砈有從 191At 到 223At 共 33 個已知的同位素，都具有放射性。砈最穩定的同位素是半衰期 81 小時的 210At，而如果只看存在於天然衰變鏈的同位素，那麼砈最穩定的同位素就是半衰期 56 秒的 219At。 圖表 191At styletextalignright 85 styletextalignright 106 17 115 ms 12 styletextindent1em 191mAt colspan3 styletextindent2em 21 43 ms 72 193At styletextalignright 85 styletextalignright 108 19299984 6 28 54 ms 189Bi 12 styletextindent1em 193m1At colspan3 styletextindent2em 50 keV 21 5 ms 72 styletextindent1em 193m2At colspan3 styletextindent2em 39 keV 27 45 ms 132 rowspan2194At rowspan2 styletextalignright 85 rowspan2 styletextalignright 109 rowspan219399873 20 rowspan240 ms 190Bi rowspan23 rowspan2 （不常見） 194Po rowspan2 styletextindent1em 194mAt rowspan2 colspan3 styletextindent2em 480 190 keV rowspan2250 ms 190Bi rowspan210 rowspan2 IT （不常見） 194At rowspan2195At rowspan2 styletextalignright 85 rowspan2 styletextalignright 110 rowspan2194996268 10 rowspan2328 20 ms 75 191Bi rowspan212 rowspan2 25 195Po styletextindent1em 195mAt colspan3 styletextindent2em 34 7 keV 147 5 ms 92 rowspan2196At rowspan2 styletextalignright 85 rowspan2 styletextalignright 111 rowspan219599579 6 rowspan2253 9 ms 96 192Bi rowspan23 rowspan2 40 196Po styletextindent1em 196m1At colspan3 styletextindent2em 30 80 keV 20 ms 10 styletextindent1em 196m2At colspan3 styletextindent2em 1579 1 keV 11 µs 5 rowspan2197At rowspan2 styletextalignright 85 rowspan2 styletextalignright 112 rowspan219699319 5 rowspan20390 16 s 96 193Bi rowspan292 rowspan2 40 197Po styletextindent1em 197mAt colspan3 styletextindent2em 52 10 keV 20 2 s 12 rowspan2198At rowspan2 styletextalignright 85 rowspan2 styletextalignright 113 rowspan219799284 5 rowspan242 3 s 94 194Bi rowspan23 rowspan2 6 198Po styletextindent1em 198mAt colspan3 styletextindent2em 330 90 keV 10 2 s 10 rowspan2199At rowspan2 styletextalignright 85 rowspan2 styletextalignright 114 rowspan219899053 5 rowspan2692 13 s 89 195Bi rowspan292 rowspan2 11 199Po rowspan2200At rowspan2 styletextalignright 85 rowspan2 styletextalignright 115 rowspan2199990351 26 rowspan2432 9 s 57 196Bi rowspan23 rowspan2 43 200Po rowspan3 styletextindent1em 200m1At rowspan3 colspan3 styletextindent2em 1127 30 keV rowspan347 1 s 43 196Bi rowspan37 rowspan3 IT 200At 200Po styletextindent1em 200m2At colspan3 styletextindent2em 344 3 keV 35 2 s 10 rowspan2201At rowspan2 styletextalignright 85 rowspan2 styletextalignright 116 rowspan2200988417 9 rowspan285 3 s 71 197Bi rowspan292 rowspan2 29 201Po rowspan2202At rowspan2 styletextalignright 85 rowspan2 styletextalignright 117 rowspan220198863 3 rowspan2184 1 s 88 202Po rowspan223 rowspan2 12 198Bi styletextindent1em 202m1At colspan3 styletextindent2em 190 40 keV 182 2 s 7 styletextindent1em 202m2At colspan3 styletextindent2em 580 40 keV 460 50 ms 10 rowspan2203At rowspan2 styletextalignright 85 rowspan2 styletextalignright 118 rowspan2202986942 13 rowspan2737 13 min 69 203Po rowspan292 rowspan2 31 199Bi rowspan2204At rowspan2 styletextalignright 85 rowspan2 styletextalignright 119 rowspan2203987251 26 rowspan292 2 min 96 204Po rowspan27 rowspan2 38 200Bi styletextindent1em 204mAt colspan3 styletextindent2em 58730 20 keV 108 10 ms IT 204At 10 rowspan2205At rowspan2 styletextalignright 85 rowspan2 styletextalignright 120 rowspan2204986074 16 rowspan2262 5 min 90 205Po rowspan292 rowspan2 10 201Bi