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Isotopes of ruthenium



Naturally occurring Ruthenium (Ru) is composed of seven isotopes. The most stable radioisotopes are 106Ru with a half-life of 373.59 days, 103Ru with a half-life of 39.26 days and 97Ru with a half-life of 2.9 days.

Additional recommended knowledge

Fifteen other radioisotopes have been characterized with atomic weights ranging from 89.93 u (90Ru) to 114.928 u (115Ru). Most of these have half-lives that are less than five minutes except 95Ru (half-life: 1.643 hours) and 105Ru (half-life: 4.44 hours).

The primary decay mode before the most abundant isotope, 102Ru, is electron capture and the primary mode after is beta emission. The primary decay product before 102Ru is technetium and the primary mode after is rhodium.
Standard atomic mass: 101.07(2) u

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
87Ru 44 43 86.94918(64)# 50# ms [>1.5 µs] 1/2-#
88Ru 44 44 87.94026(43)# 1.3(3) s [1.2(+3-2) s] 0+
89Ru 44 45 88.93611(54)# 1.38(11) s (7/2)(+#)
90Ru 44 46 89.92989(32)# 11.7(9) s 0+
91Ru 44 47 90.92629(63)# 7.9(4) s (9/2+)
91mRu 80(300)# keV 7.6(8) s (1/2-)
92Ru 44 48 91.92012(32)# 3.65(5) min 0+
93Ru 44 49 92.91705(9) 59.7(6) s (9/2)+
93m1Ru 734.40(10) keV 10.8(3) s (1/2)-
93m2Ru 2082.6(9) keV 2.20(17) µs (21/2)+
94Ru 44 50 93.911360(14) 51.8(6) min 0+
94mRu 2644.55(25) keV 71(4) µs (8+)
95Ru 44 51 94.910413(13) 1.643(14) h 5/2+
96Ru 44 52 95.907598(8) STABLE [>67E+15 a] 0+ 0.0554(14)
97Ru 44 53 96.907555(9) 2.791(4) d 5/2+
98Ru 44 54 97.905287(7) STABLE 0+ 0.0187(3)
99Ru 44 55 98.9059393(22) STABLE 5/2+ 0.1276(14)
100Ru 44 56 99.9042195(22) STABLE 0+ 0.1260(7)
101Ru 44 57 100.9055821(22) STABLE 5/2+ 0.1706(2)
101mRu 527.56(10) keV 17.5(4) µs 11/2-
102Ru 44 58 101.9043493(22) STABLE 0+ 0.3155(14)
103Ru 44 59 102.9063238(22) 39.26(2) d 3/2+
103mRu 238.2(7) keV 1.69(7) ms 11/2-
104Ru 44 60 103.905433(3) STABLE 0+ 0.1862(27)
105Ru 44 61 104.907753(3) 4.44(2) h 3/2+
106Ru 44 62 105.907329(8) 373.59(15) d 0+
107Ru 44 63 106.90991(13) 3.75(5) min (5/2)+
108Ru 44 64 107.91017(12) 4.55(5) min 0+
109Ru 44 65 108.91320(7) 34.5(10) s (5/2+)#
110Ru 44 66 109.91414(6) 11.6(6) s 0+
111Ru 44 67 110.91770(8) 2.12(7) s (5/2+)
112Ru 44 68 111.91897(8) 1.75(7) s 0+
113Ru 44 69 112.92249(8) 0.80(5) s (5/2+)
113mRu 130(18) keV 510(30) ms (11/2-)
114Ru 44 70 113.92428(25)# 0.53(6) s 0+
115Ru 44 71 114.92869(14) 740(80) ms
116Ru 44 72 115.93081(75)# 400# ms [>300 ns] 0+
117Ru 44 73 116.93558(75)# 300# ms [>300 ns]
118Ru 44 74 117.93782(86)# 200# ms [>300 ns] 0+
119Ru 44 75 118.94284(75)# 170# ms [>300 ns]
120Ru 44 76 119.94531(86)# 80# ms [>300 ns] 0+

Notes

  • Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

  • Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
  • Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
  • Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
    • Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
    • National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
    • David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.


Isotopes of technetium Isotopes of ruthenium Isotopes of rhodium
Index to isotope pages
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_ruthenium". A list of authors is available in Wikipedia.
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