Isotopes of radon

There are 39 known isotopes of radon (86Rn), from 193Rn to 231Rn; all are radioactive. The most stable isotope is 222Rn with a half-life of 3.823 days, which decays into 218Polonium. Six isotopes of radon, 217, 218, 219, 220, 221, 222Rn, occur in trace quantities in nature as decay products of, respectively, 217At, 218At, 223Ra, 224Ra, 225Ra, and 226Ra. 217Rn and 221Rn are produced in rare branches in the decay chain of trace quantities of 237Np; 222Rn (and also 218Rn in a rare branch) is an intermediate step in the decay chain of 238U; 219Rn is an intermediate step in the decay chain of 235U; and 220Rn occurs in the decay chain of 232Th.

List of isotopes

 * 193Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 107
 * 1.15(27) ms
 * α
 * 189Po
 * 194Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 108
 * 0.78(16) ms
 * α
 * 190Po
 * 0+
 * 195Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 109
 * 195.00544(5)
 * α
 * 191Po
 * (3/2−)
 * style="text-indent:1em" | 195mRn
 * colspan="3" style="text-indent:2em" | ~59 keV
 * α
 * 191Po
 * (13/2+)
 * rowspan=2|196Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 110
 * rowspan=2|196.002115(16)
 * rowspan=2|4.7(11) ms [4.4(+13−9) ms]
 * α
 * 192Po
 * rowspan=2|0+
 * rowspan=2|
 * β+ (rare)
 * 196At
 * rowspan=2|197Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 111
 * rowspan=2|197.00158(7)
 * rowspan=2|66(16) ms [65(+23−14) ms]
 * α
 * 193Po
 * rowspan=2|3/2−#
 * rowspan=2|
 * β+ (rare)
 * 197At
 * rowspan=2 style="text-indent:1em" | 197mRn
 * rowspan=2|
 * rowspan=2 colspan="3" style="text-indent:2em" | 200(60)# keV
 * rowspan=2|21(5) ms [19(+8−4) ms]
 * α
 * 193Po
 * rowspan=2|(13/2+)
 * rowspan=2|
 * β+ (rare)
 * 197At
 * rowspan=2|198Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 112
 * rowspan=2|197.998679(14)
 * rowspan=2|65(3) ms
 * α (99%)
 * 194Po
 * rowspan=2|0+
 * rowspan=2|
 * β+ (1%)
 * 198At
 * rowspan=2|199Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 113
 * rowspan=2|198.99837(7)
 * rowspan=2|620(30) ms
 * α (94%)
 * 195Po
 * rowspan=2|3/2−#
 * rowspan=2|
 * β+ (6%)
 * 199At
 * rowspan=2 style="text-indent:1em" | 199mRn
 * rowspan=2|
 * rowspan=2 colspan="3" style="text-indent:2em" | 180(70) keV
 * rowspan=2|320(20) ms
 * α (97%)
 * 195Po
 * rowspan=2|13/2+#
 * rowspan=2|
 * β+ (3%)
 * 199At
 * rowspan=2|200Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 114
 * rowspan=2|199.995699(14)
 * rowspan=2|0.96(3) s
 * α (98%)
 * 196Po
 * rowspan=2|0+
 * rowspan=2|
 * β+ (2%)
 * 200At
 * rowspan=2|201Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 115
 * rowspan=2|200.99563(8)
 * rowspan=2|7.0(4) s
 * α (80%)
 * 197Po
 * rowspan=2|(3/2−)
 * rowspan=2|
 * β+ (20%)
 * 201At
 * rowspan=3 style="text-indent:1em" | 201mRn
 * rowspan=3|
 * rowspan=3 colspan="3" style="text-indent:2em" | 280(90)# keV
 * rowspan=3|3.8(1) s
 * α (90%)
 * 197Po
 * rowspan=3|(13/2+)
 * rowspan=3|
 * β+ (10%)
 * 201At
 * IT (<1%)
 * 201Rn
 * rowspan=2|202Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 116
 * rowspan=2|201.993263(19)
 * rowspan=2|9.94(18) s
 * α (85%)
 * 198Po
 * rowspan=2|0+
 * rowspan=2|
 * β+ (15%)
 * 202At
 * rowspan=2|203Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 117
 * rowspan=2|202.993387(25)
 * rowspan=2|44.2(16) s
 * α (66%)
 * 199Po
 * rowspan=2|(3/2−)
 * rowspan=2|
 * β+ (34%)
 * 203At
 * rowspan=2 style="text-indent:1em" | 203mRn
 * rowspan=2|
 * rowspan=2 colspan="3" style="text-indent:2em" | 363(4) keV
 * rowspan=2|26.7(5) s
 * α (80%)
 * 199Po
 * rowspan=2|13/2(+)
 * rowspan=2|
 * β+ (20%)
 * 203At
