent Nuclides

Direct parent isotope is: ⁹⁰Ru.

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
⁹⁰Tc		49.2(4) s	(8+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 47) and isobaric (same nucleon number A = 90) with Technetium-90m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 47	Isobar A = 90
26	⁷³Fe
27	⁷⁴Co
28	⁷⁵Ni
29	⁷⁶Cu
30	⁷⁷Zn
31	⁷⁸Ga
32	⁷⁹Ge	⁹⁰Ge
33	⁸⁰As	⁹⁰As
34	⁸¹Se	⁹⁰Se
35	⁸²Br	⁹⁰Br
36	⁸³Kr	⁹⁰Kr
37	⁸⁴Rb	⁹⁰Rb
38	⁸⁵Sr	⁹⁰Sr
39	⁸⁶Y	⁹⁰Y
40	⁸⁷Zr	⁹⁰Zr
41	⁸⁸Nb	⁹⁰Nb
42	⁸⁹Mo	⁹⁰Mo
43	⁹⁰Tc	⁹⁰Tc
44	⁹¹Ru	⁹⁰Ru
45	⁹²Rh	⁹⁰Rh
46	⁹³Pd	⁹⁰Pd
47	⁹⁴Ag
48	⁹⁵Cd
49	⁹⁶In