{{위키데이터 속성 추적}}
'''[[프로트악티늄]]'''은 [[안정 동위 원소]]가 존재하지 않으나, 세 가지 천연 동위 원소(<sup>231</sup>Pa, <sup>234</sup>Pa, <sup>234m</sup>Pa)가 존재하므로 표준 원자량을 구할 수 있다. 이 중 <sup>231</sup>Pa이 거의 전부를 차지한다. 총 29가지의 방사성 동위 원소와 3가지의 [[이성질핵]]이 발견되어 있으며, 그 중 가장 안정한 것은 32,760년의 반감기를 갖는 <sup>231</sup>Pa, 26.967일의 반감기를 갖는 <sup>233</sup>Pa, 17.4일의 반감기를 갖는 <sup>230</sup>Pa 순으로 안정하다. 이밖의 [[방사성 동위 원소]]들은 모두 1.6일보다 짧은 반감기를 가지고 있으며, 대부분은 1.8초 미만이다. 원자량 231 미만의 동위 원소들은 주로 [[알파 붕괴]]를 통해 [[악티늄 동위 원소]]로 붕괴하며, 그보다 원자량이 큰 동위 원소들은 [[베타 붕괴#음의 베타 붕괴 (β-)|β<sup>-</sup> 붕괴]]를 통해 주로 [[우라늄 동위 원소]]로 붕괴한다.

