Calculate remaining quantity of a radioactive substance over time. Supports custom isotopes, decay constant, mean lifetime and plots a visual decay curve.
Most UsedCompute total binding energy, binding energy per nucleon and mass defect for any nucleus. Uses real atomic mass data with BE/A stability graph.
EssentialConvert between mass and energy using Einstein's equivalence. Supports kg, atomic mass units, MeV, joules, electron volts and ergs.
PopularCalculate activity in Becquerels or Curies, decay constant, mean lifetime and remaining atoms. Pre-loaded with 100+ isotope half-lives.
EssentialCalculate nucleus radius using R = R₀ A^(1/3). Compares nuclear sizes visually and computes nuclear density and volume.
VisualEstimate age of organic material via Carbon-14 decay. Enter remaining C-14 percentage and get estimated age with uncertainty range.
PopularInteractive decay series visualization — U-238, Th-232 and U-235 chains. Shows every alpha and beta decay step until stable lead.
VisualCalculate Q-value of any nuclear reaction. Determines exothermic vs endothermic and computes kinetic energy released or required.
AdvancedEstimate reaction rates from cross-section data. Input beam flux, target density and cross-section in barns to get interaction probabilities.
AdvancedDifferential cross-section for Coulomb scattering. Input projectile energy, charge numbers and scattering angle for the Rutherford formula result.
AdvancedLook up mass excess values for any nuclide. Searchable table with mass excess in MeV, atomic mass in amu, and nuclear stability info.
NewAbsorbed dose, equivalent dose and effective dose from a source. Includes shielding thickness estimator for lead, concrete and water.
NewThree letters, one number, and an equals sign. The most famous equation in history. But what does it actually say about mass, energy, and nuclear reactions?
Read post →The full breakdown of the half-life formula with worked problems. From simple cases to finding elapsed time and decay constants.
Read post →From Polonium-214's 164 microseconds to Rubidium-87's 50 billion years. Comprehensive tables for medical, geological, and environmental isotopes.
Read post →Alpha, beta, gamma — how each decay mode works at the nuclear level, the exponential decay law, and decay chains explained.
Read post →The science behind radiocarbon dating, calibration curves, the 50,000-year limit, and why nuclear weapons testing accidentally helped forensic science.
Read post →The single most important graph in nuclear physics. It explains fusion, fission, stellar evolution, and why elements heavier than iron need a supernova.
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