 * rowspan=2|204Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 118
 * rowspan=2|203.991429(16)
 * rowspan=2|1.17(18) min
 * α (73%)
 * 200Po
 * rowspan=2|0+
 * rowspan=2|
 * β+ (27%)
 * 204At
 * rowspan=2|205Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 119
 * rowspan=2|204.99172(5)
 * rowspan=2|170(4) s
 * β+ (77%)
 * 205At
 * rowspan=2|5/2−
 * rowspan=2|
 * α (23%)
 * 201Po
 * rowspan=2|206Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 120
 * rowspan=2|205.990214(16)
 * rowspan=2|5.67(17) min
 * α (62%)
 * 202Po
 * rowspan=2|0+
 * rowspan=2|
 * β+ (38%)
 * 206At
 * rowspan=2|207Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 121
 * rowspan=2|206.990734(28)
 * rowspan=2|9.25(17) min
 * β+ (79%)
 * 207At
 * rowspan=2|5/2−
 * rowspan=2|
 * α (21%)
 * 203Po
 * style="text-indent:1em" | 207mRn
 * colspan="3" style="text-indent:2em" | 899.0(10) keV
 * 181(18) μs
 * (13/2+)
 * rowspan=2|208Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 122
 * rowspan=2|207.989642(12)
 * rowspan=2|24.35(14) min
 * α (62%)
 * 204Po
 * rowspan=2|0+
 * rowspan=2|
 * β+ (38%)
 * 208At
 * rowspan=2|209Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 123
 * rowspan=2|208.990415(21)
 * rowspan=2|28.5(10) min
 * β+ (83%)
 * 209At
 * rowspan=2|5/2−
 * rowspan=2|
 * α (17%)
 * 205Po
 * style="text-indent:1em" | 209m1Rn
 * colspan="3" style="text-indent:2em" | 1173.98(13) keV
 * 13.4(13) μs
 * 13/2+
 * style="text-indent:1em" | 209m2Rn
 * colspan="3" style="text-indent:2em" | 3636.78(23) keV
 * 3.0(3) μs
 * (35/2+)
 * rowspan=2|210Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 124
 * rowspan=2|209.989696(9)
 * rowspan=2|2.4(1) h
 * α (96%)
 * 206Po
 * rowspan=2|0+
 * rowspan=2|
 * β+ (4%)
 * 210At
 * style="text-indent:1em" | 210m1Rn
 * colspan="3" style="text-indent:2em" | 1690(15) keV
 * 644(40) ns
 * 8+#
 * style="text-indent:1em" | 210m2Rn
 * colspan="3" style="text-indent:2em" | 3837(15) keV
 * 1.06(5) μs
 * (17)−
 * style="text-indent:1em" | 210m3Rn
 * colspan="3" style="text-indent:2em" | 6493(15) keV
 * 1.04(7) μs
 * (22)+
 * rowspan=2|211Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 125
 * rowspan=2|210.990601(7)
 * rowspan=2|14.6(2) h
 * α (72.6%)
 * 207Po
 * rowspan=2|1/2−
 * rowspan=2|
 * β+ (27.4%)
 * 211At
 * 212Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 126
 * 211.990704(3)
 * 23.9(12) min
 * α
 * 208Po
 * 0+
 * 213Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 127
 * 212.993883(6)
 * 19.5(1) ms
 * α
 * 209Po
 * (9/2+)
 * 214Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 128
 * 213.995363(10)
 * 0.27(2) μs
 * α
 * 210Po
 * 0+
 * style="text-indent:1em" | 214mRn
 * colspan="3" style="text-indent:2em" | 4595.4 keV
 * 245(30) ns
 * IT
 * 214Rn
 * (22+)
 * 215Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 129
 * 214.998745(8)
 * 2.30(10) μs
 * α
 * 211Po
 * 9/2+
 * 216Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 130
 * 216.000274(8)
 * 45(5) μs
 * α
 * 212Po
 * 0+
 * 217Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 131
 * 217.003928(5)
 * 0.54(5) ms
 * α
 * 213Po
 * 9/2+
 * Trace
 * 218Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 132
 * 218.0056013(25)
 * 35(5) ms
 * α
 * 214Po
 * 0+
 * Trace
 * 219Rn
 * Actinon Actinium emanation
 * style="text-align:right" | 86
 * style="text-align:right" | 133
 * 219.0094802(27)
 * 3.96(1) s
 * α
 * 215Po
 * 5/2+
 * Trace
 * 220Rn
 * Thoron Thorium emanation
 * style="text-align:right" | 86
 * style="text-align:right" | 134
 * 220.0113940(24)
 * 55.6(1) s
 * α
 * 216Po
 * 0+
 * Trace
 * rowspan=2|221Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 135
