鋨（76Os）有七種天然存在的同位素，其中五種穩定，分別是 187Os、188Os、189Os、190Os 和最常見的 192Os。另外兩種同位素 184Os 和 186Os 雖然有放射性，但它們極長的半衰期（分別為 1121013 年和 21015 年）使它們在實際用途中可以看作是穩定同位素。作為 187Re（半衰期 4561010 年）衰變產物的 187Os 可在中測量隕石的年齡。 除了七種天然存在的同位素以外，鋨還有 30 種人造同位素，其中最長壽的是半衰期六年的 194Os。鋨還有九種同核異構體，其中 191mOs 最穩定，半衰期 1310 小時。鋨所有的同位素理論上都有放射性，但仍未被觀測到。 圖表 161Os styletextalignright 76 styletextalignright 85 064 6 ms 157W 162Os styletextalignright 76 styletextalignright 86 16198443 54 187 18 ms 158W 0 rowspan3163Os rowspan3 styletextalignright 76 rowspan3 styletextalignright 87 rowspan316298269 43 rowspan355 6 ms 159W rowspan372 rowspan3 rowspan3 （不常見） 162W （不常見） 163Re rowspan2164Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 88 rowspan216397804 22 rowspan221 1 ms 98 160W rowspan20 rowspan2 rowspan2 2 164Re rowspan2165Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 89 rowspan216497676 22 rowspan271 3 ms 60 161W rowspan272 rowspan2 rowspan2 40 165Re rowspan2166Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 90 rowspan2165972691 20 rowspan2216 9 ms 72 162W rowspan20 rowspan2 rowspan2 28 166Re rowspan2167Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 91 rowspan216697155 8 rowspan2810 60 ms 67 163W rowspan232 rowspan2 rowspan2 33 167Re rowspan2168Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 92 rowspan2167967804 13 rowspan2206 6 s 51 168Re rowspan20 rowspan2 rowspan2 49 164W rowspan2169Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 93 rowspan2168967019 27 rowspan2340 9 s 89 169Re rowspan232 rowspan2 rowspan2 11 165W rowspan2170Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 94 rowspan2169963577 12 rowspan2746 23 s 914 170Re rowspan20 rowspan2 rowspan2 86 176W rowspan2171Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 95 rowspan2170963185 20 rowspan283 2 s 983 171Re rowspan252 rowspan2 rowspan2 17 167W rowspan2172Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 96 rowspan2171960023 16 rowspan2192 5 s 989 172Re rowspan20 rowspan2 rowspan2 11 168W rowspan2173Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 97 rowspan2172959808 16 rowspan2224 9 s 996 173Re rowspan252 rowspan2 rowspan2 4 169W rowspan2174Os rowspan2 styletextalignright 76 rowspan2 styletextalignright 98 rowspan2173957062 12 rowspan244 4 s 9997 174Re rowspan20 rowspan2 rowspan2 024 170W 175Os styletextalignright 76 styletextalignright 99 174956946 15 14 1 min 175Re 52 176Os styletextalignright 76 styletextalignright 100 17595481 3 36 5 min 176Re 0 177Os styletextalignright 76 styletextalignright 101 176954965 17 30 2 min 177Re 12 178Os styletextalignright 76 styletextalignright 102 177953251 18 50 4 min 178Re 0 179Os styletextalignright 76 styletextalignright 103 178953816 19 65 3 min 179Re 12 180Os styletextalignright 76 styletextalignright 104 179952379 22 215 4 min 180Re 0 181Os styletextalignright 76 styletextalignright 105 18095324 3 105 3 min 181Re 12 styletextindent1em 181m1Os colspan3 styletextindent2em 489 2 keV 27 1 min 181Re 72 styletextindent1em 181m2Os colspan3 styletextindent2em 1565 7 keV 316 18 ns 92 182Os styletextalignright 76 styletextalignright 106 181952110 23 2210 25 h 182Re 0 183Os styletextalignright 76 styletextalignright 107 18295313 5 130 5 h 183Re 92 rowspan2 styletextindent1em 183mOs rowspan2 colspan3 styletextindent2em 17071 5 keV rowspan299 3 h 85 183Re rowspan212 rowspan2 rowspan2 IT 15 183Os 184Os styletextalignright 76 styletextalignright 108 1839524891 14 112 231013 y α 理論上也會雙 β 衰變成 184W 180W 0 2 1104 185Os styletextalignright 76 styletextalignright 109 1849540423 14 936 5 d 185Re 12 styletextindent1em 185m1Os colspan3 styletextindent2em 1023 7 keV 30 4 µs 72 styletextindent1em 185m2Os colspan3 styletextindent2em 2757 8 keV 078 5 µs 112 186Os 放射性同位素 styletextalignright 76 styletextalignright 110 1859538382 15 20 111015 y 182W 0 00159 3 187Os 用於 styletextalignright 76 styletextalignright 111 1869557505 15 colspan3 aligncenter 觀測上穩定理論上會 α 衰變成 183W 12 00196 2 188Os styletextalignright 76 styletextalignright 112 1879558382 15 colspan3 aligncenter 觀測上穩定理論上會 α 衰變成 184W 0 01324 8 189Os styletextalignright 76 styletextalignright 113 1889581475 16 colspan3 aligncenter 觀測上穩定理論上會 α 衰變成 185W 32 01615 5 styletextindent1em 189mOs colspan3 styletextindent2em 30812 15 keV 581 6 h IT 189Os 92 190Os styletextalignright 76 styletextalignright 114 1899584470 16 colspan3 aligncenter 觀測上穩定理論上會 α 衰變成 186W 0 02626 2 styletextindent1em 190mOs colspan3 styletextindent2em 17054 2 keV 99 1 min IT 190Os 10 191Os styletextalignright 76 styletextalignright 115 1909609297 16 154 1 d 191Ir 92 styletextindent1em 191mOs colspan3 styletextindent2em 74382 3 keV 1310 5 h IT 191Os 32 192Os styletextalignright 76 styletextalignright 116 1919614807 27 colspan3 aligncenter 觀測上穩定理論上會 α 衰變成 188W，或是雙 β 衰變成 192Pt 0 04078 19 rowspan2 styletextindent1em 192mOs rowspan2 colspan3 styletextindent2em 201540 11 keV rowspan259 1 s IT 87 192Os rowspan210 rowspan2 rowspan2 13 192Ir 193Os styletextalignright 76 styletextalignright 117 1929641516 27 3011 1 h 193Ir 32 194Os styletextalignright 76 styletextalignright 118 1939651821 28 60 2 y 194Ir 0 195Os styletextalignright 76 styletextalignright 119 19496813 54 65 min 195Ir 32 196Os styletextalignright 76 styletextalignright 120 19596964 4 349 2 min 196Ir 0 197Os styletextalignright 76 styletextalignright 121 28 6 min 參考文獻 Isotope masses from Ame2003 Atomic Mass Evaluation by G Audi AH 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 683800 2003 and Atomic Weights Revised 2005 Halflife spin and isomer data selected from these sources Editing notes on this articles talk page Audi Bersillon Blachot Wapstra The Nubase2003 evaluation of nuclear and decay properties Nuc Phys A 729 pp 3128 2003 National Nuclear Data Center Brookhaven National Laboratory Information extracted from the NuDat 21 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 Os Category 鋨