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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。
符号 | Z | N | 同位素质量(u) [n 1][n 2] |
半衰期 [n 1][n 2] |
衰变 方式[1] |
衰变 产物 [n 3] |
原子核 自旋[n 1] |
相对丰度 (莫耳分率) |
---|---|---|---|---|---|---|---|---|
激发能量[n 1][n 2] | ||||||||
191At | 85 | 106 | 1.7(+11−5) ms | (1/2+) | ||||
191mAt | 2.1(+4−3) ms | (7/2−) | ||||||
193At | 85 | 108 | 192.99984(6) | 28(+5−4) ms | α | 189Bi | (1/2+) | |
193m1At | 50 keV | 21(5) ms | (7/2−) | |||||
193m2At | 39 keV | 27(+4−5) ms | (13/2+) | |||||
194At | 85 | 109 | 193.99873(20) | ~40 ms | α | 190Bi | 3+# | |
β+ (不常见) | 194Po | |||||||
194mAt | 480(190) keV | ~250 ms | α | 190Bi | 10−# | |||
IT (不常见) | 194At | |||||||
195At | 85 | 110 | 194.996268(10) | 328(20) ms | α (75%) | 191Bi | (1/2+) | |
β+ (25%) | 195Po | |||||||
195mAt | 34(7) keV | 147(5) ms | 9/2−# | |||||
196At | 85 | 111 | 195.99579(6) | 253(9) ms | α (96%) | 192Bi | 3+# | |
β+ (4.0%) | 196Po | |||||||
196m1At | −30(80) keV | 20# ms | 10−# | |||||
196m2At | 157.9(1) keV | 11 µs | 5+# | |||||
197At | 85 | 112 | 196.99319(5) | 0.390(16) s | α (96%) | 193Bi | (9/2−) | |
β+ (4.0%) | 197Po | |||||||
197mAt | 52(10) keV | 2.0(2) s | (1/2+) | |||||
198At | 85 | 113 | 197.99284(5) | 4.2(3) s | α (94%) | 194Bi | (3+) | |
β+ (6%) | 198Po | |||||||
198mAt | 330(90)# keV | 1.0(2) s | (10−) | |||||
199At | 85 | 114 | 198.99053(5) | 6.92(13) s | α (89%) | 195Bi | (9/2−) | |
β+ (11%) | 199Po | |||||||
200At | 85 | 115 | 199.990351(26) | 43.2(9) s | α (57%) | 196Bi | (3+) | |
β+ (43%) | 200Po | |||||||
200m1At | 112.7(30) keV | 47(1) s | α (43%) | 196Bi | (7+) | |||
IT | 200At | |||||||
β+ | 200Po | |||||||
200m2At | 344(3) keV | 3.5(2) s | (10−) | |||||
201At | 85 | 116 | 200.988417(9) | 85(3) s | α (71%) | 197Bi | (9/2−) | |
β+ (29%) | 201Po | |||||||
202At | 85 | 117 | 201.98863(3) | 184(1) s | β+ (88%) | 202Po | (2,3)+ | |
α (12%) | 198Bi | |||||||
202m1At | 190(40) keV | 182(2) s | (7+) | |||||
202m2At | 580(40) keV | 460(50) ms | (10−) | |||||
203At | 85 | 118 | 202.986942(13) | 7.37(13) min | β+ (69%) | 203Po | 9/2− | |
α (31%) | 199Bi | |||||||
204At | 85 | 119 | 203.987251(26) | 9.2(2) min | β+ (96%) | 204Po | 7+ | |
α (3.8%) | 200Bi | |||||||
204mAt | 587.30(20) keV | 108(10) ms | IT | 204At | (10−) | |||
205At | 85 | 120 | 204.986074(16) | 26.2(5) min | β+ (90%) | 205Po | 9/2− | |
α (10%) | 201Bi | |||||||
205mAt | 2339.65(23) keV | 7.76(14) µs | 29/2+ | |||||
206At | 85 | 121 | 205.986667(22) | 30.6(13) min | β+ (99.11%) | 206Po | (5)+ | |
α (0.9%) | 202Bi | |||||||
206mAt | 807(3) keV | 410(80) ns | (10)− | |||||
207At | 85 | 122 | 206.985784(23) | 1.80(4) h | β+ (91%) | 207Po | 9/2− | |
α (8.6%) | 203Bi | |||||||
208At | 85 | 123 | 207.986590(28) | 1.63(3) h | β+ (99.5%) | 208Po | 6+ | |
α (0.55%) | 204Bi | |||||||
209At | 85 | 124 | 208.986173(8) | 5.41(5) h | β+ (96%) | 209Po | 9/2− | |
α (4.0%) | 205Bi | |||||||
210At | 85 | 125 | 209.987148(8) | 8.1(4) h | β+ (99.8%) | 210Po | (5)+ | |
α (0.18%) | 206Bi | |||||||
210m1At | 2549.6(2) keV | 482(6) µs | (15)− | |||||
210m2At | 4027.7(2) keV | 5.66(7) µs | (19)+ | |||||
211At | 85 | 126 | 210.9874963(30) | 7.214(7) h | ε (58.2%) | 211Po | 9/2− | |
α (42%) | 207Bi | |||||||
212At | 85 | 127 | 211.990745(8) | 0.314(2) s | α (99.95%) | 208Bi | (1−) | |
β+ (0.05%) | 212Po | |||||||
β− (2×10−6%) | 212Rn | |||||||
212m1At | 223(7) keV | 0.119(3) s | α (99%) | 208Bi | (9−) | |||
IT (1%) | 212At | |||||||
212m2At | 4771.6(11) keV | 152(5) µs | (25−) | |||||
213At | 85 | 128 | 212.992937(5) | 125(6) ns | α | 209Bi | 9/2− | |
214At | 85 | 129 | 213.996372(5) | 558(10) ns | α | 210Bi | 1− | |
214m1At | 59(9) keV | 265(30) ns | ||||||
214m2At | 231(6) keV | 760(15) ns | 9− | |||||
215At | 85 | 130 | 214.998653(7) | 0.10(2) ms | α | 211Bi | 9/2− | 痕量[n 4] |
216At | 85 | 131 | 216.002423(4) | 0.30(3) ms | α (99.99%) | 212Bi | 1− | |
β− (.006%) | 216Rn | |||||||
ε (3×10−7%) | 216Po | |||||||
216mAt | 413(5) keV | 100# µs | (9−) | |||||
217At | 85 | 132 | 217.004719(5) | 32.3(4) ms | α (99.98%) | 213Bi | 9/2− | 痕量[n 5] |
β− (.012%) | 217Rn | |||||||
218At | 85 | 133 | 218.008694(12) | 1.27(6) s[2] | α (99.9%) | 214Bi | 1−# | 痕量[n 6] |
β− (0.10%) | 218Rn | |||||||
219At | 85 | 134 | 219.011162(4) | 56(3) s | α (97%) | 215Bi | (9/2−) | 痕量[n 4] |
β− (3.0%) | 219Rn | |||||||
220At | 85 | 135 | 220.01541(6) | 3.71(4) min | β− (92%) | 220Rn | 3(−#) | |
α (8.0%) | 216Bi | |||||||
221At | 85 | 136 | 221.01805(21)# | 2.3(2) min | β− | 221Rn | 3/2−# | |
222At | 85 | 137 | 222.02233(32)# | 54(10) s | β− | 222Rn | ||
223At | 85 | 138 | 223.02519(43)# | 50(7) s | 3/2−# |
备注:画上#号的数据代表没有经过实验的证明,只是理论推测而已,而用括号括起来的代表数据不确定性。
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