Ruthenium-108

Properties and data of the isotope ¹⁰⁸Ru.

Content

General data

Name of the isotope:Ruthenium-108; Ru-108Symbol:¹⁰⁸Ru or 10844RuMass number A:108 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:64Isotopic mass:107.910186(9) u (atomic weight of Ruthenium-108)Nuclide mass:107.8860497 u (calculated nuclear mass without electrons)Mass excess:-83.6612 MeVMass defect:0.988670032 u (per nucleus)Nuclear binding energy:920.94020279 MeV (per nucleus)
8.5272241 MeV (average binding energy per nucleon)Separation energy:S_N = 7.870(12) MeV (first neutron)
S_P = 12.200(12) MeV (first proton)Half-life:4.55(5) minDecay constant λ:0.0025390006613917 s^-1Specific activity α:1.428992488446 × 10⁺¹⁹ Bq g^-1
386214186.06651 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1955

Radioactive Decay

Half-life T_½ = 4.55(5) min (minutes) respectively 2.73 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰⁸Rh	100 %	1.370(16) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁰⁸Tc, ²⁵²Cf.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 64) and isobaric (same nucleon number A = 108) with Ruthenium-108. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 64	Isobar A = 108
36	¹⁰⁰Kr
37	¹⁰¹Rb
38	¹⁰²Sr
39	¹⁰³Y	¹⁰⁸Y
40	¹⁰⁴Zr	¹⁰⁸Zr
41	¹⁰⁵Nb	¹⁰⁸Nb
42	¹⁰⁶Mo	¹⁰⁸Mo
43	¹⁰⁷Tc	¹⁰⁸Tc
44	¹⁰⁸Ru	¹⁰⁸Ru
45	¹⁰⁹Rh	¹⁰⁸Rh
46	¹¹⁰Pd	¹⁰⁸Pd
47	¹¹¹Ag	¹⁰⁸Ag
48	¹¹²Cd	¹⁰⁸Cd
49	¹¹³In	¹⁰⁸In
50	¹¹⁴Sn	¹⁰⁸Sn
51	¹¹⁵Sb	¹⁰⁸Sb
52	¹¹⁶Te	¹⁰⁸Te
53	¹¹⁷I	¹⁰⁸I
54	¹¹⁸Xe
55	¹¹⁹Cs
56	¹²⁰Ba
57	¹²¹La
58	¹²²Ce
59	¹²³Pr
60	¹²⁴Nd