{{위키데이터 속성 추적}}
'''[[악티늄]]'''은 [[안정 동위 원소]]가 존재하지 않고 오직 [[방사성 동위 원소]]로만 구성되어 있다. 따라서 악티늄의 표준 원자량은 정해져 있지 않다. 악티늄은 원자량 206에서 236 사이에 총 31개의 [[동위 원소]]와 2개의 [[이성질핵]]이 알려져 있다. 이들 중 <sup>227</sup>Ac와 <sup>228</sup>Ac는 자연에서 미량 발견되며, 각각 [[우라늄-235|<sup>235</sup>U]]와 [[토륨-232|<sup>232</sup>Th]]의 중간 [[붕괴 생성물]]이다. <sup>228</sup>Ac은 자연에서 극히 드물기 때문에 자연에 존재하는 악티늄은 주로 <sup>227</sup>Ac이며, 반감기도 21.772년으로 제일 길다. 그 다음으로는 <sup>225</sup>Ac(반감기 10.0일)와 <sup>226</sup>Ac(반감기 29.37시간)이 비교적 안정하며, 이밖의 방사성 동위 원소들은 모두 반감기가 10시간 미만이고 대부분은 1분 미만이다.

== 표 ==
{| class="wikitable" style="font-size:95%; white-space:nowrap"
! rowspan="2" | 핵종<br />기호
! rowspan="2" | 역사적 이름
! Z([[양성자|p]])
! N([[중성자|n]])
! &nbsp;<br />동위 원소 질량 (u)<br />&nbsp;
! rowspan="2" | 반감기
! rowspan="2" | 붕괴<br />방식<ref>http://www.nucleonica.net/unc.aspx</ref><ref group="n">약자:<br />CD: [[뭉치 붕괴]]<br />ε: [[전자 포획]]<br />IT: [[이성질핵 전이]]</ref>
! rowspan="2" | 붕괴<br />생성물<ref group="n">굵은 기울임꼴은 반감기가 우주의 나이보다 긴 동위 원소(거의 안정적)</ref>
! rowspan="2" | 핵<br />스핀
! rowspan="2" | 전형적<br />동위 원소<br />구성비<br />(몰 분율)
! rowspan="2" | 자연적<br />구성비<br />변동 범위<br />(몰 분율)
|-
! colspan="3" | 들뜬 에너지
|-
|<sup>205</sup>Ac<ref name="ZhangEtAl2014">{{인용| last = Zhang | first = Z. Y.| last2 = Gan | first2 = Z. G.| last3=Ma|first3=L.|last4=Yang|first4=H. B.|last5=Huang|first5=T.H.|last6=Li|first6=G.S.|last7=Tian|first7=Y.L|last8=Wang|first8=Y.S.|last9=Xu|first9=X.X.|last10=Huang|first10=M.H.|last11=Luo|first11=C.|last12=Ren|first12=Z.Z.|last13=Zhou|first13=S.G|last14=Zhou|first14=X. H.|last16=Xu|first16=H. S.|last17=Xiao|first17=G.Q.| title =α decay of the new neutron-deficient isotope <sup>205</sup>Ac| journal = Phys. Rev. Lett.| volume = 89| issue = 1| pages = 014308|date=Jan 2014 | url = http://journals.aps.org/prc/abstract/10.1103/PhysRevC.89.014308| doi =10.1103/PhysRevC.89.014308  }}</ref>
|
| style="text-align:right" | 89
| style="text-align:right" | 116
|
| 20(+97-9) ms
| [[알파 붕괴|α]]
| <sup>201</sup>Fr
|
|
|
|-
| <sup>206</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 117
| 206.01450(8)
| 25(7) ms
|
|
| (3+)
|
|
|-
| style="text-indent:1em" | <sup>206m1</sup>Ac
|
| colspan="3" style="text-indent:2em" | 80(50) keV
| 15(6) ms
|
|
|
|
|
|-
| style="text-indent:1em" | <sup>206m2</sup>Ac
|
| colspan="3" style="text-indent:2em" | 290(110)# keV
| 41(16) ms
|
|
| (10-)
|
|
|-
| <sup>207</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 118
| 207.01195(6)
| 31(8) ms<br />[27(+11-6) ms]
| α
| <sup>203</sup>Fr
| 9/2-#
|
|
|-
| rowspan=2|<sup>208</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 119
| rowspan=2|208.01155(6)
| rowspan=2|97(16) ms<br />[95(+24-16) ms]
| α (99%)
| <sup>204</sup>Fr
| rowspan=2|(3+)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (1%)
| <sup>208</sup>Ra
|-
| rowspan=3 style="text-indent:1em" | <sup>208m</sup>Ac
| rowspan=3|
| rowspan=3 colspan="3" style="text-indent:2em" | 506(26) keV
| rowspan=3|28(7) ms<br />[25(+9-5) ms]
| α (89%)
| <sup>204</sup>Fr
| rowspan=3|(10-)
| rowspan=3|
| rowspan=3|
|-
| [[이성질핵 전이|IT]] (10%)
| <sup>208</sup>Ac
|-
| β<sup>+</sup> (1%)
| <sup>208</sup>Ra
|-
| rowspan=2|<sup>209</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 120
| rowspan=2|209.00949(5)
| rowspan=2|92(11) ms
| α (99%)
| <sup>205</sup>Fr
| rowspan=2|(9/2-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (1%)
| <sup>209</sup>Ra
|-
| rowspan=2|<sup>210</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 121
| rowspan=2|210.00944(6)
| rowspan=2|350(40) ms
| α (96%)
| <sup>206</sup>Fr
| rowspan=2|7+#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (4%)