프로트악티늄의 표준 원자량은 231.03588(2) [[원자량 단위|u]]이다.
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== 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]]<br />SF: [[자발 핵분열]]</ref>
! rowspan="2" | 붕괴<br />생성물<ref group="n">굵은 글씨는 안정 동위 원소</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>212</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 121
| 212.02320(8)
| 8(5) ms<br />[5.1(+61-19) ms]
|
|
| 7+#
|
|
|-
| <sup>213</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 122
| 213.02111(8)
| 7(3) ms<br />[5.3(+40-16) ms]
| [[알파 붕괴|α]]
| <sup>209</sup>Ac
| 9/2-#
|
|
|-
| <sup>214</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 123
| 214.02092(8)
| 17(3) ms
| α
| <sup>210</sup>Ac
|
|
|
|-
| <sup>215</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 124
| 215.01919(9)
| 14(2) ms
| α
| <sup>211</sup>Ac
| 9/2-#
|
|
|-
| rowspan=2|<sup>216</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 125
| rowspan=2|216.01911(8)
| rowspan=2|105(12) ms
| α (80%)
| <sup>212</sup>Ac
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| [[베타 붕괴|β<sup>+</sup>]] (20%)
| <sup>216</sup>Th
|-
| <sup>217</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 126
| 217.01832(6)
| 3.48(9) ms
| α
| <sup>213</sup>Ac
| 9/2-#
|
|
|-
| rowspan=2 style="text-indent:1em" | <sup>217m</sup>Pa
| rowspan=2|
| rowspan=2 colspan="3" style="text-indent:2em" | 1860(7) keV
| rowspan=2|1.08(3) ms
| α
| <sup>213</sup>Ac
| rowspan=2|29/2+#
| rowspan=2|
| rowspan=2|
|-
| [[이성질핵 전이|IT]] (드묾)
| <sup>217</sup>Pa
|-
| <sup>218</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 127
| 218.020042(26)
| 0.113(1) ms
| α
| <sup>214</sup>Ac
|
|
|
|-
| rowspan=2|<sup>219</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 128
| rowspan=2|219.01988(6)
| rowspan=2|53(10) ns
| α
| <sup>215</sup>Ac
| rowspan=2|9/2-
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (5&times;10<sup>−9</sup>%)
| <sup>219</sup>Th
|-
| <sup>220</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 129
| 220.02188(6)
| 780(160) ns
| α
| <sup>216</sup>Ac
| 1-#
|
|
|-
| <sup>221</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 130
| 221.02188(6)
| 4.9(8) µs
| α
| <sup>217</sup>Ac
| 9/2-
|
|
|-
| <sup>222</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 131
| 222.02374(8)#
| 3.2(3) ms
| α
| <sup>218</sup>Ac
|
|
|
|-
| rowspan=2|<sup>223</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 132
| rowspan=2|223.02396(8)
| rowspan=2|5.1(6) ms
| α
| <sup>219</sup>Ac
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (0.001%)
| <sup>223</sup>Th
|-
| rowspan=2|<sup>224</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 133
| rowspan=2|224.025626(17)
| rowspan=2|844(19) ms
| α (99.9%)
| <sup>220</sup>Ac
| rowspan=2|5-#
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (0.1%)
| <sup>224</sup>Th
|-
| <sup>225</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 134
| 225.02613(8)
| 1.7(2) s
| α
| <sup>221</sup>Ac
| 5/2-#
|
|
|-
| rowspan=2|<sup>226</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 135
| rowspan=2|226.027948(12)
| rowspan=2|1.8(2) min
| α (74%)
| <sup>222</sup>Ac
| rowspan=2|
| rowspan=2|
| rowspan=2|
|-
| β<sup>+</sup> (26%)
| <sup>226</sup>Th
|-
| rowspan=2|<sup>227</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 136
| rowspan=2|227.028805(8)
| rowspan=2|38.3(3) min
| α (85%)
| <sup>223</sup>Ac
| rowspan=2|(5/2-)
| rowspan=2|
| rowspan=2|
|-
| [[전자 포획|ε]] (15%)
| <sup>227</sup>Th
|-
| rowspan=2|<sup>228</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 137
| rowspan=2|228.031051(5)
| rowspan=2|22(1) h
| β<sup>+</sup> (98.15%)
| <sup>228</sup>Th
| rowspan=2|3+
| rowspan=2|
| rowspan=2|
|-
| α (1.85%)
| <sup>224</sup>Ac
|-
| rowspan=2|<sup>229</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 138
| rowspan=2|229.0320968(30)
| rowspan=2|1.50(5) d
| ε (99.52%)
| <sup>229</sup>Th
| rowspan=2|(5/2+)
| rowspan=2|
| rowspan=2|
|-
| α (0.48%)
| <sup>225</sup>Ac
|-
| style="text-indent:1em" | <sup>229m</sup>Pa
|
| colspan="3" style="text-indent:2em" | 11.6(3) keV
| 420(30) ns
|
|
| 3/2-
|
|
|-
| rowspan=3|<sup>230</sup>Pa
| rowspan=3|
| rowspan=3 style="text-align:right" | 91
| rowspan=3 style="text-align:right" | 139
| rowspan=3|230.034541(4)
| rowspan=3|17.4(5) d
| β<sup>+</sup> (91.6%)
| <sup>230</sup>Th
| rowspan=3|(2-)
| rowspan=3|
| rowspan=3|
|-
| β<sup>-</sup> (8.4%)
| <sup>230</sup>U
|-
| α (0.00319%)
| <sup>226</sup>Ac
|-
| rowspan=4|<sup>231</sup>Pa
| rowspan=4|프로토악티늄
| rowspan=4 style="text-align:right" | 91
| rowspan=4 style="text-align:right" | 140
| rowspan=4|231.0358840(24)
| rowspan=4|3.276(11)&times;10<sup>4</sup> y
| α
| <sup>227</sup>Ac
| rowspan=4|3/2-
| rowspan=4|1.0000<ref group="n">[[우라늄-235|<sup>235</sup>U]]의 중간 [[붕괴 생성물]]</ref>
| rowspan=4|
|-
| [[뭉치 붕괴|CD]] (1.34&times;10<sup>−9</sup>%)
| <sup>207</sup>Tl<br /><sup>24</sup>Ne
|-
| [[자발 핵분열|SF]] (3&times;10<sup>−10</sup>%)
| 다양
|-
| CD (10<sup>−12</sup>%)
| '''<sup>208</sup>Pb'''<br /><sup>23</sup>F
|-
| rowspan=2|<sup>232</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 141
| rowspan=2|232.038592(8)
| rowspan=2|1.31(2) d
| β<sup>-</sup>
| <sup>232</sup>U
| rowspan=2|(2-)
| rowspan=2|
| rowspan=2|
|-
| ε (0.003%)
| '''''<sup>232</sup>Th'''''
|-
| <sup>233</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 142
| 233.0402473(23)
| 26.975(13) d
| β<sup>-</sup>
| <sup>233</sup>U
| 3/2-
|
|
|-
| rowspan=2|<sup>234</sup>Pa
| rowspan=2|우라늄 Z
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 143
| rowspan=2|234.043308(5)
| rowspan=2|6.70(5) h
| β<sup>-</sup>
| <sup>234</sup>U
| rowspan=2|4+
| rowspan=2|미량<ref group="n" name="us">[[우라늄-238|<sup>238</sup>U]]의 중간 붕괴 생성물</ref>
| rowspan=2|
|-
| SF (3&times;10<sup>−10</sup>%)
| 다양
|-
| rowspan=3 style="text-indent:1em" | <sup>234m</sup>Pa
| rowspan=3|우라늄 X<sub>2</sub><br />브레븀
| rowspan=3 colspan="3" style="text-indent:2em" | 78(3) keV
| rowspan=3|1.17(3) min
| β<sup>-</sup> (99.83%)
| <sup>234</sup>U
| rowspan=3|(0-)
| rowspan=3|미량<ref group="n" name="us" />
| rowspan=3|
|-
| IT (0.16%)
| <sup>234</sup>Pa
|-
| SF (10<sup>−10</sup>%)
| 다양
|-
| <sup>235</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 144
| 235.04544(5)
| 24.44(11) min
| β<sup>-</sup>
| '''''<sup>235</sup>U'''''
| (3/2-)
|
|
|-
| rowspan=2|<sup>236</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 145
| rowspan=2|236.04868(21)
| rowspan=2|9.1(1) min
| β<sup>-</sup>
| <sup>236</sup>U
| rowspan=2|1(-)
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, SF (6&times;10<sup>−8</sup>%)
| 다양
|-
| <sup>237</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 146
| 237.05115(11)
| 8.7(2) min
| β<sup>-</sup>
| <sup>237</sup>U
| (1/2+)
|
|
|-
| rowspan=2|<sup>238</sup>Pa
| rowspan=2|
| rowspan=2 style="text-align:right" | 91
| rowspan=2 style="text-align:right" | 147
| rowspan=2|238.05450(6)
| rowspan=2|2.27(9) min
| β<sup>-</sup>
| '''''<sup>238</sup>U'''''
| rowspan=2|(3-)#
| rowspan=2|
| rowspan=2|
|-
| β<sup>-</sup>, SF (2.6&times;10<sup>−6</sup>%)
| 다양
|-
| <sup>239</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 148
| 239.05726(21)#
| 1.8(5) h
| β<sup>-</sup>
| <sup>239</sup>U
| (3/2)(-#)
|
|
|-
| <sup>240</sup>Pa
|
| style="text-align:right" | 91
| style="text-align:right" | 149
| 240.06098(32)#
| 2# min
| β<sup>-</sup>
| <sup>240</sup>U
|
|
|
|}

== 각주 ==
<references/>
; 내용주
<references group="n" />

{{동위 원소 색인}}

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