Ruthenium-109m

Properties and data of the isotope ¹⁰⁹Ru.

Content

General data

Name of the isotope:Ruthenium-109m; Ru-109mSymbol:¹⁰⁹Ru or 10944RuMass number A:109 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:65Isotopic mass:108.913324(10) u (atomic weight of Ruthenium-109m)
Excitation energy: 68.75(12) keVNuclide mass:108.8891877 u (calculated nuclear mass without electrons)Mass excess:-80.73817 MeVMass defect:0.99419694800001 u (per nucleus)Nuclear binding energy:926.08849188 MeV (per nucleus)
8.4962247 MeV (average binding energy per nucleon)Half-life:0.50(12) μsDecay constant λ:1386294.3611199 s^-1Specific activity α:7.730055477777 × 10⁺²⁷ Bq g^-1
2.089204183183 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)

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
¹⁰⁹Ru		34.4(2) s	(5/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 65) and isobaric (same nucleon number A = 109) with Ruthenium-109m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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