Isotopes of ruthenium

{{Short description|none}} {{Infobox ruthenium isotopes}} Naturally occurring ruthenium (₄₄Ru) is composed of seven stable isotopes: 96, 98-102, 104 (of which the first and last may in the future be found radioactive). Additionally, 27 synthetic radioactive isotopes have been discovered. Of these radioisotopes, the most stable are ¹⁰⁶Ru with a half-life of 371.8 days or 1.018 years, ¹⁰³Ru, with a half-life of 39.245 days, and ⁹⁷Ru with a half-life of 2.837 days.

The other known isotopes run from ⁸⁷Ru to ¹²⁰Ru, and most of these have half-lives that are less than five minutes, except ⁹⁴Ru (51.8 minutes), ⁹⁵Ru (1.607 hours), and ¹⁰⁵Ru (4.44 hours).

The primary decay mode before the most abundant isotope, ¹⁰²Ru, is electron capture to isotopes of technetium, and after beta emission to isotopes of rhodium. Double beta decay is the allowed mode for the two observationally stable isotopes: ⁹⁶Ru and ¹⁰⁴Ru.

Because of the volatility of ruthenium tetroxide ({{chem|Ru|O|4}}), ruthenium isotopes with relatively short half-life are considered the next most hazardous airborne isotopes, after iodine-131, in case of release by a nuclear accident.<ref name="Ronneau_1995">Ronneau, C., Cara, J., & Rimski-Korsakov, A. (1995). [https://doi.org/10.1016/0265-931X(95)91633-F Oxidation-enhanced emission of ruthenium from nuclear fuel]. Journal of Environmental Radioactivity, 26(1), 63-70.</ref><ref name="Backman_2004">Backman, U., Lipponen, M., Auvinen, A., Jokiniemi, J., & Zilliacus, R. (2004). [https://inis.iaea.org/collection/NCLCollectionStore/_Public/36/031/36031958.pdf Ruthenium behaviour in severe nuclear accident conditions]. Final report (No. NKS–100). Nordisk Kernesikkerhedsforskning.</ref><ref name="Beuzet_2012">Beuzet, E., Lamy, J. S., Perron, H., Simoni, E., & Ducros, G. (2012). [https://www.academia.edu/download/50047444/Ruthenium_release_modelling_in_air_and_s20161101-1709-kv6n0y.pdf Ruthenium release modelling in air and steam atmospheres under severe accident conditions using the MAAP4 code]{{dead link|date=July 2022|bot=medic}}{{cbignore|bot=medic}}. Nuclear Engineering and Design, 246, 157-162.</ref> The two most important isotopes of ruthenium so released are those with the longest half-life: ¹⁰³Ru ¹⁰⁶Ru.<ref name="Backman_2004" /> thumb|Ruthenium-96

