Ruthenium-117

Properties and data of the isotope ¹¹⁷Ru.

Content

General data

Name of the isotope:Ruthenium-117; Ru-117Symbol:¹¹⁷Ru or 11744RuMass number A:117 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:73Isotopic mass:116.93613(46) u (atomic weight of Ruthenium-117)Nuclide mass:116.9119937 u (calculated nuclear mass without electrons)Mass excess:-59.49452 MeVMass defect:1.040710276 u (per nucleus)Nuclear binding energy:969.41537783 MeV (per nucleus)
8.28560152 MeV (average binding energy per nucleon)Separation energy:S_N = 3.49(43) MeV (first neutron)
S_P = 15.32(53) MeV (first proton)Half-life:151(3) msDecay constant λ:4.5903786792049 s^-1Specific activity α:2.383095431605 × 10⁺²² Bq g^-1
644079846379.84 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1994

Radioactive Decay

Half-life T_½ = 151(3) ms respectively 1.51 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹¹⁷Rh	100 %	9.41(43) MeV
β^-, n	¹¹⁶Rh	?	3.17(44) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 73) and isobaric (same nucleon number A = 117) with Ruthenium-117. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 73	Isobar A = 117
41	¹¹⁴Nb
42	¹¹⁵Mo	¹¹⁷Mo
43	¹¹⁶Tc	¹¹⁷Tc
44	¹¹⁷Ru	¹¹⁷Ru
45	¹¹⁸Rh	¹¹⁷Rh
46	¹¹⁹Pd	¹¹⁷Pd
47	¹²⁰Ag	¹¹⁷Ag
48	¹²¹Cd	¹¹⁷Cd
49	¹²²In	¹¹⁷In
50	¹²³Sn	¹¹⁷Sn
51	¹²⁴Sb	¹¹⁷Sb
52	¹²⁵Te	¹¹⁷Te
53	¹²⁶I	¹¹⁷I
54	¹²⁷Xe	¹¹⁷Xe
55	¹²⁸Cs	¹¹⁷Cs
56	¹²⁹Ba	¹¹⁷Ba
57	¹³⁰La	¹¹⁷La
58	¹³¹Ce
59	¹³²Pr
60	¹³³Nd
61	¹³⁴Pm
62	¹³⁵Sm
63	¹³⁶Eu
64	¹³⁷Gd
65	¹³⁸Tb
66	¹³⁹Dy
67	¹⁴⁰Ho