styletextindent1em 205mAt colspan3 styletextindent2em 233965 23 keV 776 14 µs 292 rowspan2206At rowspan2 styletextalignright 85 rowspan2 styletextalignright 121 rowspan2205986667 22 rowspan2306 13 min 9911 206Po rowspan25 rowspan2 09 202Bi styletextindent1em 206mAt colspan3 styletextindent2em 807 3 keV 410 80 ns 10 rowspan2207At rowspan2 styletextalignright 85 rowspan2 styletextalignright 122 rowspan2206985784 23 rowspan2180 4 h 91 207Po rowspan292 rowspan2 86 203Bi rowspan2208At rowspan2 styletextalignright 85 rowspan2 styletextalignright 123 rowspan2207986590 28 rowspan2163 3 h 995 208Po rowspan26 rowspan2 055 204Bi rowspan2209At rowspan2 styletextalignright 85 rowspan2 styletextalignright 124 rowspan2208986173 8 rowspan2541 5 h 96 209Po rowspan292 rowspan2 40 205Bi rowspan2210At rowspan2 styletextalignright 85 rowspan2 styletextalignright 125 rowspan2209987148 8 rowspan281 4 h 998 210Po rowspan25 rowspan2 018 206Bi styletextindent1em 210m1At colspan3 styletextindent2em 25496 2 keV 482 6 µs 15 styletextindent1em 210m2At colspan3 styletextindent2em 40277 2 keV 566 7 µs 19 rowspan2211At rowspan2 styletextalignright 85 rowspan2 styletextalignright 126 rowspan22109874963 30 rowspan27214 7 h 582 211Po rowspan292 rowspan2 42 207Bi rowspan3212At rowspan3 styletextalignright 85 rowspan3 styletextalignright 127 rowspan3211990745 8 rowspan30314 2 s 9995 208Bi rowspan31 rowspan3 005 212Po 2106 212Rn rowspan2 styletextindent1em 212m1At rowspan2 colspan3 styletextindent2em 223 7 keV rowspan20119 3 s 99 208Bi rowspan29 rowspan2 IT 1 212At styletextindent1em 212m2At colspan3 styletextindent2em 47716 11 keV 152 5 µs 25 213At styletextalignright 85 styletextalignright 128 212992937 5 125 6 ns 209Bi 92 214At styletextalignright 85 styletextalignright 129 213996372 5 558 10 ns 210Bi 1 styletextindent1em 214m1At colspan3 styletextindent2em 59 9 keV 265 30 ns styletextindent1em 214m2At colspan3 styletextindent2em 231 6 keV 760 15 ns 9 215At styletextalignright 85 styletextalignright 130 214998653 7 010 2 ms 211Bi 92 痕量 235U 的衰變產物 rowspan3216At rowspan3 styletextalignright 85 rowspan3 styletextalignright 131 rowspan3216002423 4 rowspan3030 3 ms 9999 212Bi rowspan31 rowspan3 006 216Rn 3107 216Po styletextindent1em 216mAt colspan3 styletextindent2em 413 5 keV 100 µs 9 rowspan2217At rowspan2 styletextalignright 85 rowspan2 styletextalignright 132 rowspan2217004719 5 rowspan2323 4 ms 9998 213Bi rowspan292 rowspan2 痕量 237Np 的衰變產物 012 217Rn rowspan2218At rowspan2 styletextalignright 85 rowspan2 styletextalignright 133 rowspan2218008694 12 rowspan2127 6 s 999 214Bi rowspan21 rowspan2 痕量 238U 的衰變產物 010 218Rn rowspan2219At rowspan2 styletextalignright 85 rowspan2 styletextalignright 134 rowspan2219011162 4 rowspan256 3 s 97 215Bi rowspan292 rowspan2 痕量 30 219Rn rowspan2220At rowspan2 styletextalignright 85 rowspan2 styletextalignright 135 rowspan222001541 6 rowspan2371 4 min 92 220Rn rowspan23 rowspan2 80 216Bi 221At styletextalignright 85 styletextalignright 136 22101805 21 23 2 min 221Rn 32 222At styletextalignright 85 styletextalignright 137 22202233 32 54 10 s 222Rn 223At styletextalignright 85 styletextalignright 138 22302519 43 50 7 s 32 備註：畫上 號的資料代表沒有經過實驗的證明，只是理論推測而已，而用括號括起來的代表資料不確定性。 註釋 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 At Category 砈