# Isotopen van osmium

Het chemisch element osmium (Os), met een atoommassa van 190,23(3) u, bezit 6 stabiele isotopen: $^{184}$Os, $^{187}$Os, $^{188}$Os, $^{189}$Os, $^{190}$Os en $^{192}$Os, waarvan de laatste het meest abundant is (ongeveer 40,8%). Daarnaast komt in de natuur ook de radio-isotoop $^{186}$Os voor, die een halfwaardetijd van 2 biljard jaar bezit. Het is tevens een primordiaal radionuclide. De stabiele isotopen $^{187}$Os en $^{188}$Os worden gebruikt in de renium-osmiumdatering. De overige 28 radio-isotopen zijn onstabiel en hebben een relatief korte halfwaardetijd (de meeste minder dan een seconde).
De kortstlevende isotoop van osmium is $^{162}$Os, met een halfwaardetijd van ongeveer 1,87 milliseconden. De langstlevende is $^{186}$Os, met een halfwaardetijd van 2 biljard jaar.

## Overzicht

| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | VP | Kernspin | Isotopische verhouding (molfractie) |
| Natuurlijk voorkomen (molfractie) |||
| $^{162}$Os | 76 | 86 | 161,98443(54) | 1,87(18) ms | α | $^{158}$W | 0$^+$ | |
| $^{163}$Os | 76 | 87 | 162,98269(43) | 5,5(6) ms | α | $^{159}$W | 7/2$^−$ | |
| $^{163}$Os | 76 | 87 | 162,98269(43) | 5,5(6) ms | β$^+$, p (zelden) | $^{162}$W | 7/2$^−$ | |
| $^{163}$Os | 76 | 87 | 162,98269(43) | 5,5(6) ms | β$^+$ (rare) | $^{163}$Re | 7/2$^−$ | |
| $^{164}$Os | 76 | 88 | 163,97804(22) | 21(1) ms | α (98%) | $^{160}$W | 0$^+$ | |
| $^{164}$Os | 76 | 88 | 163,97804(22) | 21(1) ms | β$^+$ (2%) | $^{164}$Re | 0$^+$ | |
| $^{165}$Os | 76 | 89 | 164,97676(22) | 71(3) ms | α (60%) | $^{161}$W | (7/2$^−$) | |
| $^{165}$Os | 76 | 89 | 164,97676(22) | 71(3) ms | β$^+$ (40%) | $^{165}$Re | (7/2$^−$) | |
| $^{166}$Os | 76 | 90 | 165,972691(20) | 216(9) ms | α (72%) | $^{162}$W | 0$^+$ | |
| $^{166}$Os | 76 | 90 | 165,972691(20) | 216(9) ms | β$^+$ (28%) | $^{166}$Re | 0$^+$ | |
| $^{167}$Os | 76 | 91 | 166,97155(8) | 810(60) ms | α (67%) | $^{163}$W | 3/2$^−$ | |
| $^{167}$Os | 76 | 91 | 166,97155(8) | 810(60) ms | β$^+$ (33%) | $^{167}$Re | 3/2$^−$ | |
| $^{168}$Os | 76 | 92 | 167,967804(13) | 2,06(6) s | β$^+$ (51%) | $^{168}$Re | 0$^+$ | |
| $^{168}$Os | 76 | 92 | 167,967804(13) | 2,06(6) s | α (49%) | $^{164}$W | 0$^+$ | |
| $^{169}$Os | 76 | 93 | 168,967019(27) | 3,40(9) s | β$^+$ (89%) | $^{169}$Re | 3/2$^−$ | |
| $^{169}$Os | 76 | 93 | 168,967019(27) | 3,40(9) s | α (11%) | $^{165}$W | 3/2$^−$ | |
| $^{170}$Os | 76 | 94 | 169,963577(12) | 7,46(23) s | β$^+$ (91,4%) | $^{170}$Re | 0$^+$ | |
| $^{170}$Os | 76 | 94 | 169,963577(12) | 7,46(23) s | α (8,6%) | $^{176}$W | 0$^+$ | |
| $^{171}$Os | 76 | 95 | 170,963185(20) | 8,3(2) s | β$^+$ (98,3%) | $^{171}$Re | (5/2$^−$) | |
| $^{171}$Os | 76 | 95 | 170,963185(20) | 8,3(2) s | α (1,7%) | $^{167}$W | (5/2$^−$) | |
| $^{172}$Os | 76 | 96 | 171,960023(16) | 19,2(5) s | β$^+$ (98,9%) | $^{172}$Re | 0$^+$ | |
| $^{172}$Os | 76 | 96 | 171,960023(16) | 19,2(5) s | α (1,1%) | $^{168}$W | 0$^+$ | |
| $^{173}$Os | 76 | 97 | 172,959808(16) | 22,4(9) s | β$^+$ (99,6%) | $^{173}$Re | (5/2$^−$) | |
| $^{173}$Os | 76 | 97 | 172,959808(16) | 22,4(9) s | α (0,4%) | $^{169}$W | (5/2$^−$) | |
| $^{174}$Os | 76 | 98 | 173,957062(12) | 44(4) s | β$^+$ (99,97%) | $^{174}$Re | 0$^+$ | |
| $^{174}$Os | 76 | 98 | 173,957062(12) | 44(4) s | α (0,024%) | $^{170}$W | 0$^+$ | |
