出典: フリー百科事典『ウィキペディア（Wikipedia）』
アスタチン(At)には、33種類の同位体が知られている。全て放射性同位体で、原子量は191から223の間である。23種類の準安定励起状態も存在する。最も寿命の長い同位体は210Atで、半減期は8.3時間である。最も寿命の短い同位体は213Atで、半減期は125ナノ秒である。
| 同位体核種
|
Z(p)
|
N(n)
|
同位体質量 (u)
|
半減期
|
核スピン数
|
天然存在比
|
天然存在比
(範囲)
|
| 励起エネルギー
|
| 191At
|
85
|
106
|
|
1.7(+11-5) ms
|
(1/2+)
|
|
|
| 191mAt
|
|
2.1(+4-3) ms
|
(7/2-)
|
|
|
| 192At
|
85
|
107
|
192.00314(28)
|
11.5(0.6) ms
|
3+#
|
|
|
| 192mAt
|
330(90)# keV
|
88(6) ms
|
(9-,10-)
|
|
|
| 193At
|
85
|
108
|
192.99984(6)
|
28(+5-4) ms
|
(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
|
3+#
|
|
|
| 194mAt
|
480(190) keV
|
~250 ms
|
10-#
|
|
|
| 195At
|
85
|
110
|
194.996268(10)
|
328(20) ms
|
(1/2+)
|
|
|
| 195mAt
|
34(7) keV
|
147(5) ms
|
9/2-#
|
|
|
| 196At
|
85
|
111
|
195.99579(6)
|
253(9) ms
|
3+#
|
|
|
| 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
|
(9/2-)
|
|
|
| 197mAt
|
52(10) keV
|
2.0(2) s
|
(1/2+)
|
|
|
| 198At
|
85
|
113
|
197.99284(5)
|
4.2(3) s
|
(3+)
|
|
|
| 198mAt
|
330(90)# keV
|
1.0(2) s
|
(10-)
|
|
|
| 199At
|
85
|
114
|
198.99053(5)
|
6.92(13) s
|
(9/2-)
|
|
|
| 200At
|
85
|
115
|
199.990351(26)
|
43.2(9) s
|
(3+)
|
|
|
| 200m1At
|
112.7(30) keV
|
47(1) s
|
(7+)
|
|
|
| 200m2At
|
344(3) keV
|
3.5(2) s
|
(10-)
|
|
|
| 201At
|
85
|
116
|
200.988417(9)
|
85(3) s
|
(9/2-)
|
|
|
| 202At
|
85
|
117
|
201.98863(3)
|
184(1) s
|
(2,3)+
|
|
|
| 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
|
9/2-
|
|
|
| 204At
|
85
|
119
|
203.987251(26)
|
9.2(2) min
|
7+
|
|
|
| 204mAt
|
587.30(20) keV
|
108(10) ms
|
(10-)
|
|
|
| 205At
|
85
|
120
|
204.986074(16)
|
26.2(5) min
|
9/2-
|
|
|
| 205mAt
|
2339.65(23) keV
|
7.76(14) µs
|
29/2+
|
|
|
| 206At
|
85
|
121
|
205.986667(22)
|
30.6(13) min
|
(5)+
|
|
|
| 206mAt
|
807(3) keV
|
410(80) ns
|
(10)-
|
|
|
| 207At
|
85
|
122
|
206.985784(23)
|
1.80(4) h
|
9/2-
|
|
|
| 208At
|
85
|
123
|
207.986590(28)
|
1.63(3) h
|
6+
|
|
|
| 209At
|
85
|
124
|
208.986173(8)
|
5.41(5) h
|
9/2-
|
|
|
| 210At
|
85
|
125
|
209.987148(8)
|
8.1(4) h
|
(5)+
|
|
|
| 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
|
9/2-
|
|
|
| 212At
|
85
|
127
|
211.990745(8)
|
0.314(2) s
|
(1-)
|
|
|
| 212m1At
|
223(7) keV
|
0.119(3) s
|
(9-)
|
|
|
| 212m2At
|
4771.6(11) keV
|
152(5) µs
|
(25-)
|
|
|
| 213At
|
85
|
128
|
212.992937(5)
|
125(6) ns
|
9/2-
|
|
|
| 214At
|
85
|
129
|
213.996372(5)
|
558(10) ns
|
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
|
9/2-
|
|
|
| 216At
|
85
|
131
|
216.002423(4)
|
0.30(3) ms
|
1-
|
|
|
| 216mAt
|
413(5) keV
|
100# µs
|
(9-)
|
|
|
| 217At
|
85
|
132
|
217.004719(5)
|
32.3(4) ms
|
9/2-
|
|
|
| 218At
|
85
|
133
|
218.008694(12)
|
1.5(3) s
|
1-#
|
|
|
| 219At
|
85
|
134
|
219.011162(4)
|
56(3) s
|
5/2-#
|
|
|
| 220At
|
85
|
135
|
220.01541(6)
|
3.71(4) min
|
3(-#)
|
|
|
| 221At
|
85
|
136
|
221.01805(21)#
|
2.3(2) min
|
3/2-#
|
|
|
| 222At
|
85
|
137
|
222.02233(32)#
|
54(10) s
|
|
|
|
| 223At
|
85
|
138
|
223.02519(43)#
|
50(7) s
|
3/2-#
|
|
|
- Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. 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 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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