| <sup>210</sup>Ra
|-
| rowspan=2|<sup>211</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 122
| rowspan=2|211.00773(8)
| rowspan=2|213(25) ms
| α (99.8%)
| <sup>207</sup>Fr
| rowspan=2|9/2-#
| rowspan=2| 
| rowspan=2|
|-
| β<sup>+</sup> (0.2%)
| <sup>211</sup>Ra
|-
| rowspan=2|<sup>212</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 123
| rowspan=2|212.00781(7)
| rowspan=2|920(50) ms
| α (97%)
| <sup>208</sup>Fr
| rowspan=2|6+#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (3%)
| <sup>212</sup>Ra
|-
| rowspan=2|<sup>213</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 124
| rowspan=2|213.00661(6)
| rowspan=2|731(17) ms
| α
| <sup>209</sup>Fr
| rowspan=2|(9/2-)#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (드묾)
| <sup>213</sup>Ra
|-
| rowspan=2|<sup>214</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 125
| rowspan=2|214.006902(24)
| rowspan=2|8.2(2) s
| α (89%)
| <sup>210</sup>Fr
| rowspan=2|(5+)#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (11%)
| <sup>214</sup>Ra
|-
| rowspan=2|<sup>215</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 126
| rowspan=2|215.006454(23)
| rowspan=2|0.17(1) s
| α (99.91%)
| <sup>211</sup>Fr
| rowspan=2|9/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (0.09%)
| <sup>215</sup>Ra
|-
| rowspan=2|<sup>216</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 127
| rowspan=2|216.008720(29)
| rowspan=2|0.440(16) ms
| α
| <sup>212</sup>Fr
| rowspan=2|(1-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (7&times;10<sup>−5</sup>%)
| <sup>216</sup>Ra
|-
| style="text-indent:1em" | <sup>216m</sup>Ac
|
| colspan="3" style="text-indent:2em" | 44(7) keV
| 443(7) µs
|
|
| (9-)
|
|
|-
| rowspan=2|<sup>217</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 128
| rowspan=2|217.009347(14)
| rowspan=2|69(4) ns
| α (98%)
| <sup>213</sup>Fr
| rowspan=2|9/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (2%)
| <sup>217</sup>Ra
|-
| style="text-indent:1em" | <sup>217m</sup>Ac
|
| colspan="3" style="text-indent:2em" | 2012(20) keV
| 740(40) ns
|
|
| (29/2)+
|
|
|-
| <sup>218</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 129
| 218.01164(5)
| 1.08(9) µs
| α
| <sup>214</sup>Fr
| (1-)#
|
|
|-
| style="text-indent:1em" | <sup>218m</sup>Ac
|
| colspan="3" style="text-indent:2em" | 584(50)# keV
| 103(11) ns
|
|
| (11+)
|
|
|-
| rowspan=2|<sup>219</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 130
| rowspan=2|219.01242(5)
| rowspan=2|11.8(15) µs
| α
| <sup>215</sup>Fr
| rowspan=2|9/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (10<sup>−6</sup>%)
| <sup>219</sup>Ra
|-
| rowspan=2|<sup>220</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 131
| rowspan=2|220.014763(16)
| rowspan=2|26.36(19) ms
| α
| <sup>216</sup>Fr
| rowspan=2|(3-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (5&times;10<sup>−4</sup>%)
| <sup>220</sup>Ra
|-
| <sup>221</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 132
| 221.01559(5)
| 52(2) ms
| α
| <sup>217</sup>Fr
| 9/2-#
|
|
|-
| rowspan=2|<sup>222</sup>Ac
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 133
| rowspan=2|222.017844(6)
| rowspan=2|5.0(5) s
| α (99%)
| <sup>218</sup>Fr
| rowspan=2|1-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (1%)
| <sup>222</sup>Ra
|-
| rowspan=3 style="text-indent:1em" | <sup>222m</sup>Ac
| rowspan=3|
| rowspan=3 colspan="3" style="text-indent:2em" | 200(150)# keV
| rowspan=3|1.05(7) min
| α (88.6%)
| <sup>218</sup>Fr
| rowspan=3|high
| rowspan=3|
| rowspan=3|
|-
| IT (10%)
| <sup>222</sup>Ac
|-
| β<sup>+</sup> (1.4%)
