Ruthenium-94m

Properties and data of the isotope ⁹⁴Ru.

Content

General data

Name of the isotope:Ruthenium-94m; Ru-94mSymbol:⁹⁴Ru or 9444RuMass number A:94 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:50Isotopic mass:93.911343(3) u (atomic weight of Ruthenium-94m)
Excitation energy: 2644.1(4) keVNuclide mass:93.8872067 u (calculated nuclear mass without electrons)Mass excess:-82.58346 MeVMass defect:0.866204208 u (per nucleus)Nuclear binding energy:806.86402253 MeV (per nucleus)
8.58365981 MeV (average binding energy per nucleon)Half-life:71(4) μ sDecay constant λ:9762.6363459147 s^-1Specific activity α:6.321717337573 × 10⁺²⁵ Bq g^-1
1.708572253398 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)8+

Radioactive Decay

Half-life T_½ = 71(4) μ s respectively 7.1 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁹⁴Ru	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
⁹⁴Ru		51.8(6) min	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 50) and isobaric (same nucleon number A = 94) with Ruthenium-94m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 50	Isobar A = 94
28	⁷⁸Ni
29	⁷⁹Cu
30	⁸⁰Zn
31	⁸¹Ga
32	⁸²Ge
33	⁸³As
34	⁸⁴Se	⁹⁴Se
35	⁸⁵Br	⁹⁴Br
36	⁸⁶Kr	⁹⁴Kr
37	⁸⁷Rb	⁹⁴Rb
38	⁸⁸Sr	⁹⁴Sr
39	⁸⁹Y	⁹⁴Y
40	⁹⁰Zr	⁹⁴Zr
41	⁹¹Nb	⁹⁴Nb
42	⁹²Mo	⁹⁴Mo
43	⁹³Tc	⁹⁴Tc
44	⁹⁴Ru	⁹⁴Ru
45	⁹⁵Rh	⁹⁴Rh
46	⁹⁶Pd	⁹⁴Pd
47	⁹⁷Ag	⁹⁴Ag
48	⁹⁸Cd	⁹⁴Cd
49	⁹⁹In
50	¹⁰⁰Sn