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.
NewHalf-life is one of those terms everyone has heard but few actually understand well. Here's a no-nonsense breakdown of what it means, where it shows up, and why physicists care about it so much.
Read post →The BE/A curve is probably the single most important graph in nuclear physics. It explains why iron is so stable, why heavy nuclei undergo fission, and why light nuclei fuse. Let's walk through it.
Read post →Carbon-14 dating sounds straightforward — measure how much C-14 is left, calculate the age. But there are real limitations that people rarely talk about, including calibration curves and contamination.
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