Technetium-105

Properties and data of the isotope ¹⁰⁵Tc.

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-105; Tc-105Symbol:¹⁰⁵Tc or 10543TcMass number A:105 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:62Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4418604651163 (= neutron-proton ratio)Neutron excess (N-Z):19Isotopic mass:104.91166(4) u (atomic weight of Technetium-105)Nuclide mass:104.8880722 u (calculated nuclear mass without electrons)Mass excess:-82.28818 MeVMass defect:0.962041168 u (per nucleus)Nuclear binding energy:896.13557574 MeV (per nucleus)
8.53462453 MeV (average binding energy per nucleon)Separation energy:S_N = 7.86(4) MeV (first neutron)
S_P = 9.23(4) MeV (first proton)Half-life:7.6(1) minDecay constant λ:0.0015200596064911 s^-1Specific activity α:8.801935640182 × 10⁺¹⁸ Bq g^-1
237890152.43736 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2-)Year of discovery:1955

Radioactive Decay

Half-life T_½ = 7.6(1) min (minutes) respectively 4.56 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰⁵Ru	100 %	3.64(4) MeV

Parent Nuclides

Direct parent isotope is: ¹⁰⁵Mo.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 62) and isobaric (same nucleon number A = 105) with Technetium-105. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 62	Isobar A = 105
35	⁹⁷Br
36	⁹⁸Kr
37	⁹⁹Rb
38	¹⁰⁰Sr	¹⁰⁵Sr
39	¹⁰¹Y	¹⁰⁵Y
40	¹⁰²Zr	¹⁰⁵Zr
41	¹⁰³Nb	¹⁰⁵Nb
42	¹⁰⁴Mo	¹⁰⁵Mo
43	¹⁰⁵Tc	¹⁰⁵Tc
44	¹⁰⁶Ru	¹⁰⁵Ru
45	¹⁰⁷Rh	¹⁰⁵Rh
46	¹⁰⁸Pd	¹⁰⁵Pd
47	¹⁰⁹Ag	¹⁰⁵Ag
48	¹¹⁰Cd	¹⁰⁵Cd
49	¹¹¹In	¹⁰⁵In
50	¹¹²Sn	¹⁰⁵Sn
51	¹¹³Sb	¹⁰⁵Sb
52	¹¹⁴Te	¹⁰⁵Te
53	¹¹⁵I
54	¹¹⁶Xe
55	¹¹⁷Cs
56	¹¹⁸Ba
57	¹¹⁹La
58	¹²⁰Ce
59	¹²¹Pr