# Isotopen van radon

Het chemisch element radon (Rn), met een atoommassa van ongeveer 222 u, bezit geen stabiele isotopen en wordt dus geclassificeerd als radioactief element. De 35 radio-isotopen zijn onstabiel en hebben een relatief korte halfwaardetijd (de meeste minder dan een seconde). In de natuur komen sporen van de radio-isotopen $^{218}$Rn, $^{219}$Rn, $^{220}$Rn (ook wel thoron genoemd) en $^{222}$Rn voor.
De kortstlevende isotoop van radon is $^{196}$Rn, met een halfwaardetijd van ongeveer 4,7 milliseconden. De langstlevende is $^{222}$Rn, met een halfwaardetijd van 3,823 dagen.

## Overzicht

| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | VP | Kernspin | Isotopische verhouding (molfractie) |
| Natuurlijk voorkomen (molfractie) |||
| $^{195}$Rn | 86 | 109 | 195,00544(5) | 6 ms | | | 3/2$^−$ | |
| $^{195m}$Rn | 50(50) keV | 50(50) keV | 50(50) keV | 6 ms | | | 13/2$^+$ | |
| $^{196}$Rn | 86 | 110 | 196,002115(16) | 4,7(11) ms | α | $^{192}$Po | 0$^+$ | |
| $^{196}$Rn | 86 | 110 | 196,002115(16) | 4,7(11) ms | β$^+$ (zelden) | $^{196}$At | 0$^+$ | |
| $^{197}$Rn | 86 | 111 | 197,00158(7) | 66(16) ms | α | $^{193}$Po | 3/2$^−$ | |
| $^{197}$Rn | 86 | 111 | 197,00158(7) | 66(16) ms | β$^+$ (zelden) | $^{197}$At | 3/2$^−$ | |
| $^{197m}$Rn | 200(60) keV | 200(60) keV | 200(60) keV | 21(5) ms | α | $^{193}$Po | (13/2$^+$) | |
| $^{197m}$Rn | 200(60) keV | 200(60) keV | 200(60) keV | 21(5) ms | β$^+$ (zelden) | $^{197}$At | (13/2$^+$) | |
| $^{198}$Rn | 86 | 112 | 197,998679(14) | 65(3) ms | α (99%) | $^{194}$Po | 0$^+$ | |
| $^{198}$Rn | 86 | 112 | 197,998679(14) | 65(3) ms | β$^+$ (1%) | $^{198}$At | 0$^+$ | |
| $^{199}$Rn | 86 | 113 | 198,99837(7) | 620(30) ms | α (94%) | $^{195}$Po | 3/2$^−$ | |
| $^{199}$Rn | 86 | 113 | 198,99837(7) | 620(30) ms | β$^+$ (6%) | $^{199}$At | 3/2$^−$ | |
| $^{199m}$Rn | 180(70) keV | 180(70) keV | 180(70) keV | 320(20) ms | α (97%) | $^{195}$Po | 13/2$^+$ | |
| $^{199m}$Rn | 180(70) keV | 180(70) keV | 180(70) keV | 320(20) ms | β$^+$ (3%) | $^{199}$At | 13/2$^+$ | |
| $^{200}$Rn | 86 | 114 | 199,995699(14) | 0,96(3) s | α (98%) | $^{196}$Po | 0$^+$ | |
| $^{200}$Rn | 86 | 114 | 199,995699(14) | 0,96(3) s | β$^+$ (2%) | $^{200}$At | 0$^+$ | |
| $^{201}$Rn | 86 | 115 | 200,99563(8) | 7,0(4) s | α (80%) | $^{197}$Po | (3/2$^−$) | |
| $^{201}$Rn | 86 | 115 | 200,99563(8) | 7,0(4) s | β$^+$ (20%) | $^{201}$At | (3/2$^−$) | |
| $^{201m}$Rn | 280(90) keV | 280(90) keV | 280(90) keV | 3,8(1) s | α (90%) | $^{197}$Po | (13/2$^+$) | |
| $^{201m}$Rn | 280(90) keV | 280(90) keV | 280(90) keV | 3,8(1) s | β$^+$ (10%) | $^{201}$At | (13/2$^+$) | |
| $^{201m}$Rn | 280(90) keV | 280(90) keV | 280(90) keV | 3,8(1) s | IT (< 1%) | $^{201}$Rn | (13/2$^+$) | |
