砈有从191At到223At共33个已知的同位素，都具有放射性。砹最稳定的同位素是半衰期8.1小时的210At，而如果只看存在于天然衰变链的同位素，那么砹最稳定的同位素就是半衰期56秒的219At。
圖表
|-
| 191At
| style="text-align:right" | 85
| style="text-align:right" | 106
|
| 1.7(+11−5) ms
|
|
| (1/2+)
|
|-
| style="text-indent:1em" | 191mAt
| colspan="3" style="text-indent:2em" |
| 2.1(+4−3) ms
|
|
| (7/2−)
|
|-
| 193At
| style="text-align:right" | 85
| style="text-align:right" | 108
| 192.99984(6)
| 28(+5−4) ms
|
| 189Bi
| (1/2+)
|
|-
| style="text-indent:1em" | 193m1At
| colspan="3" style="text-indent:2em" | 50 keV
| 21(5) ms
|
|
| (7/2−)
|
|-
| style="text-indent:1em" | 193m2At
| colspan="3" style="text-indent:2em" | 39 keV
| 27(+4−5) ms
|
|
| (13/2+)
|
|-
| rowspan=2|194At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 109
| rowspan=2|193.99873(20)
| rowspan=2|~40 ms
|
| 190Bi
| rowspan=2|3+#
| rowspan=2|
|-
| （不常見）
| 194Po
|-
| rowspan=2 style="text-indent:1em" | 194mAt
| rowspan=2 colspan="3" style="text-indent:2em" | 480(190) keV
| rowspan=2|~250 ms
|
| 190Bi
| rowspan=2|10−#
| rowspan=2|
|-
| IT （不常見）
| 194At
|-
| rowspan=2|195At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 110
| rowspan=2|194.996268(10)
| rowspan=2|328(20) ms
| (75%)
| 191Bi
| rowspan=2|(1/2+)
| rowspan=2|
|-
| (25%)
| 195Po
|-
| style="text-indent:1em" | 195mAt
| colspan="3" style="text-indent:2em" | 34(7) keV
| 147(5) ms
|
|
| 9/2−#
|
|-
| rowspan=2|196At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 111
| rowspan=2|195.99579(6)
| rowspan=2|253(9) ms
| (96%)
| 192Bi
| rowspan=2|3+#
| rowspan=2|
|-
| (4.0%)
| 196Po
|-
| style="text-indent:1em" | 196m1At
| colspan="3" style="text-indent:2em" | −30(80) keV
| 20# ms
|
|
| 10−#
|
|-
| style="text-indent:1em" | 196m2At
| colspan="3" style="text-indent:2em" | 157.9(1) keV
| 11 µs
|
|
| 5+#
|
|-
| rowspan=2|197At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 112
| rowspan=2|196.99319(5)
| rowspan=2|0.390(16) s
| (96%)
| 193Bi
| rowspan=2|(9/2−)
| rowspan=2|
|-
| (4.0%)
| 197Po
|-
| style="text-indent:1em" | 197mAt
| colspan="3" style="text-indent:2em" | 52(10) keV
| 2.0(2) s
|
|
| (1/2+)
|
|-
| rowspan=2|198At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 113
| rowspan=2|197.99284(5)
| rowspan=2|4.2(3) s
| (94%)
| 194Bi
| rowspan=2|(3+)
| rowspan=2|
|-
| (6%)
| 198Po
|-
| style="text-indent:1em" | 198mAt
| colspan="3" style="text-indent:2em" | 330(90)# keV
| 1.0(2) s
|
|
| (10−)
|
|-
| rowspan=2|199At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 114
| rowspan=2|198.99053(5)
| rowspan=2|6.92(13) s
| (89%)
| 195Bi
| rowspan=2|(9/2−)
| rowspan=2|
|-
| (11%)
| 199Po
|-
| rowspan=2|200At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 115
| rowspan=2|199.990351(26)
| rowspan=2|43.2(9) s
| (57%)
| 196Bi
| rowspan=2|(3+)
| rowspan=2|
|-
| (43%)
| 200Po
|-
| rowspan=3 style="text-indent:1em" | 200m1At
| rowspan=3 colspan="3" style="text-indent:2em" | 112.7(30) keV
| rowspan=3|47(1) s
| (43%)
| 196Bi
| rowspan=3|(7+)
| rowspan=3|
|-
| IT
| 200At
|-
|
| 200Po
|-
| style="text-indent:1em" | 200m2At
| colspan="3" style="text-indent:2em" | 344(3) keV
| 3.5(2) s
|
|
| (10−)
|
|-
| rowspan=2|201At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 116
