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砈的同位素

主要的砈同位素
同位素 衰變
丰度 半衰期 (t1/2) 方式 能量
MeV
產物
209At 人造 5.42 小時 β+ 1.460 209Po
α 5.758 205Bi
210At 人造 8.1 小時 β+ 2.959 210Po
α 5.632 206Bi
211At 人造 7.214 小時 ε 0.785 211Po
α 5.983 207Bi
219At 痕量 56  α 6.324 215Bi
β 1.567 219Rn
←Po84 Rn86

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

[编辑]
符號 Z N 同位素質量(u
[n 1][n 2]
半衰期
[n 1][n 2]
衰變
方式
[1]
衰變
產物

[n 3]
原子核
自旋[n 1]
相對豐度
莫耳分率)
激發能量[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+ (不常見) 194Po
194mAt 480(190) keV ~250 ms α 190Bi 10−#
IT (不常見) 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−#

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。


同位素列表
釙的同位素 砈的同位素 氡的同位素

註釋

[编辑]
  1. ^ 1.0 1.1 1.2 1.3 畫上#號的數據代表沒有經過實驗的証明,僅為理論推測。
  2. ^ 2.0 2.1 2.2 用括號括起來的數據代表不確定性。
  3. ^ 半衰期超过5亿年的衰变产物以粗斜体表示。
  4. ^ 4.0 4.1 235U衰变产物
  5. ^ 237Np衰变产物
  6. ^ 238U衰变产物

参考文獻

[编辑]
  1. ^ Universal Nuclide Chart需要免费注册. nucleonica. [2015-10-16]. (原始内容存档于2017-02-19). 
  2. ^ Cubiss, J. G.; Andreyev, A. N.; Barzakh, A. E.; Andel, B.; Antalic, S.; Cocolios, T. E.; Goodacre, T. Day; Fedorov, D. V.; Fedosseev, V. N.; Ferrer, R.; Fink, D. A.; Gaffney, L. P.; Ghys, L.; Huyse, M.; Kalaninová, Z.; Köster, U.; Marsh, B. A.; Molkanov, P. L.; Rossel, R. E.; Rothe, S.; Seliverstov, M. D.; Sels, S.; Sjödin, A. M.; Stryjczyk, M.; L.Truesdale, V.; Van Beveren, C.; Van Duppen, P.; Wilson, G. L. Fine structure in the α decay of At218. Physical Review C (American Physical Society (APS)). 2019-06-14, 99 (6). ISSN 2469-9985. doi:10.1103/physrevc.99.064317. 
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砈的同位素
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