{| class="wikitable" style="margin:auto;"
!width="80"|nuklid
!width="90"|historisk navn (kort)
!width="120"|historisk navn (langt)
!width="100"|henfalds-type
!width="100"|halveringstid<br />(''a''=år)
!width="60" |frigjort energi, MeV
!width="100"|henfaldsprodukt
|-
| align="center"| [[Plutonium-239|<sup>239</sup>Pu]]
| align="center"|
| align="center"|
| align="center"| [[alfahenfald|α]]
| align="center"| 2.41•10<sup>4</sup> a
| align="center"| 5.244
| align="center"| <sup>235</sup>U
|-
| align="center"| <sup>235</sup>U
| align="center"| AcU
| align="center"| Actin Uran
| align="center"|  α
| align="center"| 7.04•10<sup>8</sup> a
| align="center"| 4.678
| align="center"| [[Thorium-231|<sup>231</sup>Th]]
|-
| align="center"| <sup>231</sup>Th
| align="center"| UY
| align="center"| Uran Y
| align="center"| [[betahenfald|β<sup>−</sup>]]
| align="center"| 25.52 h
| align="center"| 0.391
| align="center"| [[Protactinium-231|<sup>231</sup>Pa]]
|-
| align="center"| <sup>231</sup>Pa
| align="center"|
| align="center"| Protactinium
| align="center"| α
| align="center"| 32760 a
| align="center"| 5.150
| align="center"| [[Actinium-227|<sup>227</sup>Ac]]
|-
| align="center"| <sup>227</sup>Ac
| align="center"| Ac
| align="center"| Actinium
| align="center"| β<sup>−</sup> 98.62% <br /> α 1.38%
| align="center"| 21.772 a
| align="center"| 0.045 <br /> 5.042
| align="center"| [[Thorium-227|<sup>227</sup>Th]] <br /> [[Francium-223|<sup>223</sup>Fr]]
|-
| align="center"| <sup>227</sup>Th
| align="center"| RdAc
| align="center"| Radioactinium
| align="center"|  α
| align="center"| 18.68 d
| align="center"| 6.147
| align="center"| [[Radium-223|<sup>223</sup>Ra]]
|-
| align="center"| <sup>223</sup>Fr
| align="center"| AcK
| align="center"| Actinium K
| align="center"|  β<sup>−</sup> 99.994% <br /> α 0.006%
| align="center"| 22.00 min
| align="center"| 1.149 <br /> 5.340
| align="center"| <sup>223</sup>Ra <br /> [[Astatine-219|<sup>219</sup>At]]
|-
| align="center"| <sup>223</sup>Ra
| align="center"| AcX
| align="center"| Actinium X
| align="center"|  α
| align="center"| 11.43 d
| align="center"| 5.979
| align="center"| [[Radon-219|<sup>219</sup>Rn]]
|-
| align="center"| <sup>219</sup>At
| align="center"|
| align="center"|
| align="center"|  α 97.00% <br /> β<sup>−</sup> 3.00%
| align="center"| 56 s
| align="center"| 6.275 <br /> 1.700
| align="center"| [[Bismuth-215|<sup>215</sup>Bi]] <br /> <sup>219</sup>Rn
|-
| align="center"| <sup>219</sup>Rn
| align="center"| An
| align="center"| Actinon,<br />Actinium Emanation
| align="center"|  α
| align="center"| 3.96 s
| align="center"| 6.946
| align="center"| [[Polonium-215|<sup>215</sup>Po]]
|-
| align="center"| <sup>215</sup>Bi
| align="center"|
| align="center"|
| align="center"|  β<sup>−</sup>
| align="center"| 7.6 min
| align="center"| 2.250  	
| align="center"| <sup>215</sup>Po
|-
| align="center"| <sup>215</sup>Po
| align="center"| AcA
| align="center"| Actinium A
| align="center"|  α 99.99977% <br />  β<sup>−</sup> 0.00023%
| align="center"| 1.781 ms
| align="center"| 7.527 <br /> 0.715
| align="center"| [[Bly-211|<sup>211</sup>Pb]] <br /> [[Astat-215|<sup>215</sup>At]]
|-
| align="center"| <sup>215</sup>At
| align="center"|
| align="center"|
| align="center"|  α
| align="center"| 0.1 ms
| align="center"| 8.178
| align="center"| [[Bismuth-211|<sup>211</sup>Bi]]
|-
| align="center"| <sup>211</sup>Pb
| align="center"| AcB
| align="center"| Actinium B
| align="center"|  β<sup>−</sup>
| align="center"| 36.1 min
| align="center"| 1.367
| align="center"| <sup>211</sup>Bi
|-
| align="center"| <sup>211</sup>Bi
| align="center"| AcC
| align="center"| Actinium C
| align="center"|  α 99.724% <br />  β<sup>−</sup> 0.276%
| align="center"| 2.14 min
| align="center"| 6.751 <br /> 0.575
| align="center"| [[Thallium-207|<sup>207</sup>Tl]] <br /> [[Polonium-211|<sup>211</sup>Po]]
|-
| align="center"| <sup>211</sup>Po
| align="center"| AcC'
| align="center"| Actinium C'
| align="center"|  α
| align="center"| 516 ms
| align="center"| 7.595
| align="center"| [[Bly-207|<sup>207</sup>Pb]]
|-
| align="center"| <sup>207</sup>Tl
| align="center"| AcC"
| align="center"| Actinium C"
| align="center"| β<sup>−</sup>
| align="center"| 4.77 min
| align="center"| 1.418
| align="center"| <sup>207</sup>Pb
|-
| align="center"| <sup>207</sup>Pb
| align="center"| AcD
| align="center"| Actinium D
| align="center"| .
| align="center"| stabilt
| align="center"| .
| align="center"| .
|}
Kemi