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。
一覧

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
191At851061.7(+11-5) ms(1/2+)
191mAt2.1(+4-3) ms(7/2-)
192At85107192.00314(28)11.5(0.6) ms3+#
192mAt330(90)# keV88(6) ms(9-,10-)
193At85108192.99984(6)28(+5-4) ms(1/2+)
193m1At50 keV21(5) ms(7/2-)
193m2At39 keV27(+4-5) ms(13/2+)
194At85109193.99873(20)~40 ms3+#
194mAt480(190) keV~250 ms10-#
195At85110194.996268(10)328(20) ms(1/2+)
195mAt34(7) keV147(5) ms9/2-#
196At85111195.99579(6)253(9) ms3+#
196m1At-30(80) keV20# ms10-#
196m2At157.9(1) keV11 μs5+#
197At85112196.99319(5)0.390(16) s(9/2-)
197mAt52(10) keV2.0(2) s(1/2+)
198At85113197.99284(5)4.2(3) s(3+)
198mAt330(90)# keV1.0(2) s(10-)
199At85114198.99053(5)6.92(13) s(9/2-)
200At85115199.990351(26)43.2(9) s(3+)
200m1At112.7(30) keV47(1) s(7+)
200m2At344(3) keV3.5(2) s(10-)
201At85116200.988417(9)85(3) s(9/2-)
202At85117201.98863(3)184(1) s(2,3)+
202m1At190(40) keV182(2) s(7+)
202m2At580(40) keV460(50) ms(10-)
203At85118202.986942(13)7.37(13) min9/2-
204At85119203.987251(26)9.2(2) min7+
204mAt587.30(20) keV108(10) ms(10-)
205At85120204.986074(16)26.2(5) min9/2-
205mAt2339.65(23) keV7.76(14) μs29/2+
206At85121205.986667(22)30.6(13) min(5)+
206mAt807(3) keV410(80) ns(10)-
207At85122206.985784(23)1.80(4) h9/2-
208At85123207.986590(28)1.63(3) h6+
209At85124208.986173(8)5.41(5) h9/2-
210At85125209.987148(8)8.1(4) h(5)+
210m1At2549.6(2) keV482(6) μs(15)-
210m2At4027.7(2) keV5.66(7) μs(19)+
211At85126210.9874963(30)7.214(7) h9/2-
212At85127211.990745(8)0.314(2) s(1-)
212m1At223(7) keV0.119(3) s(9-)
212m2At4771.6(11) keV152(5) μs(25-)
213At85128212.992937(5)125(6) ns9/2-
214At85129213.996372(5)558(10) ns1-
214m1At59(9) keV265(30) ns
214m2At231(6) keV760(15) ns9-
215At85130214.998653(7)0.10(2) ms9/2-
216At85131216.002423(4)0.30(3) ms1-
216mAt413(5) keV100# μs(9-)
217At85132217.004719(5)32.3(4) ms9/2-
218At85133218.008694(12)1.5(3) s1-#
219At85134219.011162(4)56(3) s5/2-#
220At85135220.01541(6)3.71(4) min3(-#)
221At85136221.01805(21)#2.3(2) min3/2-#
222At85137222.02233(32)#54(10) s
223At85138223.02519(43)#50(7) s3/2-#

参考文献

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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表

話

編

歴
 同位体
1H 2He

安定
1億年?
1万年?
10年?
100日?
1日?
1分?
1分未満
魔法数

3Li4Be 5B6C7N8O9F10Ne