Radioactive Decay Calculator

Calculate remaining activity of radioactive isotopes over time.

Parameters

Isotope

Initial Activity (Units)

Any unit works (Ci, Bq, CPM) as long as you use the same for result.

Elapsed Time (days)

Remaining Activity

Current Activity

Safety Note

Radioactive materials must be handled according to your institution's safety guidelines. This calculator provides theoretical values and does not account for biological clearance or other factors.

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