Technetium-104

Properties and data of the isotope ¹⁰⁴Tc.

Contents

General data

Name of the isotope:Technetium-104; Tc-104Symbol:¹⁰⁴Tc or 10443TcMass number A:104 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:61Isotopic mass:103.911429(27) u (atomic weight of Technetium-104)Nuclide mass:103.8878412 u (calculated nuclear mass without electrons)Mass excess:-82.50336 MeVMass defect:0.95360725200001 u (per nucleus)Nuclear binding energy:888.27943359 MeV (per nucleus)
8.5411484 MeV (average binding energy per nucleon)Separation energy:S_N = 5.971(27) MeV (first neutron)
S_P = 8.832(27) MeV (first proton)Half-life:18.3(3) minDecay constant λ:0.00063128158520942 s^-1Specific activity α:3.690938474189 × 10⁺¹⁸ Bq g^-1
99755093.897016 Ci g^-1Spin and parity:
(nuclear angular momentum)(3+)Year of discovery:1956

Radioactive Decay

Half-life T_½ = 18.3(3) min (minutes) respectively 1.098 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰⁴Ru	100 %	5.592(25) MeV

Parent Nuclides

Direct parent isotope is: ¹⁰⁴Mo.

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
^104m1Tc	69.7(2) keV	3.5(3) μs	(+)
^104m2Tc	106.1(3) keV	0.40(2) μs	(+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 61) and isobaric (same nucleon number A = 104) with Technetium-104. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 61	Isobar A = 104
34	⁹⁵Se
35	⁹⁶Br
36	⁹⁷Kr
37	⁹⁸Rb
38	⁹⁹Sr	¹⁰⁴Sr
39	¹⁰⁰Y	¹⁰⁴Y
40	¹⁰¹Zr	¹⁰⁴Zr
41	¹⁰²Nb	¹⁰⁴Nb
42	¹⁰³Mo	¹⁰⁴Mo
43	¹⁰⁴Tc	¹⁰⁴Tc
44	¹⁰⁵Ru	¹⁰⁴Ru
45	¹⁰⁶Rh	¹⁰⁴Rh
46	¹⁰⁷Pd	¹⁰⁴Pd
47	¹⁰⁸Ag	¹⁰⁴Ag
48	¹⁰⁹Cd	¹⁰⁴Cd
49	¹¹⁰In	¹⁰⁴In
50	¹¹¹Sn	¹⁰⁴Sn
51	¹¹²Sb	¹⁰⁴Sb
52	¹¹³Te
53	¹¹⁴I
54	¹¹⁵Xe
55	¹¹⁶Cs
56	¹¹⁷Ba
57	¹¹⁸La
58	¹¹⁹Ce