| rowspan=2|200.988417(9)
| rowspan=2|85(3) s
| (71%)
| 197Bi
| rowspan=2|(9/2−)
| rowspan=2|
|-
| (29%)
| 201Po
|-
| rowspan=2|202At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 117
| rowspan=2|201.98863(3)
| rowspan=2|184(1) s
| (88%)
| 202Po
| rowspan=2|(2,3)+
| rowspan=2|
|-
| (12%)
| 198Bi
|-
| style="text-indent:1em" | 202m1At
| colspan="3" style="text-indent:2em" | 190(40) keV
| 182(2) s
|
|
| (7+)
|
|-
| style="text-indent:1em" | 202m2At
| colspan="3" style="text-indent:2em" | 580(40) keV
| 460(50) ms
|
|
| (10−)
|
|-
| rowspan=2|203At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 118
| rowspan=2|202.986942(13)
| rowspan=2|7.37(13) min
| (69%)
| 203Po
| rowspan=2|9/2−
| rowspan=2|
|-
| (31%)
| 199Bi
|-
| rowspan=2|204At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 119
| rowspan=2|203.987251(26)
| rowspan=2|9.2(2) min
| (96%)
| 204Po
| rowspan=2|7+
| rowspan=2|
|-
| (3.8%)
| 200Bi
|-
| style="text-indent:1em" | 204mAt
| colspan="3" style="text-indent:2em" | 587.30(20) keV
| 108(10) ms
| IT
| 204At
| (10−)
|
|-
| rowspan=2|205At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 120
| rowspan=2|204.986074(16)
| rowspan=2|26.2(5) min
| (90%)
| 205Po
| rowspan=2|9/2−
| rowspan=2|
|-
| (10%)
| 201Bi
|-
| style="text-indent:1em" | 205mAt
| colspan="3" style="text-indent:2em" | 2339.65(23) keV
| 7.76(14) µs
|
|
| 29/2+
|
|-
| rowspan=2|206At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 121
| rowspan=2|205.986667(22)
| rowspan=2|30.6(13) min
| (99.11%)
| 206Po
| rowspan=2|(5)+
| rowspan=2|
|-
| (0.9%)
| 202Bi
|-
| style="text-indent:1em" | 206mAt
| colspan="3" style="text-indent:2em" | 807(3) keV
| 410(80) ns
|
|
| (10)−
|
|-
| rowspan=2|207At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 122
| rowspan=2|206.985784(23)
| rowspan=2|1.80(4) h
| (91%)
| 207Po
| rowspan=2|9/2−
| rowspan=2|
|-
| (8.6%)
| 203Bi
|-
| rowspan=2|208At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 123
| rowspan=2|207.986590(28)
| rowspan=2|1.63(3) h
| (99.5%)
| 208Po
| rowspan=2|6+
| rowspan=2|
|-
| (0.55%)
| 204Bi
|-
| rowspan=2|209At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 124
| rowspan=2|208.986173(8)
| rowspan=2|5.41(5) h
| (96%)
| 209Po
| rowspan=2|9/2−
| rowspan=2|
|-
| (4.0%)
| 205Bi
|-
| rowspan=2|210At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 125
| rowspan=2|209.987148(8)
| rowspan=2|8.1(4) h
| (99.8%)
| 210Po
| rowspan=2|(5)+
| rowspan=2|
|-
| (0.18%)
| 206Bi
|-
| style="text-indent:1em" | 210m1At
| colspan="3" style="text-indent:2em" | 2549.6(2) keV
| 482(6) µs
|
|
| (15)−
|
|-
| style="text-indent:1em" | 210m2At
| colspan="3" style="text-indent:2em" | 4027.7(2) keV
| 5.66(7) µs
|
|
| (19)+
|
|-
| rowspan=2|211At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 126
| rowspan=2|210.9874963(30)
| rowspan=2|7.214(7) h
| (58.2%)
| 211Po
| rowspan=2|9/2−
| rowspan=2|
|-
| (42%)
| 207Bi
|-
| rowspan=3|212At
| rowspan=3 style="text-align:right" | 85
| rowspan=3 style="text-align:right" | 127
| rowspan=3|211.990745(8)
| rowspan=3|0.314(2) s
| (99.95%)
| 208Bi
| rowspan=3|(1−)
| rowspan=3|
|-
| (0.05%)
