Ruthenium-120

Properties and data of the isotope ¹²⁰Ru.

Content

General data

Name of the isotope:Ruthenium-120; Ru-120Symbol:¹²⁰Ru or 12044RuMass number A:120 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:76Isotopic mass:119.94631(43) u (atomic weight of Ruthenium-120)Nuclide mass:119.9221737 u (calculated nuclear mass without electrons)Mass excess:-50.01191 MeVMass defect:1.056525024 u (per nucleus)Nuclear binding energy:984.14672071 MeV (per nucleus)
8.20122267 MeV (average binding energy per nucleon)Separation energy:S_N = 5.52(50) MeV (first neutron)
S_P = 16.93(64) MeV (first proton)Half-life:42(2) msDecay constant λ:16.503504299046 s^-1Specific activity α:8.351800636254 × 10⁺²² Bq g^-1
2257243415203.9 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2010

Radioactive Decay

Half-life T_½ = 42(2) ms respectively 4.2 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹²⁰Rh		8.80(45) MeV
β^-, n	¹¹⁹Rh		4.74(40) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 76) and isobaric (same nucleon number A = 120) with Ruthenium-120. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 76	Isobar A = 120
42	¹¹⁸Mo
43	¹¹⁹Tc	¹²⁰Tc
44	¹²⁰Ru	¹²⁰Ru
45	¹²¹Rh	¹²⁰Rh
46	¹²²Pd	¹²⁰Pd
47	¹²³Ag	¹²⁰Ag
48	¹²⁴Cd	¹²⁰Cd
49	¹²⁵In	¹²⁰In
50	¹²⁶Sn	¹²⁰Sn
51	¹²⁷Sb	¹²⁰Sb
52	¹²⁸Te	¹²⁰Te
53	¹²⁹I	¹²⁰I
54	¹³⁰Xe	¹²⁰Xe
55	¹³¹Cs	¹²⁰Cs
56	¹³²Ba	¹²⁰Ba
57	¹³³La	¹²⁰La
58	¹³⁴Ce	¹²⁰Ce
59	¹³⁵Pr
60	¹³⁶Nd
61	¹³⁷Pm
62	¹³⁸Sm
63	¹³⁹Eu
64	¹⁴⁰Gd
65	¹⁴¹Tb
66	¹⁴²Dy
67	¹⁴³Ho
68	¹⁴⁴Er
69	¹⁴⁵Tm