Editing Ruthenium (section)

=== Isotopes ===
{{Main|Isotopes of ruthenium}}

Naturally occurring ruthenium is composed of seven stable [[isotope]]s. Additionally, 34 [[radioactive isotopes]] have been discovered. Of these [[radioisotope]]s, the most stable are <sup>106</sup>Ru with a [[half-life]] of 373.59&nbsp;days, <sup>103</sup>Ru with a half-life of 39.26&nbsp;days and <sup>97</sup>Ru with a half-life of 2.9 days.<ref name="n1" /><ref name="n2" />

Fifteen other radioisotopes have been characterized with [[atomic weight]]s ranging from {{val|89.93|ul=Da}} (<sup>90</sup>Ru) to 114.928&nbsp;Da (<sup>115</sup>Ru). Most of these have half-lives that are less than five minutes; the exceptions are <sup>95</sup>Ru (half-life 1.643&nbsp;hours) and <sup>105</sup>Ru (half-life 4.44&nbsp;hours).<ref name="n1" /><ref name="n2" />

The primary [[decay mode]] before the most abundant isotope, <sup>102</sup>Ru, is [[electron capture]] while the primary mode after is [[beta emission]]. The primary [[decay product]] before <sup>102</sup>Ru is [[technetium]] and the primary decay product after is [[rhodium]].<ref name="n1">{{RubberBible86th}} Section&nbsp;11, Table of the Isotopes</ref><ref name="n2">{{NUBASE 2003}}</ref>

<sup>106</sup>Ru is a product of fission of a nucleus of [[uranium]] or [[plutonium]]. High concentrations of detected atmospheric <sup>106</sup>Ru were associated with an alleged [[Airborne radioactivity increase in Europe in autumn 2017|undeclared nuclear accident in Russia]] in 2017.<ref name="pnas2019">
{{cite journal
 | last1  = Masson      | first1  = O.    | last2  = Steinhauser | first2 = G.
 | last3  = Zok         | first3  = D.    | last4  = Saunier     | first4 = O.
 | last5  = Angelov     | first5  = H.    | last6  = Babić       | first6 = D.
 | last7  = Bečková     | first7  = V.    | last8  = Bieringer   | first8 = J.
 | last9  = Bruggeman   | first9  = M.    | last10 = Burbidge    | first10 = C.I.
 | last11 = Conil       | first11 = S.    | last12 = Dalheimer   | first12 = A.
 | last13 = de&nbsp;Geer       | first13 = L.-E.
 | last14 = de&nbsp;Vismes Ott | first14 = A.
 | last15 = Eleftheriadis      | first15 = K.
 | last16 = Estier      | first16 = S.    | last17 = Fischer     | first17 = H.
 | last18 = Garavaglia  | first18 = M.G.
  | last19 = Gasco Leonarte    | first19 = C.
 | last20 = Gorzkiewicz | first20 = K.    | last21 = Hainz       | first21 = D.
 | last22 = Hoffman     | first22 = I.    | last23 = Hýža        | first23 = M.
 | last24 = Isajenko    | first24 = K.    | last25 = Karhunen    | first25 = T.
 | last26 = Kastlander  | first26 = J.    | last27 = Katzlberger | first27 = C.
 | last28 = Kierepko    | first28 = R.    | last29 = Knetsch     | first29 = G.-J.
 | last30 = Kövendiné Kónyi    | first30 = J.     | display-authors = 6
 | year = 2019
 | title = Airborne concentrations and chemical considerations of radioactive ruthenium from an undeclared major nuclear release in 2017
 | journal = Proceedings of the National Academy of Sciences
 | volume = 116 | issue = 34 | pages = 16750–16759
 | doi = 10.1073/pnas.1907571116  | doi-access = free
 | pmc = 6708381  | bibcode = 2019PNAS..11616750M  | pmid = 31350352
}}
</ref>