Technetium-103

Properties and data of the isotope ¹⁰³Tc.

Contents

General data

Name of the isotope:Technetium-103; Tc-103Symbol:¹⁰³Tc or 10343TcMass number A:103 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:60Isotopic mass:102.909174(11) u (atomic weight of Technetium-103)Nuclide mass:102.8855862 u (calculated nuclear mass without electrons)Mass excess:-84.60387 MeVMass defect:0.947197336 u (per nucleus)Nuclear binding energy:882.3086353 MeV (per nucleus)
8.56610326 MeV (average binding energy per nucleon)Separation energy:S_N = 8.102(13) MeV (first neutron)
S_P = 8.327(13) MeV (first proton)Half-life:54.2(8) sDecay constant λ:0.012788693368265 s^-1Specific activity α:7.550520870414 × 10⁺¹⁹ Bq g^-1
2040681316.3283 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Year of discovery:1957

Radioactive Decay

Half-life T_½ = 54.2(8) s respectively 5.42 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰³Ru	100 %	2.663(10) MeV

Parent Nuclides

Direct parent isotope is: ¹⁰³Mo.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 60) and isobaric (same nucleon number A = 103) with Technetium-103. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 60	Isobar A = 103
34	⁹⁴Se
35	⁹⁵Br
36	⁹⁶Kr
37	⁹⁷Rb	¹⁰³Rb
38	⁹⁸Sr	¹⁰³Sr
39	⁹⁹Y	¹⁰³Y
40	¹⁰⁰Zr	¹⁰³Zr
41	¹⁰¹Nb	¹⁰³Nb
42	¹⁰²Mo	¹⁰³Mo
43	¹⁰³Tc	¹⁰³Tc
44	¹⁰⁴Ru	¹⁰³Ru
45	¹⁰⁵Rh	¹⁰³Rh
46	¹⁰⁶Pd	¹⁰³Pd
47	¹⁰⁷Ag	¹⁰³Ag
48	¹⁰⁸Cd	¹⁰³Cd
49	¹⁰⁹In	¹⁰³In
50	¹¹⁰Sn	¹⁰³Sn
51	¹¹¹Sb	¹⁰³Sb
52	¹¹²Te
53	¹¹³I
54	¹¹⁴Xe
55	¹¹⁵Cs
56	¹¹⁶Ba
57	¹¹⁷La