Technetium-98

Properties and data of the isotope ⁹⁸Tc.

Contents

General data

Name of the isotope:Technetium-98; Tc-98Symbol:⁹⁸Tc or 9843TcMass number A:98 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:55Isotopic mass:97.90721(3) u (atomic weight of Technetium-98)Nuclide mass:97.8836222 u (calculated nuclear mass without electrons)Mass excess:-86.43333 MeVMass defect:0.905836756 u (per nucleus)Nuclear binding energy:843.78150319 MeV (per nucleus)
8.61001534 MeV (average binding energy per nucleon)Separation energy:S_N = 7.279(5) MeV (first neutron)
S_P = 6.176(3) MeV (first proton)Half-life:4.2(3) × 10⁶ aDecay constant λ:5.233226883259 × 10^-15 s^-1Specific activity α:32489927.260819 Bq g^-1
0.0008781061421843 Ci g^-1Spin and parity:
(nuclear angular momentum)(6)+Year of discovery:1955

Radioactive Decay

Half-life T_½ = 4.2(3) × 10⁶ a respectively 1.324512 × 10¹⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁹⁸Ru	100 %	1.793(7) 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
^98mTc	90.76(16) keV	14.7(3) μs	(2)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 55) and isobaric (same nucleon number A = 98) with Technetium-98. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 55	Isobar A = 98
30	⁸⁵Zn
31	⁸⁶Ga
32	⁸⁷Ge
33	⁸⁸As
34	⁸⁹Se
35	⁹⁰Br	⁹⁸Br
36	⁹¹Kr	⁹⁸Kr
37	⁹²Rb	⁹⁸Rb
38	⁹³Sr	⁹⁸Sr
39	⁹⁴Y	⁹⁸Y
40	⁹⁵Zr	⁹⁸Zr
41	⁹⁶Nb	⁹⁸Nb
42	⁹⁷Mo	⁹⁸Mo
43	⁹⁸Tc	⁹⁸Tc
44	⁹⁹Ru	⁹⁸Ru
45	¹⁰⁰Rh	⁹⁸Rh
46	¹⁰¹Pd	⁹⁸Pd
47	¹⁰²Ag	⁹⁸Ag
48	¹⁰³Cd	⁹⁸Cd
49	¹⁰⁴In	⁹⁸In
50	¹⁰⁵Sn
51	¹⁰⁶Sb
52	¹⁰⁷Te
53	¹⁰⁸I
54	¹⁰⁹Xe