氡有 34 個已知的同位素，均具有放射性，其中最穩定的為 222Rn。 圖表 195Rn styletextalignright 86 styletextalignright 109 19500544 5 6 ms 32 styletextindent1em 195mRn colspan3 styletextindent2em 50 50 keV 6 ms 132 rowspan2196Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 110 rowspan2196002115 16 rowspan247 11 ms 44 139 ms 192Po rowspan20 rowspan2 （不常見） 196At rowspan2197Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 111 rowspan219700158 7 rowspan266 16 ms 65 2314 ms 193Po rowspan232 rowspan2 （不常見） 197At rowspan2 styletextindent1em 197mRn rowspan2 rowspan2 colspan3 styletextindent2em 200 60 keV rowspan221 5 ms 19 84 ms 193Po rowspan2132 rowspan2 （不常見） 197At rowspan2198Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 112 rowspan2197998679 14 rowspan265 3 ms 99 194Po rowspan20 rowspan2 1 198At rowspan2199Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 113 rowspan219899837 7 rowspan2620 30 ms 94 195Po rowspan232 rowspan2 6 199At rowspan2 styletextindent1em 199mRn rowspan2 rowspan2 colspan3 styletextindent2em 180 70 keV rowspan2320 20 ms 97 195Po rowspan2132 rowspan2 3 199At rowspan2200Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 114 rowspan2199995699 14 rowspan2096 3 s 98 196Po rowspan20 rowspan2 2 200At rowspan2201Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 115 rowspan220099563 8 rowspan270 4 s 80 197Po rowspan232 rowspan2 20 201At rowspan3 styletextindent1em 201mRn rowspan3 rowspan3 colspan3 styletextindent2em 280 90 keV rowspan338 1 s 90 197Po rowspan3132 rowspan3 10 201At IT 1 201Rn rowspan2202Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 116 rowspan2201993263 19 rowspan2994 18 s 85 198Po rowspan20 rowspan2 15 202At rowspan2203Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 117 rowspan2202993387 25 rowspan2442 16 s 66 199Po rowspan232 rowspan2 34 203At rowspan2 styletextindent1em 203mRn rowspan2 rowspan2 colspan3 styletextindent2em 363 4 keV rowspan2267 5 s 80 199Po rowspan2132 rowspan2 20 203At rowspan2204Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 118 rowspan2203991429 16 rowspan2117 18 min 73 200Po rowspan20 rowspan2 27 204At rowspan2205Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 119 rowspan220499172 5 rowspan2170 4 s 77 205At rowspan252 rowspan2 23 201Po rowspan2206Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 120 rowspan2205990214 16 rowspan2567 17 min 62 202Po rowspan20 rowspan2 38 206At rowspan2207Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 121 rowspan2206990734 28 rowspan2925 17 min 79 207At rowspan252 rowspan2 21 203Po styletextindent1em 207mRn colspan3 styletextindent2em 8990 10 keV 181 18 µs 132 rowspan2208Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 122 rowspan2207989642 12 rowspan22435 14 min 62 204Po rowspan20 rowspan2 38 208At rowspan2209Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 123 rowspan2208990415 21 rowspan2285 10 min 83 209At rowspan252 rowspan2 17 205Po styletextindent1em 209m1Rn colspan3 styletextindent2em 117398 13 keV 134 13 µs 132 styletextindent1em 209m2Rn colspan3 styletextindent2em 363678 23 keV 30 3 µs 352 rowspan2210Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 124 rowspan2209989696 9 rowspan224 1 h 96 206Po rowspan20 rowspan2 4 210At styletextindent1em 210m1Rn colspan3 styletextindent2em 1690 15 keV 644 40 ns 8 styletextindent1em 210m2Rn colspan3 styletextindent2em 3837 15 keV 106 5 µs 17 styletextindent1em 210m3Rn colspan3 styletextindent2em 6493 15 keV 104 7 µs 22 rowspan2211Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 125 rowspan2210990601 7 rowspan2146 2 h 726 207Po rowspan212 rowspan2 274 211At 212Rn styletextalignright 86 styletextalignright 126 211990704 3 239 12 min 208Po 0 213Rn styletextalignright 86 styletextalignright 127 212993883 6 195 1 ms 209Po 92 214Rn styletextalignright 86 styletextalignright 128 213995363 10 027 2 µs 210Po 0 styletextindent1em 214mRn colspan3 styletextindent2em 45954 keV 245 30 ns 22 215Rn styletextalignright 86 styletextalignright 129 214998745 8 230 10 µs 211Po 92 216Rn styletextalignright 86 styletextalignright 130 216000274 8 45 5 µs 212Po 0 217Rn styletextalignright 86 styletextalignright 131 217003928 5 054 5 ms 213Po 92 218Rn styletextalignright 86 styletextalignright 132 2180056013 25 35 5 ms 214Po 0 痕量 238U 的衰變產物 219Rn 錒射氣 styletextalignright 86 styletextalignright 133 2190094802 27 396 1 s 215Po 52 痕量 235U 的衰變產物 220Rn 釷射氣 styletextalignright 86 styletextalignright 134 2200113940 24 556 1 s 216Po 0 痕量 232Th 的衰變產物 rowspan2221Rn rowspan2 rowspan2 styletextalignright 86 rowspan2 styletextalignright 135 rowspan2221015537 6 rowspan2257 5 min 78 221Fr rowspan272 rowspan2 22 217Po 222Rn 鐳射氣 styletextalignright 86 styletextalignright 136 2220175777 25 38235 3 d 218Po 0 痕量 223Rn styletextalignright 86 styletextalignright 137 22302179 32 243 4 min 223Fr 72 224Rn styletextalignright 86 styletextalignright 138 22402409 32 107 3 min 224Fr 0 225Rn styletextalignright 86 styletextalignright 139 22502844 32 466 4 min 225Fr 72 226Rn styletextalignright 86 styletextalignright 140 22603089 43 74 1 min 226Fr 0 227Rn styletextalignright 86 styletextalignright 141 22703541 45 208 7 s 227Fr 52 228Rn styletextalignright 86 styletextalignright 142 22803799 44 65 2 s 228Fr 0 229Rn styletextalignright 86 styletextalignright 143 2290426536 141 12 s 參考文獻 Isotope masses from Ame2003 Atomic Mass Evaluation by G Audi AH Wapstra C Thibault J Blachot and O Bersillon in Nuclear Physics A729 2003 Halflife spin and isomer data selected from these sources Editing notes on this articles talk page Audi Bersillon Blachot Wapstra The Nubase2003 evaluation of nuclear and decay properties Nuc Phys A 729 pp 3128 2003 National Nuclear Data Center Brookhaven National Laboratory Information extracted from the NuDat 21 database retrieved Sept 2005 David R Lide ed Norman E Holden in CRC Handbook of Chemistry and Physics 85th Edition online version CRC Press Boca Raton Florida 2005 Section 11 Table of the Isotopes Rn