Познати се 39 изотопи на радон (86Rn), од 193Rn до 231Rn, сите се радиоактивни. Најстабилен изотоп е 222Rn со време на полураспад од 3,8235 дена, кој се распаѓа на полониум-218. Шест изотопи на радонот, 217, 218, 219, 220, 221, 222Rn, се појавуваат во трагови во природата како распадни производи од, соодветно, 217At, 218At, 223Ra, 224Ra, 225Ra и 226Ra. 217Rn и 221Rn се произведуваат во ретки гранки во распадната низа на траги од 237Np, 222Rn (и исто така 218Rn во ретка гранка) е меѓучекор во распадната низа на 238</sup>U, 219Rn е меѓучекор во распадната низа на 235U, и 220Rn се јавува во распадната низа на <sup id="mwNg">232</sup>Th.
Список на изотопи
|-id=Радон-193
| 193Rn
| style="text-align:right" | 86
| style="text-align:right" | 107
| 193,009708(27)
| 1,15(27) ms
| α
| 189Po
| (3/2−)
|-id=Радон-194
| rowspan=2|194Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 108
| rowspan=2|194,006146(18)
| rowspan=2|0,78(16) ms
| α
| 190Po
| rowspan=2|0+
| rowspan=2|
| β+?
| 194At
|-id=Радон-195
| 195Rn
| style="text-align:right" | 86
| style="text-align:right" | 109
| 195,005422(55)
| 7(3) ms
| α
| 191Po
| 3/2−
|-id=Радон-195m
| style="text-indent:1em" | 195mRnРедоследот на основната состојба и изомерот е неизвесен.
| colspan="3" style="text-indent:2em" | 80(50) keV
| 6(3) ms
| α
| 191Po
| 13/2+
|-id=Радон-196
| rowspan=2|196Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 110
| rowspan=2|196,002120(15)
| rowspan=2|4,7(11) ms
| α
| 192Po
| rowspan=2|0+
| rowspan=2|
| β+?
| 196At
|-id=Радон-197
| rowspan=2|197Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 111
| rowspan=2|197,001621(17)
| rowspan=2|54(6) ms
| α
| 193Po
| rowspan=2|3/2−
| rowspan=2|
| β+?
| 197At
|-id=Радон-197m
| rowspan=2 style="text-indent:1em" | 197mRn
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 199(11) keV
| rowspan=2|25,6(25) ms
| α
| 193Po
| rowspan=2|13/2+
| rowspan=2|
| β+?
| 197At
|-id=Радон-198
| 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|64,4(16) ms
| α (93%)
| 194Po
| rowspan=2|0+
| rowspan=2|
| β+? (7%)
| 198At
|-id=Радон-199
| rowspan=2|199Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 113
| rowspan=2|198,9983254(78)
| rowspan=2|590(30) ms
| α
| 195Po
| rowspan=2|3/2−
| rowspan=2|
| β+?
| 199At
|-id=Радон-199m
| rowspan=3 style="text-indent:1em" | 199mRn
| rowspan=3|
| rowspan=3 colspan="3" style="text-indent:2em" | 220(11) keV
| rowspan=3|310(20) ms
| α
| 195Po
| rowspan=3|13/2+
| rowspan=3|
| β+?
| 199At
| IT?
| 199At
|-id=Радон-200
| rowspan=2|200Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 114
| rowspan=2|199,9957053(62)
| rowspan=2|1,09(16) s
| α (92%)
| 196Po
| rowspan=2|0+
| rowspan=2|
| β+? (8%)
| 200At
|-id=Радон-200m
| style="text-indent:1em" | 200mRn
| colspan="3" style="text-indent:2em" | 2320(20)# keV
| 28(9) μs
| IT
| 200Rn
|-id=Радон-201
| rowspan=2|201Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 115
| rowspan=2|200,995591(11)
| rowspan=2|7,0(4) s
| α
| 197Po
| rowspan=2|3/2−
| rowspan=2|
| β+?
| 201At
|-id=Радон-201m
| rowspan=2 style="text-indent:1em" | 201mRn
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 245(12) keV
| rowspan=2|3,8(1) s
| α
| 197Po
| rowspan=2|13/2+
| rowspan=2|
| β+?
