Ruthenium-103

Properties and data of the isotope ¹⁰³Ru.

Content

General data

Name of the isotope:Ruthenium-103; Ru-103Symbol:¹⁰³Ru or 10344RuMass number A:103 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:59Isotopic mass:102.9063148(5) u (atomic weight of Ruthenium-103)Nuclide mass:102.8821785 u (calculated nuclear mass without electrons)Mass excess:-87.2672 MeVMass defect:0.949216652 u (per nucleus)Nuclear binding energy:884.18961604 MeV (per nucleus)
8.5843652 MeV (average binding energy per nucleon)Separation energy:S_N = 6.23205(15) MeV (first neutron)
S_P = 9.983(9) MeV (first proton)Half-life:39.247(13) dDecay constant λ:2.044114661512 × 10^-7 s^-1Specific activity α:1.206857492694 × 10⁺¹⁵ Bq g^-1
32617.770072835 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = 0.206(3)Quadrupole moment Q:+ 0.62(2) barn (100 fm²)Nuclear g-factor:g_l = 0.13733333333333Year of discovery:1945

Radioactive Decay

Half-life T_½ = 39.247(13) d respectively 3.3909408 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰³Rh	100 %	0.7645(23) MeV

Parent Nuclides

Direct parent isotope is: ¹⁰³Tc.

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
^103mRu	238.2(7) keV	1.69(7) ms	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 59) and isobaric (same nucleon number A = 103) with Ruthenium-103. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 59	Isobar A = 103
33	⁹²As
34	⁹³Se
35	⁹⁴Br
36	⁹⁵Kr
37	⁹⁶Rb	¹⁰³Rb
38	⁹⁷Sr	¹⁰³Sr
39	⁹⁸Y	¹⁰³Y
40	⁹⁹Zr	¹⁰³Zr
41	¹⁰⁰Nb	¹⁰³Nb
42	¹⁰¹Mo	¹⁰³Mo
43	¹⁰²Tc	¹⁰³Tc
44	¹⁰³Ru	¹⁰³Ru
45	¹⁰⁴Rh	¹⁰³Rh
46	¹⁰⁵Pd	¹⁰³Pd
47	¹⁰⁶Ag	¹⁰³Ag
48	¹⁰⁷Cd	¹⁰³Cd
49	¹⁰⁸In	¹⁰³In
50	¹⁰⁹Sn	¹⁰³Sn
51	¹¹⁰Sb	¹⁰³Sb
52	¹¹¹Te
53	¹¹²I
54	¹¹³Xe
55	¹¹⁴Cs
56	¹¹⁵Ba
57	¹¹⁶La