# Isotopen van krypton

Het chemisch element krypton (Kr), met een atoommassa van 83,798(2) u, bezit 6 stabiele isotopen: $^{78}$Kr, $^{80}$Kr, $^{82}$Kr, $^{83}$Kr, $^{84}$Kr en $^{86}$Kr, waarvan $^{84}$Kr het meest abundant is (ongeveer 57%). De overige 25 radio-isotopen zijn onstabiel en hebben een relatief korte halveringstijd (de meeste minder dan een seconde).
De kortstlevende isotoop van krypton is $^{100}$Kr, met een halfwaardetijd van ongeveer 10 milliseconden. De langstlevende is $^{81}$Kr, met een halfwaardetijd van ongeveer 229.000 jaar. Krypton-81 wordt gebruikt om zeer oud grondwater (50.000 - 800.000 jaar) te dateren.

## Overzicht

| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | VP | Kernspin | Isotopische verhouding (molfractie) |
| Natuurlijk voorkomen (molfractie) |||
| $^{69}$Kr | 36 | 33 | 68,96518(43) | 32(10) ms | β$^+$ | $^{69}$Br | 5/2$^−$ | |
| $^{70}$Kr | 36 | 34 | 69,95526(41) | 52(17) ms | β$^+$ | $^{70}$Br | 0$^+$ | |
| $^{71}$Kr | 36 | 35 | 70,94963(70) | 100(3) ms | β$^+$ (94,8%) | $^{71}$Br | 5/2$^−$ | |
| $^{71}$Kr | 36 | 35 | 70,94963(70) | 100(3) ms | β$^+$, p (5,2%) | $^{70}$Se | 5/2$^−$ | |
| $^{72}$Kr | 36 | 36 | 71,942092(9) | 17,16(18) s | β$^+$ | $^{72}$Br | 0$^+$ | |
| $^{73}$Kr | 36 | 37 | 72,939289(7) | 28,6(6) s | β$^+$ (99,32%) | $^{73}$Br | 3/2$^−$ | |
| $^{73}$Kr | 36 | 37 | 72,939289(7) | 28,6(6) s | β$^+$, p (0,68%) | $^{72}$Se | 3/2$^−$ | |
| $^{73m}$Kr | 433,66(12) keV | 433,66(12) keV | 433,66(12) keV | 107(10) ns | | | (9/2$^+$) | |
| $^{74}$Kr | 36 | 38 | 73,9330844(22) | 11,50(11) min | β$^+$ | $^{74}$Br | 0$^+$ | |
| $^{75}$Kr | 36 | 39 | 74,930946(9) | 4,29(17) min | β$^+$ | $^{75}$Br | 5/2$^+$ | |
| $^{76}$Kr | 36 | 40 | 75,925910(4) | 14,8(1) uur | β$^+$ | $^{76}$Br | 0$^+$ | |
| $^{77}$Kr | 36 | 41 | 76,9246700(21) | 74,4(6) min | β$^+$ | $^{77}$Br | 5/2$^+$ | |
| $^{78}$Kr | 36 | 42 | 77,9203648(12) | stabiel | stabiel | stabiel | 0$^+$ | 0,00355(3) |
| $^{79}$Kr | 36 | 43 | 78,920082(4) | 35,04(10) uur | β$^+$ | $^{79}$Br | 1/2$^−$ | |
| $^{79m}$Kr | 129,77(5) keV | 129,77(5) keV | 129,77(5) keV | 50(3) s | | | 7/2$^+$ | |
| $^{80}$Kr | 36 | 44 | 79,9163790(16) | stabiel | stabiel | stabiel | 0$^+$ | 0,02286(10) |
| $^{81}$Kr | 36 | 45 | 80,9165920(21) | 229.110 jaar | EV | $^{81}$Br | 7/2$^+$ | |
| $^{81m}$Kr | 190,62(4) keV | 190,62(4) keV | 190,62(4) keV | 13,10(3) s | IT (99,975%) | $^{81}$Kr | 1/2$^−$ | |
| $^{81m}$Kr | 190,62(4) keV | 190,62(4) keV | 190,62(4) keV | 13,10(3) s | EV (0,025%) | $^{81}$Br | 1/2$^−$ | |
| $^{82}$Kr | 36 | 46 | 81,9134836(19) | stabiel | stabiel | stabiel | 0$^+$ | 0,11593(31) |
| $^{83}$Kr | 36 | 47 | 82,914136(3) | stabiel | stabiel | stabiel | 9/2$^+$ | 0,11500(19) |
| $^{83m1}$Kr | 9,4053(8) keV | 9,4053(8) keV | 9,4053(8) keV | 154,4(11) ns | 7/2$^+$ | | |
| $^{83m2}$Kr | 41,5569(10) keV | 41,5569(10) keV | 41,5569(10) keV | 1,83(2) uur | IT | $^{83}$Kr | 1/2$^−$ | |
| $^{84}$Kr | 36 | 48 | 83,911507(3) | stabiel | stabiel | stabiel | 0$^+$ | 0,56987(15) |
| $^{84m}$Kr | 3236,02(18) keV | 3236,02(18) keV | 3236,02(18) keV | 1,89(4) µs | | | 8$^+$ | |
| $^{85}$Kr | 36 | 49 | 84,9125273(21) | 10,776(3) jaar | β$^−$ | $^{85}$Rb | 9/2$^+$ | |
| $^{85m1}$Kr | 304,871(20) keV | 304,871(20) keV | 304,871(20) keV | 4,480(8) uur | β$^−$ (78,6%) | $^{85}$Rb | 1/2$^−$ | |
| $^{85m1}$Kr | 304,871(20) keV | 304,871(20) keV | 304,871(20) keV | 4,480(8) uur | IT (21,4%) | $^{85}$Kr | 1/2$^−$ | |
| $^{85m2}$Kr | 1991,8(13) keV | 1991,8(13) keV | 1991,8(13) keV | 1,6(7) µs | | | (17/2$^+$) | |
| $^{86}$Kr | 36 | 50 | 85,91061073(11) | stabiel | stabiel | stabiel | 0$^+$ | 0,17279(41) |
| $^{87}$Kr | 36 | 51 | 86,91335486(29) | 76,3(5) min | β$^−$ | $^{87}$Rb | 5/2$^+$ | |
| $^{88}$Kr | 36 | 52 | 87,914447(14) | 2,84(3) uur | β$^−$ | $^{88}$Rb | 0$^+$ | |
| $^{89}$Kr | 36 | 53 | 88,91763(6) | 3,15(4) min | β$^−$ | $^{89}$Rb | 3/2$^+$ | |
| $^{90}$Kr | 36 | 54 | 89,919517(20) | 32,32(9) s | β$^−$ | $^{90m}$Rb | 0$^+$ | |
| $^{91}$Kr | 36 | 55 | 90,92345(6) | 8,57(4) s | β$^−$ | $^{91}$Rb | 5/2$^+$ | |
| $^{92}$Kr | 36 | 56 | 91,926156(13) | 1,840(8) s | β$^−$ (99,96%) | $^{92}$Rb | 0$^+$ | |
| $^{92}$Kr | 36 | 56 | 91,926156(13) | 1,840(8) s | β$^−$, n (0,033%) | $^{91}$Rb | 0$^+$ | |
| $^{93}$Kr | 36 | 57 | 92,93127(11) | 1,286(10) s | β$^−$ (98,05%) | $^{93}$Rb | 1/2$^+$ | |
| $^{93}$Kr | 36 | 57 | 92,93127(11) | 1,286(10) s | β$^−$, n (1,95%) | $^{92}$Rb | 1/2$^+$ | |
| $^{94}$Kr | 36 | 58 | 93,93436(32) | 210(4) ms | β$^−$ (94,3%) | $^{94}$Rb | 0$^+$ | |
| $^{94}$Kr | 36 | 58 | 93,93436(32) | 210(4) ms | β$^−$, n (5,7%) | $^{93}$Rb | 0$^+$ | |
| $^{95}$Kr | 36 | 59 | 94,93984(43) | 114(3) ms | β$^−$ | $^{95}$Rb | 1/2$^+$ | |
| $^{96}$Kr | 36 | 60 | 95,94307(54) | 80(7) ms | β$^−$ | $^{96}$Rb | 0$^+$ | |
| $^{97}$Kr | 36 | 61 | 96,94856(54) | 63(4) ms | β$^−$ | $^{97}$Rb | 3/2$^+$ | |
| $^{97}$Kr | 36 | 61 | 96,94856(54) | 63(4) ms | β$^−$, n | $^{96}$Rb | 3/2$^+$ | |
| $^{98}$Kr | 36 | 62 | 97,95191(64) | 46(8) ms | | | 0$^+$ | |
| $^{99}$Kr | 36 | 63 | 98,95760(64) | 40(11) ms | | | (3/2$^+$) | |
| $^{100}$Kr | 36 | 64 | 99,96114(54) | 10 ms | | | 0$^+$ | |