| 201At
|-id=Радон-202
| rowspan=2|202Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 116
| rowspan=2|201,993264(19)
| rowspan=2|9,7(1) s
| α (78%)
| 198Po
| rowspan=2|0+
| rowspan=2|
| β+ (22%)
| 202At
|-id=Радон-202m
| style="text-indent:1em" | 202mRn
| colspan="3" style="text-indent:2em" | 2310(50)# keV
| 2,22(7) μs
| IT
| 202Rn
| 11−#
|-id=Радон-203
| rowspan=2|203Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 117
| rowspan=2|202,9933612(62)
| rowspan=2|44,2(16) s
| α (66%)
| 199Po
| rowspan=2|3/2−
| rowspan=2|
| β+ (34%)
| 203At
|-id=Радон-203m
| rowspan=2 style="text-indent:1em" | 203mRn
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 362(4) keV
| rowspan=2|26,9(5) s
| α (75%)
| 199Po
| rowspan=2|13/2+
| rowspan=2|
| β+ (25%)
| 203At
|-id=Радон-204
| rowspan=2|204Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 118
| rowspan=2|203,9914437(80)
| rowspan=2|1,242(23) min
| α (72,4%)
| 200Po
| rowspan=2|0+
| rowspan=2|
| β+ (27,6%)
| 204At
|-id=Радон-205
| rowspan=2|205Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 119
| rowspan=2|204,9917232(55)
| rowspan=2|170(4) s
| β+ (75,4%)
| 205At
| rowspan=2|5/2−
| rowspan=2|
| α (24,6%)
| 201Po
|-id=Радон-205m
| rowspan=3 style="text-indent:1em" | 205mRn
| rowspan=3|
| rowspan=3 colspan="3" style="text-indent:2em" | 657,1(5) keV
| rowspan=3|>10 s
| IT
| 205Rn
| rowspan=3|13/2+#
| rowspan=3|
| α?
| 201Po
| β+?
| 205At
|-id=Радон-206
| rowspan=2|206Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 120
| rowspan=2|205,9901954(92)
| rowspan=2|5,67(17) min
| α (62%)
| 202Po
| rowspan=2|0+
| rowspan=2|
| β+ (38%)
| 206At
|-id=Радон-207
| rowspan=2|207Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 121
| rowspan=2|206,9907302(51)
| rowspan=2|9,25(17) min
| β+ (79%)
| 207At
| rowspan=2|5/2−
| rowspan=2|
| α (21%)
| 203Po
|-id=Радон-207m
| style="text-indent:1em" | 207mRn
| colspan="3" style="text-indent:2em" | 899,1(10) keV
| 184,5(9) μs
| IT
| 207Rn
| 13/2+
|-id=Радон-208
| rowspan=2|208Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 122
| rowspan=2|207,989635(11)
| rowspan=2|24,35(14) min
| α (62%)
| 204Po
| rowspan=2|0+
| rowspan=2|
| β+ (38%)
| 208At
|-id=Радон-208m
| style="text-indent:1em" | 208mRn
| colspan="3" style="text-indent:2em" | 1828,3(4) keV
| 487(12) ns
| IT
| 208Rn
| 8+
|-id=Радон-209
| rowspan=2|209Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 123
| rowspan=2|208,990401(11)
| rowspan=2|28,8(10) min
| β+ (83%)
| 209At
| rowspan=2|5/2−
| rowspan=2|
| α (17%)
| 205Po
|-id=Радон-209m1
| style="text-indent:1em" | 209m1Rn
| colspan="3" style="text-indent:2em" | 1174,01(13) keV
| 13,4(13) μs
| IT
| 209Rn
| 13/2+
|-id=Радон-209m2
| style="text-indent:1em" | 209m2Rn
| colspan="3" style="text-indent:2em" | 3636,81(23) keV
| 3,0(3) μs
| IT
| 209Rn
| 35/2+
|-id=Радон-210
| rowspan=2|210Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 124
| rowspan=2|209,9896889(49)
| rowspan=2|2,4(1) h
| α (96%)
| 206Po
| rowspan=2|0+
| rowspan=2|
| β+ (4%)
| 210At
|-id=Радон-210m1
| style="text-indent:1em" | 210m1Rn
| colspan="3" style="text-indent:2em" | 1710(30) keV
| 644(40) ns
| IT
| 210Rn
| 8+
|-id=Радон-210m2
| style="text-indent:1em" | 210m2Rn
| colspan="3" style="text-indent:2em" | 3857(30) keV
| 1,06(5) μs
| IT
| 210Rn
| 17−
|-id=Радон-210m3
| style="text-indent:1em" | 210m3Rn
| colspan="3" style="text-indent:2em" | 6514(30) keV
| 1,04(7) μs
| IT
| 210Rn
| 23+
|-id=Радон-211
| rowspan=2|211Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 125
| rowspan=2|210,9906008(73)
| rowspan=2|14,6(2) h
| β+ (72,6%)
| 211At
| rowspan=2|1/2−
| rowspan=2|
| α (27,4%)
| 207Po
|-id=Радон-211m1
| style="text-indent:1em" | 211m1Rn