== List of isotopes == {{Anchor}} <!--Please delete anchor(s) from the list above or table below if adding a dedicated isotope section(s).--> {{Isotopes table |symbol=Ru |refs=NUBASE2020, AME2020 II,<!-- updated 2024–01–03 --> IsotopeFRIB, IsomerFRIB |notes=m, unc(), mass#, exen#, hl#, spin(), spin#, daughter-st, n, p, IT, discoveryname }} |-id=Ruthenium-85 | ⁸⁵Ru | style="text-align:right" | 44 | style="text-align:right" | 41 | 84.96712(54)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/85.pdf 2017] | 1#&nbsp;ms{{br}}[>&nbsp;400&nbsp;ns] | | | 3/2−# | | |-id=Ruthenium-86 | ⁸⁶Ru | style="text-align:right" | 44 | style="text-align:right" | 42 | 85.95731(43)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/86.pdf 2017] | 50#&nbsp;ms{{br}}[>&nbsp;400&nbsp;ns] | | | 0+ | | |-id=Ruthenium-87 | ⁸⁷Ru | style="text-align:right" | 44 | style="text-align:right" | 43 | 86.95091(43)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/87.pdf 1995] | 50#&nbsp;ms{{br}}[>&nbsp;1.5&nbsp;μs] | | | 1/2−# | | |-id=Ruthenium-88 | rowspan=2|⁸⁸Ru | rowspan=2 style="text-align:right" | 44 | rowspan=2 style="text-align:right" | 44 | rowspan=2|87.941760(20)<ref name="kimura2025">{{cite journal |last1=Kimura |first1=S. |last2=Wada |first2=M. |last3=Fu |first3=C. Y. |last4=Fukuda |first4=N. |last5=Hirayama |first5=Y. |last6=Hou |first6=D. S. |last7=Iimura |first7=S. |last8=Ishiyama |first8=H. |last9=Ito |first9=Y. |last10=Kubono |first10=S. |last11=Kusaka |first11=K. |last12=Michimasa |first12=S. |last13=Miyatake |first13=H. |last14=Nishimura |first14=S. |last15=Niwase |first15=T. |last16=Phong |first16=V. |last17=Rosenbusch |first17=M. |last18=Schatz |first18=H. |last19=Schury |first19=P. |last20=Shimizu |first20=Y. |last21=Suzuki |first21=H. |last22=Takamine |first22=A. |last23=Takeda |first23=H. |last24=Togano |first24=Y. |last25=Watanabe |first25=Y. X. |last26=Xian |first26=W. D. |last27=Yanagisawa |first27=Y. |last28=Yeung |first28=T. T. |last29=Yoshimoto |first29=M. |last30=Zha |first30=S. |title=Precision Mass Measurements around Mo 84 Rule Out ZrNb Cycle Formation in the Rapid Proton-Capture Process at Type I X-Ray Bursts |journal=Physical Review Letters |date=8 October 2025 |volume=135 |issue=15 |article-number=152701 |doi=10.1103/2dyn-q7wp |pmid=41138077 }}</ref> | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/88.pdf 1994] | rowspan=2|1.5(3)&nbsp;s | β⁺ (>96.4%) | ⁸⁸Tc | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺, p (<3.6%) | ⁸⁷Mo |-id=Ruthenium-89 | rowspan=2|⁸⁹Ru | rowspan=2 style="text-align:right" | 44 | rowspan=2 style="text-align:right" | 45 | rowspan=2|88.937338(26) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/89.pdf 1992] | rowspan=2|1.32(3)&nbsp;s | β⁺ (96.7%) | ⁸⁹Tc | rowspan=2|(9/2+) | rowspan=2| | rowspan=2| |- | β⁺, p (3.1%) | ⁸⁸Mo |-id=Ruthenium-90 | ⁹⁰Ru | style="text-align:right" | 44 | style="text-align:right" | 46 | 89.9303444(40) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/90.pdf 1991] | 11.7(9)&nbsp;s | β⁺ | ⁹⁰Tc | 0+ | | |-id=Ruthenium-91 | ⁹¹Ru | style="text-align:right" | 44 | style="text-align:right" | 47 | 90.9267415(24) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/91.pdf 1983] | 8.0(4)&nbsp;s | β⁺ | ⁹¹Tc | (9/2+) | | |-id=Ruthenium-91m | rowspan=2 style="text-indent:1em" | ^91mRu | rowspan=2 colspan="3" style="text-indent:2em" | 432(31)&nbsp;keV<ref name="xing2023">{{cite journal |last1=Xing |first1=Y. M. |last2=Yuan |first2=C. X. |last3=Wang |first3=M. |last4=Zhang |first4=Y. H. |last5=Zhou |first5=X. H. |last6=Litvinov |first6=Yu. A. |last7=Blaum |first7=K. |last8=Xu |first8=H. S. |last9=Bao |first9=T. |last10=Chen |first10=R. J. |last11=Fu |first11=C. Y. |last12=Gao |first12=B. S. |last13=Ge |first13=W. W. |last14=He |first14=J. J. |last15=Huang |first15=W. J. |last16=Liao |first16=T. |last17=Li |first17=J. G. |last18=Li |first18=H. F. |last19=Litvinov |first19=S. |last20=Naimi |first20=S. |last21=Shuai |first21=P. |last22=Sun |first22=M. Z. |last23=Wang |first23=Q. |last24=Xu |first24=X. |last25=Xu |first25=F. R. |last26=Yamaguchi |first26=T. |last27=Yan |first27=X. L. |last28=Yang |first28=J. C. |last29=Yuan |first29=Y. J. |last30=Zeng |first30=Q. |last31=Zhang |first31=M. |last32=Zhou |first32=X. |title=Isochronous mass measurements of neutron-deficient nuclei from Sn 112 projectile fragmentation |journal=Physical Review C |date=11 January 2023 |volume=107 |issue=1 |article-number=014304 |doi=10.1103/PhysRevC.107.014304}}</ref> | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/91Ru-1.pdf 1983] | rowspan=2|7.6(8)&nbsp;s | β⁺ (>99.9%) | ⁹¹Tc | rowspan=2|(1/2−) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ⁹⁰Mo |-id=Ruthenium-92 | ⁹²Ru | style="text-align:right" | 44 | style="text-align:right" | 48 | 91.9202344(29) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/92.pdf 1971] | 3.65(5)&nbsp;min | β⁺ | ⁹²Tc | 0+ | | |-id=Ruthenium-92m | style="text-indent:1em" | ^92mRu | colspan="3" style="text-indent:2em" | 2833.9(18)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/92Ru-1.pdf 1980] | 100(8)&nbsp;ns | IT | ⁹²Ru | (8+) | | |-id=Ruthenium-93 | ⁹³Ru | style="text-align:right" | 44 | style="text-align:right" | 49 | 92.9171044(22) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/93.pdf 1972] | 59.7(6)&nbsp;s | β⁺ | ⁹³Tc | (9/2)+ | | |-id=Ruthenium-93m1 | rowspan=3 style="text-indent:1em" | ^93m1Ru | rowspan=3 colspan="3" style="text-indent:2em" | 734.40(10)&nbsp;keV | rowspan=3 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/93Ru-1.pdf 1976] | rowspan=3|10.8(3)&nbsp;s | β⁺ (78.0%) | ⁹³Tc | rowspan=3|(1/2)− | rowspan=3| | rowspan=3| |- | IT (22.0%) | ⁹³Ru |- | β⁺, p (0.027%) | ⁹²Mo |-id=Ruthenium-93m2 | style="text-indent:1em" | ^93m2Ru | colspan="3" style="text-indent:2em" | 2082.5(9)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/93Ru-2.pdf 1983] | 2.30(7)&nbsp;μs | IT | ⁹³Ru | (21/2)+ | | |-id=Ruthenium-94 | ⁹⁴Ru | style="text-align:right" | 44 | style="text-align:right" | 50 | 93.9113429(34) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/94.pdf 1952] | 51.8(6)&nbsp;min | β⁺ | ⁹⁴Tc | 0+ | | |-id=Ruthenium-94m | style="text-indent:1em" | ^94mRu | colspan="3" style="text-indent:2em" | 2644.1(4)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/94Ru-1.pdf 1969] | 67.5(28)&nbsp;μs | IT | ⁹⁴Ru | 8+ | | |-id=Ruthenium-95 | ⁹⁵Ru | style="text-align:right" | 44 | style="text-align:right" | 51 | 94.910404(10) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/95.pdf 1948] | 1.607(4)&nbsp;h | β⁺ | ⁹⁵Tc | 5/2+ | | |-id=Ruthenium-96 | ⁹⁶Ru | style="text-align:right" | 44 | style="text-align:right" | 52 | 95.90758891(18) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/96.pdf 1931] | colspan=3 align=center|'''Observationally Stable'''<ref group="n">Believed to undergo β⁺β⁺ decay to '''⁹⁶Mo''' with a half-life over 8×10¹⁹&nbsp;years</ref> | 0+ | 0.0554(14) | |-id=Ruthenium-97 | ⁹⁷Ru | style="text-align:right" | 44 | style="text-align:right" | 53 | 96.9075458(30) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/97.pdf 1946] | 2.8370(14)&nbsp;d | β⁺ | ⁹⁷Tc | 5/2+ | | |-id=Ruthenium-98 | ⁹⁸Ru | style="text-align:right" | 44 | style="text-align:right" | 54 | 97.9052867(69) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/98.pdf 1944] | colspan=3 align=center|'''Stable''' | 0+ | 0.0187(3) | |-id=Ruthenium-99 | ⁹⁹Ru | style="text-align:right" | 44 | style="text-align:right" | 55 | 98.90593028(37) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/99.pdf 1931] | colspan=3 align=center|'''Stable''' | 5/2+ | 0.1276(14) | |-id=Ruthenium-100 | ¹⁰⁰Ru | style="text-align:right" | 44 | style="text-align:right" | 56 | 99.90421046(37) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/100.pdf 1931] | colspan=3 align=center|'''Stable''' | 0+ | 0.1260(7) | |-id=Ruthenium-101 | ¹⁰¹Ru<ref group="n" name="FP">Fission product</ref> | style="text-align:right" | 44 | style="text-align:right" | 57 | 100.90557309(44) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/101.pdf 1931] | colspan=3 align=center|'''Stable''' | 5/2+ | 0.1706(2) | |-id=Ruthenium-101m | style="text-indent:1em" | ^101mRu | colspan="3" style="text-indent:2em" | 527.56(10)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/101Ru-1.pdf 1964] | 17.5(4)&nbsp;μs | IT | '''¹⁰¹Ru''' | 11/2− | | |-id=Ruthenium-102 | ¹⁰²Ru<ref group="n" name="FP" /> | style="text-align:right" | 44 | style="text-align:right" | 58 | 101.90434031(45) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/102.pdf 1931] | colspan=3 align=center|'''Stable''' | 0+ | 0.3155(14) | |-id=Ruthenium-103 | ¹⁰³Ru<ref group="n" name="FP" /> | style="text-align:right" | 44 | style="text-align:right" | 59 | 102.90631485(47) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/103.pdf 1946] | 39.245(8)&nbsp;d | β⁻ | '''¹⁰³Rh''' | 3/2+ | | |-id=Ruthenium-103m | style="text-indent:1em" | ^103mRu | colspan="3" style="text-indent:2em" | 238.2(7)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/103Ru-1.pdf 1964] | 1.69(7)&nbsp;ms | IT | ¹⁰³Ru | 11/2− | | |-id=Ruthenium-104 | ¹⁰⁴Ru<ref group="n" name="FP" /> | style="text-align:right" | 44 | style="text-align:right" | 60 | 103.9054253(27) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/104.pdf 1931] | colspan=3 align=center|'''Observationally Stable'''<ref group="n">Believed to undergo β⁻β⁻ decay to '''¹⁰⁴Pd'''</ref> | 0+ | 0.1862(27) | |-id=Ruthenium-105 | ¹⁰⁵Ru<ref group="n" name="FP" /> | style="text-align:right" | 44 | style="text-align:right" | 61 | 104.9077455(27) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/105.pdf 1946] | 4.439(11)&nbsp;h | β⁻ | ¹⁰⁵Rh | 3/2+ | | |-id=Ruthenium-105m | style="text-indent:1em" | ^105mRu | colspan="3" style="text-indent:2em" | 20.606(14)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/105Ru-1.pdf 1974] | 340(15)&nbsp;ns | IT | ¹⁰⁵Ru | 5/2+ | | |-id=Ruthenium-106 | ¹⁰⁶Ru<ref group="n" name="FP" /> | style="text-align:right" | 44 | style="text-align:right" | 62 | 105.9073282(58) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/106.pdf 1946] | 371.8(18)&nbsp;d | β⁻ | ¹⁰⁶Rh | 0+ | | |-id=Ruthenium-107 | ¹⁰⁷Ru | style="text-align:right" | 44 | style="text-align:right" | 63 | 106.9099698(93) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/107.pdf 1951] | 3.75(5)&nbsp;min | β⁻ | ¹⁰⁷Rh | (5/2)+ | | |-id=Ruthenium-108 | ¹⁰⁸Ru | style="text-align:right" | 44 | style="text-align:right" | 64 | 107.9101858(93) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/108.pdf 1955] | 4.55(5)&nbsp;min | β⁻ | ¹⁰⁸Rh | 0+ | | |-id=Ruthenium-109 | ¹⁰⁹Ru | style="text-align:right" | 44 | style="text-align:right" | 65 | 108.9133237(96) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/109.pdf 1967] | 34.4(2)&nbsp;s | β⁻ | ¹⁰⁹Rh | (5/2+) | | |-id=Ruthenium-109m | style="text-indent:1em" | ^109mRu | colspan="3" style="text-indent:2em" | 96.14(15)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/109Ru-1.pdf 1999] | 680(30)&nbsp;ns | IT | ¹⁰⁹Ru | (5/2−) | | |-id=Ruthenium-110 | ¹¹⁰Ru | style="text-align:right" | 44 | style="text-align:right" | 66 | 109.9140385(96) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/110.pdf 1970] | 12.04(17)&nbsp;s | β⁻ | ¹¹⁰Rh | 0+ | | |-id=Ruthenium-111 | ¹¹¹Ru | style="text-align:right" | 44 | style="text-align:right" | 67 | 110.917568(10) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/111.pdf 1970] | 2.12(7)&nbsp;s | β⁻ | ¹¹¹Rh | 5/2+ | | |-id=Ruthenium-112 | ¹¹²Ru | style="text-align:right" | 44 | style="text-align:right" | 68 | 111.918807(10) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/112.pdf 1970] | 1.75(7)&nbsp;s | β⁻ | ¹¹²Rh | 0+ | | |-id=Ruthenium-113 | ¹¹³Ru | style="text-align:right" | 44 | style="text-align:right" | 69 | 112.922847(41) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/113.pdf 1988] | 0.80(5)&nbsp;s | β⁻ | ¹¹³Rh | (1/2+) | | |-id=Ruthenium-113m | rowspan=2 style="text-indent:1em" | ^113mRu | rowspan=2 colspan="3" style="text-indent:2em" | 131(33)&nbsp;keV | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/113Ru-1.pdf 1998] | rowspan=2|510(30)&nbsp;ms | β⁻ (?%) | ¹¹³Rh | rowspan=2|(7/2−) | rowspan=2| | rowspan=2| |- | IT (?