核裂变能量计算器
计算核裂变反应释放的能量，根据反应物和产物的质量差估算能量释放，了解核裂变的能量转换过程。
Energy Released per Fission
207.82 MeV
Energy Released per Fission vs Total Mass of Reactants
公式
Nuclear Fission Energy
Fission releases energy because the products have higher binding energy per nucleon than the parent nucleus. The energy comes from the mass difference between reactants and products.
Formula
E = delta_m × 931.494 MeV/u
A typical U-235 fission releases about 200 MeV, which is roughly 80 million times more energy per reaction than a typical chemical reaction (~2.5 eV for TNT).
计算示例
U-236 fissions: total reactant mass 236.0526 u, total product mass 235.8295 u.
- 01delta_m = 236.0526 - 235.8295 = 0.2231 u
- 02E = 0.2231 × 931.494 = 207.8 MeV
- 03E = 207.8 × 1.602 × 10⁻¹³ = 3.33 × 10⁻¹¹ J per fission
常见问题
How much energy does 1 kg of U-235 produce?
About 8.2 × 10¹³ J (82 TJ), equivalent to about 20,000 tons of TNT. This is roughly 2 million times the energy content of coal per unit mass.
Where does the fission energy go?
About 85% goes to kinetic energy of fission fragments, 2.5% to prompt neutrons, 2.5% to prompt gamma rays, 3% to beta decay energy, 3% to delayed gamma rays, and 4% to antineutrinos (lost).
What about energy from fusion vs fission?
Per reaction, fission releases more energy (~200 MeV vs ~17.6 MeV for D-T fusion). But per unit mass, fusion releases more because the fuel is much lighter. Fusion fuel has about 4x the energy density.
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