 * rowspan=2|221.015537(6)
 * rowspan=2|25.7(5) min
 * β− (78%)
 * 221Fr
 * rowspan=2|7/2(+)
 * rowspan=2|Trace
 * α (22%)
 * 217Po
 * 222Rn
 * Radon Radium emanation Emanation Emanon Niton
 * style="text-align:right" | 86
 * style="text-align:right" | 136
 * 222.0175777(25)
 * 3.8235(3) d
 * α
 * 218Po
 * 0+
 * Trace
 * 223Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 137
 * 223.02179(32)#
 * 24.3(4) min
 * β−
 * 223Fr
 * 7/2
 * 224Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 138
 * 224.02409(32)#
 * 107(3) min
 * β−
 * 224Fr
 * 0+
 * 225Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 139
 * 225.02844(32)#
 * 4.66(4) min
 * β−
 * 225Fr
 * 7/2−
 * 226Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 140
 * 226.03089(43)#
 * 7.4(1) min
 * β−
 * 226Fr
 * 0+
 * 227Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 141
 * 227.03541(45)#
 * 20.8(7) s
 * β−
 * 227Fr
 * 5/2(+#)
 * 228Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 142
 * 228.03799(44)#
 * 65(2) s
 * β−
 * 228Fr
 * 0+
 * 229Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 143
 * 229.0426536(141)
 * 12(1) s
 * β−
 * 229Fr
 * 230Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 144
 * β−
 * 230Fr
 * 0+
 * 231Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 145
 * β−
 * 231Fr
 * 0+
 * Trace
 * 219Rn
 * Actinon Actinium emanation
 * style="text-align:right" | 86
 * style="text-align:right" | 133
 * 219.0094802(27)
 * 3.96(1) s
 * α
 * 215Po
 * 5/2+
 * Trace
 * 220Rn
 * Thoron Thorium emanation
 * style="text-align:right" | 86
 * style="text-align:right" | 134
 * 220.0113940(24)
 * 55.6(1) s
 * α
 * 216Po
 * 0+
 * Trace
 * rowspan=2|221Rn
 * rowspan=2|
 * rowspan=2 style="text-align:right" | 86
 * rowspan=2 style="text-align:right" | 135
 * rowspan=2|221.015537(6)
 * rowspan=2|25.7(5) min
 * β− (78%)
 * 221Fr
 * rowspan=2|7/2(+)
 * rowspan=2|Trace
 * α (22%)
 * 217Po
 * 222Rn
 * Radon Radium emanation Emanation Emanon Niton
 * style="text-align:right" | 86
 * style="text-align:right" | 136
 * 222.0175777(25)
 * 3.8235(3) d
 * α
 * 218Po
 * 0+
 * Trace
 * 223Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 137
 * 223.02179(32)#
 * 24.3(4) min
 * β−
 * 223Fr
 * 7/2
 * 224Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 138
 * 224.02409(32)#
 * 107(3) min
 * β−
 * 224Fr
 * 0+
 * 225Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 139
 * 225.02844(32)#
 * 4.66(4) min
 * β−
 * 225Fr
 * 7/2−
 * 226Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 140
 * 226.03089(43)#
 * 7.4(1) min
 * β−
 * 226Fr
 * 0+
 * 227Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 141
 * 227.03541(45)#
 * 20.8(7) s
 * β−
 * 227Fr
 * 5/2(+#)
 * 228Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 142
 * 228.03799(44)#
 * 65(2) s
 * β−
 * 228Fr
 * 0+
 * 229Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 143
 * 229.0426536(141)
 * 12(1) s
 * β−
 * 229Fr
 * 230Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 144
 * β−
 * 230Fr
 * 0+
 * 231Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 145
 * β−
 * 231Fr
 * 65(2) s
 * β−
 * 228Fr
 * 0+
 * 229Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 143
 * 229.0426536(141)
 * 12(1) s
 * β−
 * 229Fr
 * 230Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 144
 * β−
 * 230Fr
 * 0+
 * 231Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 145
 * β−
 * 231Fr
 * β−
 * 230Fr
 * 0+
 * 231Rn
 * style="text-align:right" | 86
 * style="text-align:right" | 145
 * β−
 * 231Fr
 * style="text-align:right" | 86
 * style="text-align:right" | 145
 * β−
 * 231Fr
 * β−
 * 231Fr