Ruthenium-101m

Properties and data of the isotope ¹⁰¹Ru.

Content

General data

Name of the isotope:Ruthenium-101m; Ru-101mSymbol:¹⁰¹Ru or 10144RuMass number A:101 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:57Isotopic mass:100.905577(8) u (atomic weight of Ruthenium-101m)
Excitation energy: 527.56(10) keVNuclide mass:100.8814407 u (calculated nuclear mass without electrons)Mass excess:-87.95446 MeVMass defect:0.93262462000001 u (per nucleus)Nuclear binding energy:868.73423778 MeV (per nucleus)
8.60132909 MeV (average binding energy per nucleon)Half-life:17.5(4) μsDecay constant λ:39608.410317711 s^-1Specific activity α:2.385274261714 × 10⁺²⁶ Bq g^-1
6.446687193822 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-

Radioactive Decay

Half-life T_½ = 17.5(4) μs respectively 1.75 × 10^-5 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁰¹Ru	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
¹⁰¹Ru		stable	5/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 57) and isobaric (same nucleon number A = 101) with Ruthenium-101m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 57	Isobar A = 101
32	⁸⁹Ge
33	⁹⁰As
34	⁹¹Se
35	⁹²Br
36	⁹³Kr	¹⁰¹Kr
37	⁹⁴Rb	¹⁰¹Rb
38	⁹⁵Sr	¹⁰¹Sr
39	⁹⁶Y	¹⁰¹Y
40	⁹⁷Zr	¹⁰¹Zr
41	⁹⁸Nb	¹⁰¹Nb
42	⁹⁹Mo	¹⁰¹Mo
43	¹⁰⁰Tc	¹⁰¹Tc
44	¹⁰¹Ru	¹⁰¹Ru
45	¹⁰²Rh	¹⁰¹Rh
46	¹⁰³Pd	¹⁰¹Pd
47	¹⁰⁴Ag	¹⁰¹Ag
48	¹⁰⁵Cd	¹⁰¹Cd
49	¹⁰⁶In	¹⁰¹In
50	¹⁰⁷Sn	¹⁰¹Sn
51	¹⁰⁸Sb
52	¹⁰⁹Te
53	¹¹⁰I
54	¹¹¹Xe
55	¹¹²Cs