HalfLife: Decay Calculator

TipTinker

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About this app

Turn a half-life, a starting amount and an elapsed time into the amount left, the percent remaining, the decay constant and a decay curve you can read at a glance. Four calculators in one app.

• Decay: solve for the remaining amount, the elapsed time or the half-life itself
• Activity: convert mass, moles, atoms and activity (Bq, Ci) of a radionuclide, with specific activity
• Dosing: repeated doses with first-order elimination, from accumulation to steady-state peak and trough (a mathematical model, not medical advice)
• Growth: final amount, doubling time or time to a target
• Sixteen isotope presets with NUBASE2020 half-lives, from technetium-99m and iodine-131 to carbon-14 (Cambridge and Libby values) and uranium-238
• Times from seconds to billions of years, with scientific notation for huge or tiny values
• Milestones at 1, 2, 3, 4, 5 and 10 half-lives
• Save scenarios you check often and share results

Useful for radiocarbon dating exercises, tracer and lab work, and physics or chemistry homework. Results are for education and reference only; real dating needs calibration.

What’s new

Performance improvements and bug fixes