%) | ¹¹³Ru |-id=Ruthenium-114 | rowspan=3|¹¹⁴Ru | rowspan=3 style="text-align:right" | 44 | rowspan=3 style="text-align:right" | 70 | rowspan=3|113.9246144(38) | rowspan=3 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/114.pdf 1991] | rowspan=3|0.54(3)&nbsp;s | β⁻ | ¹¹⁴Rh | rowspan=3|0+ | rowspan=3| | rowspan=3| |- | β^-, n? | ¹¹³Rh |- | β^-, 2n? | ¹¹²Rh |-id=Ruthenium-115 | rowspan=2|¹¹⁵Ru | rowspan=2 style="text-align:right" | 44 | rowspan=2 style="text-align:right" | 71 | rowspan=2|114.929033(27) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/115.pdf 1992] | rowspan=2|318(19)&nbsp;ms | β⁻ | ¹¹⁵Rh | rowspan=2|(1/2+) | rowspan=2| | rowspan=2| |- | β^-, n? | ¹¹⁴Rh |-id=Ruthenium-115m | rowspan=2 style="text-indent:1em" | ^115mRu | rowspan=2 colspan="3" style="text-indent:2em" | 82(6)&nbsp;keV | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/115Ru-1.pdf 2010] | rowspan=2|76(6)&nbsp;ms | β⁻ (?%) | ¹¹⁵Rh | rowspan=2|(7/2−) | rowspan=2| | rowspan=2| |- | IT (?%) | ¹¹⁵Ru |-id=Ruthenium-116 | rowspan=2|¹¹⁶Ru | rowspan=2 style="text-align:right" | 44 | rowspan=2 style="text-align:right" | 72 | rowspan=2|115.9312192(40) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/116.pdf 1994] | rowspan=2|204(6)&nbsp;ms | β⁻ | ¹¹⁶Rh | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β^-, n? | ¹¹⁵Rh |-id=Ruthenium-117 | rowspan=2|¹¹⁷Ru | rowspan=2 style="text-align:right" | 44 | rowspan=2 style="text-align:right" | 73 | rowspan=2|116.93614(47) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/117.pdf 1994] | rowspan=2|151(3)&nbsp;ms | β⁻ | ¹¹⁷Rh | rowspan=2|3/2+# | rowspan=2| | rowspan=2| |- | β^-, n? | ¹¹⁶Rh |-id=Ruthenium-117m | style="text-indent:1em" | ^117mRu | colspan="3" style="text-indent:2em" | 185.0(4)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/117Ru-1.pdf 2012] | 2.49(6)&nbsp;μs | IT | ¹¹⁷Ru | 7/2−# | | |-id=Ruthenium-118 | rowspan=2|¹¹⁸Ru | rowspan=2 style="text-align:right" | 44 | rowspan=2 style="text-align:right" | 74 | rowspan=2|117.93881(22)# | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/118.pdf 1994] | rowspan=2|99(3)&nbsp;ms | β⁻ | ¹¹⁸Rh | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β^-, n? | ¹¹⁷Rh |-id=Ruthenium-119 | rowspan=3|¹¹⁹Ru | rowspan=3 style="text-align:right" | 44 | rowspan=3 style="text-align:right" | 75 | rowspan=3|118.94409(32)# | rowspan=3 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/119.pdf 1997] | rowspan=3|69.5(20)&nbsp;ms | β⁻ | ¹¹⁹Rh | rowspan=3|3/2+# | rowspan=3| | rowspan=3| |- | β^-, n? | ¹¹⁸Rh |- | β^-, 2n? | ¹¹⁷Rh |-id=Ruthenium-119m | style="text-indent:1em" | ^119mRu | colspan="3" style="text-indent:2em" | 227.1(7)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/44/119Ru-1.pdf 2012] | 384(22)&nbsp;ns | IT | ¹¹⁹Ru | | | |-id=Ruthenium-120 | ¹²⁰Ru | style="text-align:right" | 44 | style="text-align:right" | 76 | 119.94662(43)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/120.pdf 2010] | 45(2)&nbsp;ms | β⁻ | ¹²⁰Rh | 0+ | | |-id=Ruthenium-121 | ¹²¹Ru | style="text-align:right" | 44 | style="text-align:right" | 77 | 120.95210(43)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/121.pdf 2010] | 29(2)&nbsp;ms | β⁻ | ¹²¹Rh | 3/2+# | | |-id=Ruthenium-122 | ¹²²Ru | style="text-align:right" | 44 | style="text-align:right" | 78 | 121.95515(54)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/122.pdf 2010] | 25(1)&nbsp;ms | β⁻ | ¹²²Rh | 0+ | | |-id=Ruthenium-123 | ¹²³Ru | style="text-align:right" | 44 | style="text-align:right" | 79 | 122.96076(54)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/123.pdf 2010] | 19(2)&nbsp;ms | β⁻ | ¹²³Rh | 3/2+# | | |-id=Ruthenium-124 | ¹²⁴Ru | style="text-align:right" | 44 | style="text-align:right" | 80 | 123.96394(64)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/124.pdf 2010] | 15(3)&nbsp;ms | β⁻ | ¹²⁴Rh | 0+ | | |-id=Ruthenium-125 | ¹²⁵Ru | style="text-align:right" | 44 | style="text-align:right" | 81 | 124.96954(32)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/44/125.pdf 2018] | 12#&nbsp;ms{{br}}[>&nbsp;550&nbsp;ns] | | | 3/2+# | | {{Isotopes table/footer}}

