Radioactive Decay Calculator
Calculate remaining radioactive activity from initial activity, half-life, and elapsed time.
Inputs
Bq
Results
Remaining Activity
314,980.26 Bq
Fraction Remaining0.32
Percent Decayed68.5%
Half-Lives Elapsed1.67
Decay Constant (λ)0 /unit time
Mean Lifetime (τ)43.28
Time to 1% Remaining199.32
Time to 0.1% Remaining298.97
How to Use This Calculator
- Enter Initial Activity, Half-Life, and Time Unit.
- Set Elapsed Time.
- Review the Remaining Activity (Bq) result.
- Use Fraction Remaining and Percent Decayed (%) to inform your decision.
- Use the chart to visualize the results and explore different scenarios by adjusting inputs.
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