3 Energetics of radioactive decay The law of conservation of mass and energy covers all reactions Sum of mass before reaction Sum of mass after reaction +Q Q= Sum of mass before reaction- Sum of mass after reaction Energy in Radioactive Dec Before decay Interesting Items Spectrum(能谱) of particles Energy in gamma decay Energy in beta decay Energy in alpha decay Recoiling nucleusThe law of conservation of mass and energy covers all reactions. Sum of mass before reaction = Sum of mass after reaction + Q Q = Sum of mass before reaction - Sum of mass after reaction Energy in Radioactive Decay Before decay Recoiling nucleus   Interesting Items: Spectrum（能谱） of particles Energy in gamma decay Energy in beta decay Energy in alpha decay 3) Energetics of Radioactive Decay