| 212Po
|-
| (2×10−6%)
| 212Rn
|-
| rowspan=2 style="text-indent:1em" | 212m1At
| rowspan=2 colspan="3" style="text-indent:2em" | 223(7) keV
| rowspan=2|0.119(3) s
| (99%)
| 208Bi
| rowspan=2|(9−)
| rowspan=2|
|-
| IT (1%)
| 212At
|-
| style="text-indent:1em" | 212m2At
| colspan="3" style="text-indent:2em" | 4771.6(11) keV
| 152(5) µs
|
|
| (25−)
|
|-
| 213At
| style="text-align:right" | 85
| style="text-align:right" | 128
| 212.992937(5)
| 125(6) ns
|
| 209Bi
| 9/2−
|
|-
| 214At
| style="text-align:right" | 85
| style="text-align:right" | 129
| 213.996372(5)
| 558(10) ns
|
| 210Bi
| 1−
|
|-
| style="text-indent:1em" | 214m1At
| colspan="3" style="text-indent:2em" | 59(9) keV
| 265(30) ns
|
|
|
|
|-
| style="text-indent:1em" | 214m2At
| colspan="3" style="text-indent:2em" | 231(6) keV
| 760(15) ns
|
|
| 9−
|
|-
| 215At
| style="text-align:right" | 85
| style="text-align:right" | 130
| 214.998653(7)
| 0.10(2) ms
|
| 211Bi
| 9/2−
| 痕量
|-
| rowspan=3|216At
| rowspan=3 style="text-align:right" | 85
| rowspan=3 style="text-align:right" | 131
| rowspan=3|216.002423(4)
| rowspan=3|0.30(3) ms
| (99.99%)
| 212Bi
| rowspan=3|1−
| rowspan=3|
|-
| (.006%)
| 216Rn
|-
| (3×10−7%)
| 216Po
|-
| style="text-indent:1em" | 216mAt
| colspan="3" style="text-indent:2em" | 413(5) keV
| 100# µs
|
|
| (9−)
|
|-
| rowspan=2|217At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 132
| rowspan=2|217.004719(5)
| rowspan=2|32.3(4) ms
| (99.98%)
| 213Bi
| rowspan=2|9/2−
| rowspan=2|痕量
|-
| (.012%)
| 217Rn
|-
| rowspan=2|218At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 133
| rowspan=2|218.008694(12)
| rowspan=2|1.27(6) s
| (99.9%)
| 214Bi
| rowspan=2|1−#
| rowspan=2|痕量
|-
| (0.10%)
| 218Rn
|-
| rowspan=2|219At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 134
| rowspan=2|219.011162(4)
| rowspan=2|56(3) s
| (97%)
| 215Bi
| rowspan=2|(9/2−)
| rowspan=2|痕量
|-
| (3.0%)
| 219Rn
|-
| rowspan=2|220At
| rowspan=2 style="text-align:right" | 85
| rowspan=2 style="text-align:right" | 135
| rowspan=2|220.01541(6)
| rowspan=2|3.71(4) min
| (92%)
| 220Rn
| rowspan=2|3(−#)
| rowspan=2|
|-
| (8.0%)
| 216Bi
|-
| 221At
| style="text-align:right" | 85
| style="text-align:right" | 136
| 221.01805(21)#
| 2.3(2) min
|
| 221Rn
| 3/2−#
|
|-
| 222At
| style="text-align:right" | 85
| style="text-align:right" | 137
| 222.02233(32)#
| 54(10) s
|
| 222Rn
|
|
|-
| 223At
| style="text-align:right" | 85
| style="text-align:right" | 138
| 223.02519(43)#
| 50(7) s
|
|
| 3/2−#
|
|}
備註：畫上#號的數據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數據不確定性。
註釋
参考文獻
- Isotope masses from [https://web.archive.org/web/20080923134436/http://www.nndc.bnl.gov/amdc/index.html Ame2003 Atomic Mass Evaluation] by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
** Audi, Bersillon, Blachot, Wapstra. [http://amdc.in2p3.fr/web/nubase_en.html The Nubase2003 evaluation of nuclear and decay properties] , Nuc. Phys. A 729, pp. 3-128 (2003).
** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the [http://www.nndc.bnl.gov/nudat2/ NuDat 2.1 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.
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