Radioactive Decay & Half-Life Calculator
Uses exponential decay to find how much of a sample is left after a time, or the age of a sample from the fraction remaining, with isotope presets including carbon-14.
Read the full guide to this tool
Results
Notes
- Each half-life halves what remains: after 3 half-lives one eighth is left, regardless of the starting amount.
- Carbon-14 dating reads the age from how much ¹⁴C has decayed since the organism died, useful to about 50,000 years.
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