Ruthenium-103m

Properties and data of the isotope ^103mRu.

Content

General data

Name of the isotope:Ruthenium-103m; Ru-103mSymbol:^103mRu or 103m44RuMass 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-103m)
Excitation energy: 238.2(7) keVNuclide 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)Half-life:1.69(7) msDecay constant λ:410.14626068636 s^-1Specific activity α:2.42152799512 × 10⁺²⁴ Bq g^-1
65446702571000 Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-

Radioactive Decay

Half-life T_½ = 1.69(7) ms respectively 1.69 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁰³Ru	100 %

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
¹⁰³Ru		39.247(13) d	3/2+

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-103m. 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