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| 90| rowspan=2 style="text-align:right" | 135| rowspan=2|225.0239510(55)| rowspan=2 style="text-align:center" | | rowspan=2|8.75(4) min| ? (~90%)| ²²¹Ra| rowspan=2|3/2+| rowspan=2|| rowspan=2||-| EC (~10%)| ²²⁵Ac|-id=Thorium-226| rowspan=2|²²⁶Th| rowspan=2|| rowspan=2 style="text-align:right" | 90| rowspan=2 style="text-align:right" | 136| rowspan=2|226.0249037(48)| rowspan=2 style="text-align:center" | | rowspan=2|30.70(3) min| ?| ²²²Ra| rowspan=2|0+|

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