Technetium-108

Properties and data of the isotope ¹⁰⁸Tc.

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-108; Tc-108Symbol:¹⁰⁸Tc or 10843TcMass number A:108 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:65Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5116279069767 (= neutron-proton ratio)Neutron excess (N-Z):22Isotopic mass:107.918494(9) u (atomic weight of Technetium-108)Nuclide mass:107.8949062 u (calculated nuclear mass without electrons)Mass excess:-75.92235 MeVMass defect:0.98120191600002 u (per nucleus)Nuclear binding energy:913.98369754 MeV (per nucleus)
8.46281201 MeV (average binding energy per nucleon)Separation energy:S_N = 5.244(12) MeV (first neutron)
S_P = 10.660(13) MeV (first proton)Half-life:5.17(7) sDecay constant λ:0.1340710213849 s^-1Specific activity α:7.545743701079 × 10⁺²⁰ Bq g^-1
20393901894.809 Ci g^-1Spin and parity:
(nuclear angular momentum)(2)+Year of discovery:1970

Radioactive Decay

Half-life T_½ = 5.17(7) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰⁸Ru	100 %	7.739(12) MeV

Parent Nuclides

Direct parent isotope is: ¹⁰⁸Mo.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 65) and isobaric (same nucleon number A = 108) with Technetium-108. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 65	Isobar A = 108
36	¹⁰¹Kr
37	¹⁰²Rb
38	¹⁰³Sr
39	¹⁰⁴Y	¹⁰⁸Y
40	¹⁰⁵Zr	¹⁰⁸Zr
41	¹⁰⁶Nb	¹⁰⁸Nb
42	¹⁰⁷Mo	¹⁰⁸Mo
43	¹⁰⁸Tc	¹⁰⁸Tc
44	¹⁰⁹Ru	¹⁰⁸Ru
45	¹¹⁰Rh	¹⁰⁸Rh
46	¹¹¹Pd	¹⁰⁸Pd
47	¹¹²Ag	¹⁰⁸Ag
48	¹¹³Cd	¹⁰⁸Cd
49	¹¹⁴In	¹⁰⁸In
50	¹¹⁵Sn	¹⁰⁸Sn
51	¹¹⁶Sb	¹⁰⁸Sb
52	¹¹⁷Te	¹⁰⁸Te
53	¹¹⁸I	¹⁰⁸I
54	¹¹⁹Xe
55	¹²⁰Cs
56	¹²¹Ba
57	¹²²La
58	¹²³Ce
59	¹²⁴Pr
60	¹²⁵Nd
61	¹²⁶Pm