Ruthenium-111

Properties and data of the isotope ¹¹¹Ru.

Content

General data

Name of the isotope:Ruthenium-111; Ru-111Symbol:¹¹¹Ru or 11144RuMass number A:111 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:67Isotopic mass:110.917568(10) u (atomic weight of Ruthenium-111)Nuclide mass:110.8934317 u (calculated nuclear mass without electrons)Mass excess:-76.78491 MeVMass defect:1.00728278 u (per nucleus)Nuclear binding energy:938.27786587 MeV (per nucleus)
8.45295375 MeV (average binding energy per nucleon)Separation energy:S_N = 4.784(13) MeV (first neutron)
S_P = 13.040(13) MeV (first proton)Half-life:2.12(7) sDecay constant λ:0.32695621724526 s^-1Specific activity α:1.789978541166 × 10⁺²¹ Bq g^-1
48377798409.903 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Year of discovery:1971

Radioactive Decay

Half-life T_½ = 2.12(7) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹¹¹Rh	100 %	5.519(12) MeV

Parent Nuclides

Direct parent isotopes are: ¹¹¹Tc, ²⁵²Cf, ²⁴⁸Cm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 67) and isobaric (same nucleon number A = 111) with Ruthenium-111. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 67	Isobar A = 111
38	¹⁰⁵Sr
39	¹⁰⁶Y
40	¹⁰⁷Zr	¹¹¹Zr
41	¹⁰⁸Nb	¹¹¹Nb
42	¹⁰⁹Mo	¹¹¹Mo
43	¹¹⁰Tc	¹¹¹Tc
44	¹¹¹Ru	¹¹¹Ru
45	¹¹²Rh	¹¹¹Rh
46	¹¹³Pd	¹¹¹Pd
47	¹¹⁴Ag	¹¹¹Ag
48	¹¹⁵Cd	¹¹¹Cd
49	¹¹⁶In	¹¹¹In
50	¹¹⁷Sn	¹¹¹Sn
51	¹¹⁸Sb	¹¹¹Sb
52	¹¹⁹Te	¹¹¹Te
53	¹²⁰I	¹¹¹I
54	¹²¹Xe	¹¹¹Xe
55	¹²²Cs
56	¹²³Ba
57	¹²⁴La
58	¹²⁵Ce
59	¹²⁶Pr
60	¹²⁷Nd
61	¹²⁸Pm
62	¹²⁹Sm
63	¹³⁰Eu