| $^{202}$Rn | 86 | 116 | 201,993263(19) | 9,94(18) s | α (85%) | $^{198}$Po | 0$^+$ | |
| $^{202}$Rn | 86 | 116 | 201,993263(19) | 9,94(18) s | β$^+$ (15%) | $^{202}$At | 0$^+$ | |
| $^{203}$Rn | 86 | 117 | 202,993387(25) | 44,2(16) s | α (66%) | $^{199}$Po | (3/2$^−$) | |
| $^{203}$Rn | 86 | 117 | 202,993387(25) | 44,2(16) s | β$^+$ (34%) | $^{203}$At | (3/2$^−$) | |
| $^{203m}$Rn | 363(4) keV | 363(4) keV | 363(4) keV | 26,7(5) s | α (80%) | $^{199}$Po | 13/2$^+$ | |
| $^{203m}$Rn | 363(4) keV | 363(4) keV | 363(4) keV | 26,7(5) s | β$^+$ (20%) | $^{203}$At | 13/2$^+$ | |
| $^{204}$Rn | 86 | 118 | 203,991429(16) | 1,17(18) min | α (73%) | $^{200}$Po | 0$^+$ | |
| $^{204}$Rn | 86 | 118 | 203,991429(16) | 1,17(18) min | β$^+$ (27%) | $^{204}$At | 0$^+$ | |
| $^{205}$Rn | 86 | 119 | 204,99172(5) | 170(4) s | β$^+$ (77%) | $^{205}$At | 5/2$^−$ | |
| $^{205}$Rn | 86 | 119 | 204,99172(5) | 170(4) s | α (23%) | $^{201}$Po | 5/2$^−$ | |
| $^{206}$Rn | 86 | 120 | 205,990214(16) | 5,67(17) min | α (62%) | $^{202}$Po | 0$^+$ | |
| $^{206}$Rn | 86 | 120 | 205,990214(16) | 5,67(17) min | β$^+$ (38%) | $^{206}$At | 0$^+$ | |
| $^{207}$Rn | 86 | 121 | 206,990734(28) | 9,25(17) min | β$^+$ (79%) | $^{207}$At | 5/2$^−$ | |
| $^{207}$Rn | 86 | 121 | 206,990734(28) | 9,25(17) min | α (21%) | $^{203}$Po | 5/2$^−$ | |
| $^{207m}$Rn | 899,0(10) keV | 899,0(10) keV | 899,0(10) keV | 181(18) µs | | | (13/2$^+$) | |
| $^{208}$Rn | 86 | 122 | 207,989642(12) | 24,35(14) min | α (62%) | $^{204}$Po | 0$^+$ | |
| $^{208}$Rn | 86 | 122 | 207,989642(12) | 24,35(14) min | β$^+$ (38%) | $^{208}$At | 0$^+$ | |
| $^{209}$Rn | 86 | 123 | 208,990415(21) | 28,5(10) min | β$^+$ (83%) | $^{209}$At | 5/2$^−$ | |
| $^{209}$Rn | 86 | 123 | 208,990415(21) | 28,5(10) min | α (17%) | $^{205}$Po | 5/2$^−$ | |
| $^{209m1}$Rn | 1173,98(13) keV | 1173,98(13) keV | 1173,98(13) keV | 13,4(13) µs | | | 13/2$^+$ | |
| $^{209m2}$Rn | 3636,78(23) keV | 3636,78(23) keV | 3636,78(23) keV | 3,0(3) µs | | | (35/2$^+$) | |
| $^{210}$Rn | 86 | 124 | 209,989696(9) | 2,4(1) uur | α (96%) | $^{206}$Po | 0$^+$ | |
| $^{210}$Rn | 86 | 124 | 209,989696(9) | 2,4(1) uur | β$^+$ (4%) | $^{210}$At | 0$^+$ | |
| $^{210m1}$Rn | 1690(15) keV | 1690(15) keV | 1690(15) keV | 644(40) ns | | | 8$^+$ | |
| $^{210m2}$Rn | 3837(15) keV | 3837(15) keV | 3837(15) keV | 1,06(5) µs | | | 17$^−$ | |
| $^{210m3}$Rn | 6493(15) keV | 6493(15) keV | 6493(15) keV | 1,04(7) µs | | | 22$^+$ | |
| $^{211}$Rn | 86 | 125 | 210,990601(7) | 14,6(2) uur | α (72,6%) | $^{207}$Po | 1/2$^−$ | |
| $^{211}$Rn | 86 | 125 | 210,990601(7) | 14,6(2) uur | β$^+$ (27,4%) | $^{211}$At | 1/2$^−$ | |
| $^{212}$Rn | 86 | 126 | 211,990704(3) | 23,9(12) min | α | $^{208}$Po | 0$^+$ | |