| $^{175}$Os | 76 | 99 | 174,956946(15) | 1,4(1) min | β$^+$ | $^{175}$Re | (5/2$^−$) | |
| $^{176}$Os | 76 | 100 | 175,95481(3) | 3,6(5) min | β$^+$ | $^{176}$Re | 0$^+$ | |
| $^{177}$Os | 76 | 101 | 176,954965(17) | 3,0(2) min | β$^+$ | $^{177}$Re | 1/2$^−$ | |
| $^{178}$Os | 76 | 102 | 177,953251(18) | 5,0(4) min | β$^+$ | $^{178}$Re | 0$^+$ | |
| $^{179}$Os | 76 | 103 | 178,953816(19) | 6,5(3) min | β$^+$ | $^{179}$Re | (1/2$^−$) | |
| $^{180}$Os | 76 | 104 | 179,952379(22) | 21,5(4) min | β$^+$ | $^{180}$Re | 0$^+$ | |
| $^{181}$Os | 76 | 105 | 180,95324(3) | 105(3) min | β$^+$ | $^{181}$Re | 1/2$^−$ | |
| $^{181m1}$Os | 48,9(2) keV | 48,9(2) keV | 48,9(2) keV | 2,7(1) min | β$^+$ | $^{181}$Re | 7/2$^−$ | |
| $^{181m2}$Os | 156,5(7) keV | 156,5(7) keV | 156,5(7) keV | 316(18) ns | | | 9/2$^+$ | |
| $^{182}$Os | 76 | 106 | 181,952110(23) | 22,10(25) uur | EV | $^{182}$Re | 0$^+$ | |
| $^{183}$Os | 76 | 107 | 182,95313(5) | 13,0(5) uur | β$^+$ | $^{183}$Re | 9/2$^+$ | |
| $^{183m}$Os | 170,71(5) keV | 170,71(5) keV | 170,71(5) keV | 9,9(3) uur | β$^+$ (85%) | $^{183}$Re | 1/2$^−$ | |
| $^{183m}$Os | 170,71(5) keV | 170,71(5) keV | 170,71(5) keV | 9,9(3) uur | IT (15%) | $^{183}$Os | 1/2$^−$ | |
| $^{184}$Os | 76 | 108 | 183,9524891(14) | stabiel | stabiel | stabiel | 0$^+$ | 2(1) × 10$^{−4}$ |
| $^{185}$Os | 76 | 109 | 184,9540423(14) | 93,6(5) dagen | EV | $^{185}$Re | 1/2$^−$ | |
| $^{185m1}$Os | 102,3(7) keV | 102,3(7) keV | 102,3(7) keV | 3,0(4) µs | | | (7/2$^−$) | |
| $^{185m2}$Os | 275,7(8) keV | 275,7(8) keV | 275,7(8) keV | 0,78(5) µs | | | (11/2$^+$) | |
| $^{186}$Os | 76 | 110 | 185,9538382(15) | 2,0(11) × 10$^{15}$ jaar | α | $^{182}$W | 0$^+$ | 0,0159(3) |
| $^{187}$Os | 76 | 111 | 186,9557505(15) | stabiel | stabiel | stabiel | 1/2$^−$ | 0,0196(2) |
| $^{188}$Os | 76 | 112 | 187,9558382(15) | stabiel | stabiel | stabiel | 0$^+$ | 0,1324(8) |
| $^{189}$Os | 76 | 113 | 188,9581475(16) | stabiel | stabiel | stabiel | 3/2$^−$ | 0,1615(5) |
| $^{189m}$Os | 30,812(15) keV | 30,812(15) keV | 30,812(15) keV | 5,81(6) uur | IT | $^{189}$Os | 9/2$^−$ | |
| $^{190}$Os | 76 | 114 | 189,9584470(16) | stabiel | stabiel | stabiel | 0$^+$ | 0,2626(2) |
| $^{190m}$Os | 1705,4(2) keV | 1705,4(2) keV | 1705,4(2) keV | 9,9(1) min | IT | $^{190}$Os | 10$^−$ | |
| $^{191}$Os | 76 | 115 | 190,9609297(16) | 15,4(1) dagen | β$^−$ | $^{191}$Ir | 9/2$^−$ | |
| $^{191m}$Os | 74,382(3) keV | 74,382(3) keV | 74,382(3) keV | 13,10(5) uur | IT | $^{191}$Os | 3/2$^−$ | |
| $^{192}$Os | 76 | 116 | 191,9614807(27) | stabiel | stabiel | stabiel | 0$^+$ | 0,4078(19) |
| $^{192m}$Os | 2015,40(11) keV | 2015,40(11) keV | 2015,40(11) keV | 5,9(1) s | IT (87%) | $^{192}$Os | (10$^−$) | |
| $^{192m}$Os | 2015,40(11) keV | 2015,40(11) keV | 2015,40(11) keV | 5,9(1) s | β$^−$ (13%) | $^{192}$Ir | (10$^−$) | |
| $^{193}$Os | 76 | 117 | 192,9641516(27) | 30,11(1) uur | β$^−$ | $^{193}$Ir | 3/2$^−$ | |
| $^{194}$Os | 76 | 118 | 193,9651821(28) | 6,0(2) jaar | β$^−$ | $^{194}$Ir | 0$^+$ | |
| $^{195}$Os | 76 | 119 | 194,96813(54) | 6,5 min | β$^−$ | $^{195}$Ir | 3/2$^−$ | |
| $^{196}$Os | 76 | 120 | 195,96964(4) | 34,9(2) min | β$^−$ | $^{196}$Ir | 0$^+$ | |
| $^{197}$Os | 76 | 121 | | 2,8(6) min | | | | |

