| Element | Symbol | Number | Compound/form/isotope | Price ($/kg by compound weight) | Price ($/kg by element weight) | Date range | Ref |
|---|---|---|---|---|---|---|---|
| Actinium | Ac | 89 | 225Ac 99% pure [1] | $1203/mCi with permit | e12 $6.98e12 | Fiscal year 2003 | [1][2] |
- ^ mCi/kg = [Avogadro's number]/[atomic weight]*(1-10^(log(.5)/[half life in seconds]))/37000