Ruthenium-113m

Properties and data of the isotope ¹¹³Ru.

Content

General data

Name of the isotope:Ruthenium-113m; Ru-113mSymbol:¹¹³Ru or 11344RuMass number A:113 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:69Isotopic mass:112.92285(4) u (atomic weight of Ruthenium-113m)
Excitation energy: 0 + X keVNuclide mass:112.8987137 u (calculated nuclear mass without electrons)Mass excess:-71.86476 MeVMass defect:1.019330612 u (per nucleus)Nuclear binding energy:949.50034909 MeV (per nucleus)
8.40265796 MeV (average binding energy per nucleon)Half-life:510(30) msDecay constant λ:1.359112118745 s^-1Specific activity α:7.307825556722 × 10⁺²¹ Bq g^-1
197508798830.34 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)

Radioactive Decay

Half-life T_½ = 510(30) ms respectively 5.10 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹¹³Rh	ca. 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
¹¹³Ru		0.80(5) s	(1/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 69) and isobaric (same nucleon number A = 113) with Ruthenium-113m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 69	Isobar A = 113
38	¹⁰⁷Sr
39	¹⁰⁸Y
40	¹⁰⁹Zr
41	¹¹⁰Nb	¹¹³Nb
42	¹¹¹Mo	¹¹³Mo
43	¹¹²Tc	¹¹³Tc
44	¹¹³Ru	¹¹³Ru
45	¹¹⁴Rh	¹¹³Rh
46	¹¹⁵Pd	¹¹³Pd
47	¹¹⁶Ag	¹¹³Ag
48	¹¹⁷Cd	¹¹³Cd
49	¹¹⁸In	¹¹³In
50	¹¹⁹Sn	¹¹³Sn
51	¹²⁰Sb	¹¹³Sb
52	¹²¹Te	¹¹³Te
53	¹²²I	¹¹³I
54	¹²³Xe	¹¹³Xe
55	¹²⁴Cs	¹¹³Cs
56	¹²⁵Ba
57	¹²⁶La
58	¹²⁷Ce
59	¹²⁸Pr
60	¹²⁹Nd
61	¹³⁰Pm
62	¹³¹Sm
63	¹³²Eu