| $^{212}$Rn | 86 | 126 | 211,990704(3) | 23,9(12) min | β$^+$β$^+$ (zelden) | $^{212}$Po | 0$^+$ | |
| $^{213}$Rn | 86 | 127 | 212,993883(6) | 19,5(1) ms | α | $^{209}$Po | (9/2$^+$) | |
| $^{214}$Rn | 86 | 128 | 213,995363(10) | 0,27(2) µs | α | $^{210}$Po | 0$^+$ | |
| $^{214}$Rn | 86 | 128 | 213,995363(10) | 0,27(2) µs | β$^+$β$^+$ (zelden) | $^{214}$Po | 0$^+$ | |
| $^{214m}$Rn | 4595,4 keV | 4595,4 keV | 4595,4 keV | 245(30) ns | | | (22$^+$) | |
| $^{215}$Rn | 86 | 129 | 214,998745(8) | 2,30(10) µs | α | $^{211}$Po | 9/2$^+$ | |
| $^{216}$Rn | 86 | 130 | 216,000274(8) | 45(5) µs | α | $^{212}$Po | 0$^+$ | |
| $^{217}$Rn | 86 | 131 | 217,003928(5) | 0,54(5) ms | α | $^{213}$Po | 9/2$^+$ | |
| $^{218}$Rn | 86 | 132 | 218,0056013(25) | 35(5) ms | α | $^{214}$Po | 0$^+$ | sporen |
| $^{219}$Rn | 86 | 133 | 219,0094802(27) | 3,96(1) s | α | $^{215}$Po | 5/2$^+$ | sporen |
| $^{220}$Rn | 86 | 134 | 220,0113940(24) | 55,6(1) s | α | $^{216}$Po | 0$^+$ | sporen |
| $^{220}$Rn | 86 | 134 | 220,0113940(24) | 55,6(1) s | β$^−$β$^−$ (zelden) | $^{220}$Ra | 0$^+$ | sporen |
| $^{221}$Rn | 86 | 135 | 221,015537(6) | 25,7(5) min | β$^−$ (78%) | $^{221}$Fr | 7/2($^+$) | |
| $^{221}$Rn | 86 | 135 | 221,015537(6) | 25,7(5) min | α (22%) | $^{217}$Po | 7/2($^+$) | |
| $^{222}$Rn | 86 | 136 | 222,0175777(25) | 3,8235(3) dagen | α | $^{218}$Po | 0$^+$ | sporen |
| $^{223}$Rn | 86 | 137 | 223,02179(32) | 24,3(4) min | β$^−$ | $^{223}$Fr | 7/2 | |
| $^{224}$Rn | 86 | 138 | 224,02409(32) | 107(3) min | β$^−$ | $^{224}$Fr | 0$^+$ | |
| $^{225}$Rn | 86 | 139 | 225,02844(32) | 4,66(4) min | β$^−$ | $^{225}$Fr | 7/2$^−$ | |
| $^{226}$Rn | 86 | 140 | 226,03089(43) | 7,4(1) min | β$^−$ | $^{226}$Fr | 0$^+$ | |
| $^{227}$Rn | 86 | 141 | 227,03541(45) | 20,8(7) s | β$^−$ | $^{227}$Fr | 5/2$^+$ | |
| $^{228}$Rn | 86 | 142 | 228,03799(44) | 65(2) s | β$^−$ | $^{228}$Fr | 0$^+$ | |
| $^{229}$Rn | 86 | 143 | 229,0426536(141) | 12 s | | | | |

## 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
$^{193}$Rn · $^{194}$Rn · $^{195}$Rn · $^{195m}$Rn · $^{196}$Rn · $^{197}$Rn · $^{197m}$Rn · $^{198}$Rn · $^{199}$Rn · $^{199m}$Rn · $^{200}$Rn · $^{201}$Rn · $^{201m}$Rn · $^{202}$Rn · $^{203}$Rn · $^{203m}$Rn · $^{204}$Rn · $^{205}$Rn · $^{206}$Rn · $^{207}$Rn · $^{207m}$Rn · $^{208}$Rn · $^{209}$Rn · $^{209m1}$Rn · $^{209m2}$Rn · $^{210}$Rn · $^{210m1}$Rn · $^{210m2}$Rn · $^{210m3}$Rn · $^{211}$Rn · $^{212}$Rn · $^{213}$Rn · $^{214}$Rn · $^{214m}$Rn · $^{215}$Rn · $^{216}$Rn · $^{217}$Rn · $^{218}$Rn · $^{219}$Rn · $^{220}$Rn · $^{221}$Rn · $^{222}$Rn · $^{223}$Rn · $^{224}$Rn · $^{225}$Rn · $^{226}$Rn · $^{227}$Rn · $^{228}$Rn · $^{229}$Rn · $^{230}$Rn · $^{231}$Rn