Nuclear Decay Calculator
Calculate radioactive decay using the exponential decay law
Common Radioactive Isotopes
Carbon-14: 5730 years
Uranium-238: 4.468e9 years
Radon-222: 3.82 days
Iodine-131: 8.02 days
Cobalt-60: 5.27 years
Technetium-99m: 6.01 hours
Formulas Used
N(t) = N₀ × (1/2)^(t/t_half) = N₀ × e^(-λt)
λ = ln(2) / t_half
Activity: A = λN
Mean lifetime: τ = 1/λ
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: University Physics
by Young & Freedman
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.