| colspan="3" style="text-indent:2em" | 1603(14)# keV
| 596(28) ns
| IT
| 211Rn
| 17/2−
|-id=Радон-211m2
| style="text-indent:1em" | 211m2Rn
| colspan="3" style="text-indent:2em" | 8905(20)# keV
| 201(4) ns
| IT
| 211Rn
| 63/2−
|-id=Радон-212
|212Rn
|style="text-align:right" | 86
|style="text-align:right" | 126
|211,9907039(33)
|23,9(12) min
| α
| 208Po
|0+
|-id=Радон-212m1
| style="text-indent:1em" | 212m1Rn
| colspan="3" style="text-indent:2em" | 1639,68(15) keV
| 118(14) ns
| IT
| 212Rn
| 6+
|-id=Радон-212m2
| style="text-indent:1em" | 212m2Rn
| colspan="3" style="text-indent:2em" | 1694,1(3) keV
| 910(30) ns
| IT
| 212Rn
| 8+
|-id=Радон-212m3
| style="text-indent:1em" | 212m3Rn
| colspan="3" style="text-indent:2em" | 6174,2(3) keV
| 102(4) ns
| IT
| 212Rn
| 22+
|-id=Радон-212m4
| style="text-indent:1em" | 212m4Rn
| colspan="3" style="text-indent:2em" | 8579,2(4) keV
| 154(14) ns
| IT
| 212Rn
| 30+
|-id=Радон-213
| 213Rn
| style="text-align:right" | 86
| style="text-align:right" | 127
| 212,9938851(36)
| 19,5(1) ms
| αТеоретски способен за електронски зафат во 213At}}
| 209Po
| 9/2+#
|-id=Радон-213m1
| style="text-indent:1em" | 213m1Rn
| colspan="3" style="text-indent:2em" | 1682(10) keV
| 1,00(21) μs
| IT
| 213Rn
| (25/2+)
|-id=Радон-213m2
| style="text-indent:1em" | 213m2Rn
| colspan="3" style="text-indent:2em" | 2205(10) keV
| 1,36(7) μs
| IT
| 213Rn
| (31/2−)
|-id=Радон-213m3
| style="text-indent:1em" | 213m3Rn
| colspan="3" style="text-indent:2em" | 5965(14) keV
| 164(11) ns
| IT
| 213Rn
| (55/2+)
|-id=Радон-214
|214Rn
| style="text-align:right" | 86
|style="text-align:right" | 128
|213,9953627(99)
|259(3) ns
| α
| 210Po
|0+
|-id=Радон-214m
| style="text-indent:1em" | 214mRn
| colspan="3" style="text-indent:2em" | 4595,4(18) keV
| 245(30) ns
|IT
|214Rn
| (22+)
|-id=Радон-215
| 215Rn
| style="text-align:right" | 86
| style="text-align:right" | 129
| 214,9987450(65)
| 2,30(10) μs
| α
| 211Po
| 9/2+
|-id=Радон-216
| 216Rn
| style="text-align:right" | 86
| style="text-align:right" | 130
| 216,0002719(62)
| 29(4) μs
| α
| 212Po
| 0+
|-id=Радон-217
| 217Rn
| style="text-align:right" | 86
| style="text-align:right" | 131
| 217,0039276(45)
| 593(38) μs
| α
| 213Po
| 9/2+
| Трагираспаден меѓупроизвод на 237Np
|-id=Радон-218
| 218Rn
| style="text-align:right" | 86
| style="text-align:right" | 132
| 218,0056011(25)
| 33,75(15) ms
| α
| 214Po
| 0+
| Траги распаден меѓупроизвод на 238U
|-id=Радон-219
| 219Rn
| АктинонЕманација на актиниум
| style="text-align:right" | 86
| style="text-align:right" | 133
| 219,0094787(23)
| 3,96(1) s
| α
| 215Po
| 5/2+
| ТрагиРаспаден меѓупроизвод на 235U
|-id=Радон-220
|220Rn
|ТоронЕманација на ториум
| style="text-align:right" | 86
| style="text-align:right" | 134
| 220,0113924(19)
|55,6(1) s
| α Теоретизирано дека исто така ќе претрпи β−β− распаѓање до 220Ra
| 216Po
|0+
|Трагираспаден меѓупроизвод на 232Th
|-id=Радон-221
| rowspan=2|221Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 135
| rowspan=2|221,0155356(61)
| rowspan=2|25,7(5) min
| β− (78%)
| 221Fr
| rowspan=2|7/2+
| rowspan=2|траги
| α (22%)
| 217Po
| 222Rn
| РадонИмето произлегува одРадиумова еманацијаЕманацијаЕманонНитон
| style="text-align:right" | 86
| style="text-align:right" | 136
| 222,0175760(21)
| 3,8215(2) d
| αТеоретизирано дека исто така ќе претрпи β− распаѓање до 222Fr и β−β− распаѓање до 222Ra
| 218Po
| 0+
| Траги
|-id=Радон-223
| rowspan=2|223Rn
| rowspan=2|
| rowspan=2 style="text-align:right" | 86
| rowspan=2 style="text-align:right" | 137
| rowspan=2|223,0218893(84)
| rowspan=2|24,3(4) min
| β−
| 223Fr
| rowspan=2|7/2+
| rowspan=2|
| α?
| 219Po
|-id=Радон-224
| 224Rn
| style="text-align:right" | 86