== Alleged ruthenium-106 leak == In September 2017 an estimated amount of 100 to 300 TBq (0.3 to 1 g) of ¹⁰⁶Ru was released in Russia, probably in the Ural region. It was, after ruling out release from a reentering satellite, concluded that the source was either in nuclear fuel cycle facilities or radioactive source production. In France levels up to 0.036mBq/m³ of air were measured. It was estimated that for distances of the order of a few tens of kilometres, contamination levels may have exceeded the limits for non-dairy foodstuffs.<ref>[https://www.irsn.fr/EN/newsroom/News/Documents/IRSN_Information-Report_Ruthenium-106-in-europe_20171109.pdf] Detection of ruthenium 106 in France and in Europe, IRSN France (9 Nov 2017)</ref>

== Asteroid that ended the Cretaceous period == The ratios of the amounts of ruthenium isotopes were used to determine the age of the asteroid which exterminated the dinosaurs at the end of the Cretaceous period, and to show that it originated beyond Jupiter in the outer solar system.<ref>{{cite web |last1=Dunham |first1=Will |title=Asteroid that doomed the dinosaurs originated beyond Jupiter |url=https://www.theglobeandmail.com/world/article-asteroid-that-doomed-the-dinosaurs-originated-beyond-jupiter/ |website=The Globe and Mail |access-date=8 July 2025 |date=15 August 2024 |quote=ruthenium shows distinct isotopic compositions between inner and outer solar system materials}}</ref>

== See also == '''Daughter products other than ruthenium''' * Isotopes of rhodium * Isotopes of technetium * Isotopes of molybdenum

== References == {{reflist}}

{{Navbox element isotopes}}

Category:Isotopes of ruthenium Category:Ruthenium Ruthenium