4 free nuclear calculators and tools. Solve real-world nuclear problems instantly with accurate, step-by-step results on ApexCalc.
| Constant | Symbol | Value |
|---|---|---|
| Speed of light | c | 2.99792458×10⁸ |
| Planck's constant | h | 6.62607015×10⁻³‴ |
| Boltzmann constant | kʙ | 1.380649×10⁻²³ |
| Avogadro's number | Nₐ | 6.02214076×10²³ |
| Gravitational constant | G | 6.6743×10⁻¹¹ |
| Gas constant | R | 8.31446 |
| Elementary charge | e | 1.602176634×10⁻¹⁹ |
| Electron mass | mₑ | 9.1093837015×10⁻³¹ |
| Proton mass | mₚ | 1.67262192369×10⁻²⁷ |
| Fine-structure constant | α | 7.2973525693×10⁻³ |
Calculate radioactive decay activity, remaining quantity, dose rate, and decay chain buildup for common isotopes using the decay law.
Calculate thermal neutron flux, reactor power density, and four-factor formula (k∞) for reactor criticality analysis.
Calculate required shielding thickness for gamma and X-ray radiation using half-value layer (HVL) and linear attenuation coefficients for lead, concrete, and steel.
Calculate residual decay heat after reactor shutdown using the ANS-5.1 decay heat standard. Critical for fuel storage and accident analysis.