## Overzicht van isotopen per element

* (en) R.B. Firestone, S.Y. Frank Chu & C.M. Baglin (1999) - Table of Isotopes (online versie van de cd-rom)
* (en) G. Audi, A.H. Wapstra, C. Thibault, J. Blachot & O. Bersillon (2003) - The NUBASE evaluation of nuclear and decay properties, Nuclear Physics A, 729, pp. 3-128
* (en) J.R. de Laeter, J.K. Böhlke, P. De Bièvre, H. Hidaka, H.S. Peiser, K.J.R. Rosman & P.D.P. Taylor (2003) - Atomic weights of the elements. Review 2000 (IUPAC Technical Report), Pure and Applied Chemistry, 75 (6), pp. 683–800
* (en) M.E. Wieser (2006) - Atomic weights of the elements 2005 (IUPAC Technical Report), Pure and Applied Chemistry, 78 (11), pp. 2051–2066
* (en) David R. Lide (2004) - CRC Handbook of Chemistry and Physics (85th ed.), hoofdstuk 11, CRC Press - ISBN 978-0849304859
$^{161}$Os · $^{162}$Os · $^{163}$Os · $^{164}$Os · $^{165}$Os · $^{166}$Os · $^{167}$Os · $^{168}$Os · $^{169}$Os · $^{170}$Os · $^{171}$Os · $^{172}$Os · $^{173}$Os · $^{174}$Os · $^{175}$Os · $^{176}$Os · $^{177}$Os · $^{178}$Os · $^{179}$Os · $^{180}$Os · $^{181}$Os · $^{181m1}$Os · $^{181m2}$Os · $^{182}$Os · $^{183}$Os · $^{183m}$Os · $^{184}$Os · $^{185}$Os · $^{185m1}$Os · $^{185m2}$Os · $^{186}$Os · $^{187}$Os · $^{188}$Os · $^{189}$Os · $^{189m}$Os · $^{190}$Os · $^{190m}$Os · $^{191}$Os · $^{191m}$Os · $^{192}$Os · $^{192m}$Os · $^{193}$Os · $^{194}$Os · $^{195}$Os · $^{196}$Os · $^{197}$Os · $^{198}$Os · $^{199}$Os · $^{200}$Os · $^{201}$Os · $^{202}$Os · $^{203}$Os