| <sup>222</sup>Ra
|-
| rowspan=3|<sup>223</sup>Ac
| rowspan=3|
| rowspan=3 style="text-align:right" | 89
| rowspan=3 style="text-align:right" | 134
| rowspan=3|223.019137(8)
| rowspan=3|2.10(5) min
| α (99%)
| <sup>219</sup>Fr
| rowspan=3|(5/2-)
| rowspan=3|
| rowspan=3|
|-
| [[전자 포획|ε]] (1%)
| <sup>223</sup>Ra
|-
| [[뭉치 붕괴|CD]] (3.2&times;10<sup>−9</sup>%)
| '''''<sup>209</sup>Bi'''''<br />[[탄소-14|<sup>14</sup>C]]
|-
| rowspan=3|<sup>224</sup>Ac
| rowspan=3|
| rowspan=3 style="text-align:right" | 89
| rowspan=3 style="text-align:right" | 135
| rowspan=3|224.021723(4)
| rowspan=3|2.78(17) h
| β<sup>+</sup> (90.9%)
| <sup>224</sup>Ra
| rowspan=3|0-
| rowspan=3|
| rowspan=3|
|-
| α (9.1%)
| <sup>220</sup>Fr
|-
| β<sup>-</sup> (1.6%)
| <sup>224</sup>Th
|-
| rowspan=2|<sup>225</sup>Ac<ref group="n">[[핵의학]]에 사용된다.</ref>
| rowspan=2|
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 136
| rowspan=2|225.023230(5)
| rowspan=2|10.0(1) d
| α
| <sup>221</sup>Fr
| rowspan=2|(3/2-)
| rowspan=2|
| rowspan=2|
|-
| CD (6&times;10<sup>−10</sup>%)
| <sup>211</sup>Bi<br /><sup>14</sup>C
|-
| rowspan=3|<sup>226</sup>Ac
| rowspan=3|
| rowspan=3 style="text-align:right" | 89
| rowspan=3 style="text-align:right" | 137
| rowspan=3|226.026098(4)
| rowspan=3|29.37(12) h
| β<sup>-</sup> (83%)
| <sup>226</sup>Th
| rowspan=3|(1)(-#)
| rowspan=3|
| rowspan=3|
|-
| ε (17%)
| <sup>226</sup>Ra
|-
| α (0.006%)
| <sup>222</sup>Fr
|-
| rowspan=2|<sup>227</sup>Ac
| rowspan=2|악티늄<ref group="n">여기서 원소 이름 '''악티늄'''을 따온 것이다.</ref>
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 138
| rowspan=2|227.0277521(26)
| rowspan=2|21.772(3) y
| β<sup>-</sup> (98.61%)
| <sup>227</sup>Th
| rowspan=2|3/2-
| rowspan=2|미량<ref group="n">[[우라늄-235|<sup>235</sup>U]]의 중간 [[붕괴 생성물]]</ref>
| rowspan=2|
|-
| α (1.38%)
| <sup>223</sup>Fr
|-
| rowspan=2|<sup>228</sup>Ac
| rowspan=2|메소토륨 2
| rowspan=2 style="text-align:right" | 89
| rowspan=2 style="text-align:right" | 139
| rowspan=2|228.0310211(27)
| rowspan=2|6.13(2) h
| β<sup>-</sup>
| <sup>228</sup>Th
| rowspan=2|3+
| rowspan=2|미량<ref group="n">[[토륨-232|<sup>232</sup>Th]]의 중간 [[붕괴 생성물]]</ref>
| rowspan=2|
|-
| α (5.5&times;10<sup>−6</sup>%)
| <sup>224</sup>Fr
|-
| <sup>229</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 140
| 229.03302(4)
| 62.7(5) min
| β<sup>-</sup>
| <sup>229</sup>Th
| (3/2+)
|
|
|-
| <sup>230</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 141
| 230.03629(32)
| 122(3) s
| β<sup>-</sup>
| <sup>230</sup>Th
| (1+)
|
|
|-
| <sup>231</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 142
| 231.03856(11)
| 7.5(1) min
| β<sup>-</sup>
| <sup>231</sup>Th
| (1/2+)
|
|
|-
| <sup>232</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 143
| 232.04203(11)
| 119(5) s
| β<sup>-</sup>
| '''''<sup>232</sup>Th'''''
| (1+)
|
|
|-
| <sup>233</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 144
| 233.04455(32)#
| 145(10) s
| β<sup>-</sup>
| <sup>233</sup>Th
| (1/2+)
|
|
|-
| <sup>234</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 145
| 234.04842(43)#
| 44(7) s
| β<sup>-</sup>
| <sup>234</sup>Th
|
|
|
|-
| <sup>235</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 146
| 235.05123(38)#
| 40# s
| β<sup>-</sup>
| <sup>235</sup>Th
| 1/2+#
|
|
|-
| <sup>236</sup>Ac
|
| style="text-align:right" | 89
| style="text-align:right" | 147
| 236.05530(54)#
| 2# min
| β<sup>-</sup>
| <sup>236</sup>Th
|
|
|
|}

== 같이 보기 ==
* [[붕괴 사슬]]
* [[악티늄족]]
== 각주 ==
<references/>
; 내용주
<references group="n" />

{{동위 원소 색인}}
{{전거 통제}}

[[분류:악티늄| 동위 원소]]
[[분류:악티늄 동위 원소]]
[[분류:원소별 동위 원소 목록]]