## 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
* ↑ (en) N. Thonnard, L.D. MeKay & T.C. Labotka (2001) - Development of Laser-Based Resonance Ionization Techniques for 81-Kr and 85-Kr Measurements in the Geosciences, University of Tennessee, Institute for Rare Isotope Measurements, pp. 4–7
$^{69}$Kr · $^{70}$Kr · $^{71}$Kr · $^{72}$Kr · $^{73}$Kr · $^{73m}$Kr · $^{74}$Kr · $^{75}$Kr · $^{76}$Kr · $^{77}$Kr · $^{78}$Kr · $^{79}$Kr · $^{79m}$Kr · $^{80}$Kr · $^{81}$Kr · $^{81m}$Kr · $^{82}$Kr · $^{83}$Kr · $^{83m1}$Kr · $^{83m2}$Kr · $^{84}$Kr · $^{84m}$Kr · $^{85}$Kr · $^{85m1}$Kr · $^{85m2}$Kr · $^{86}$Kr · $^{87}$Kr · $^{88}$Kr · $^{89}$Kr · $^{90}$Kr · $^{91}$Kr · $^{92}$Kr · $^{93}$Kr · $^{94}$Kr · $^{95}$Kr · $^{96}$Kr · $^{97}$Kr · $^{98}$Kr · $^{99}$Kr · $^{100}$Kr · $^{101}$Kr