Ruthenium-105

Properties and data of the isotope ¹⁰⁵Ru.

Content

General data

Name of the isotope:Ruthenium-105; Ru-105Symbol:¹⁰⁵Ru or 10544RuMass number A:105 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:61Isotopic mass:104.9077455(27) u (atomic weight of Ruthenium-105)Nuclide mass:104.8836092 u (calculated nuclear mass without electrons)Mass excess:-85.93451 MeVMass defect:0.96511578400001 u (per nucleus)Nuclear binding energy:898.9995621 MeV (per nucleus)
8.56190059 MeV (average binding energy per nucleon)Separation energy:S_N = 5.91010(11) MeV (first neutron)
S_P = 10.720(25) MeV (first proton)Half-life:4.44(2) hDecay constant λ:4.336506384884 × 10^-5 s^-1Specific activity α:2.511062720172 × 10⁺¹⁷ Bq g^-1
6786656.0004651 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = (-) 0.32Year of discovery:1945

Radioactive Decay

Half-life T_½ = 4.44(2) h (hours) respectively 1.5984 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰⁵Rh	100 %	1.916(8) MeV

Parent Nuclides

Direct parent isotope is: ¹⁰⁵Tc.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 61) and isobaric (same nucleon number A = 105) with Ruthenium-105. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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