Conservation of charge Conservation of the number of nucleons a Conservation of mass/energy (total energy) Conservation of linear momentum Conservation of angular momentum
Conservation of charge Conservation of the number of nucleons A Conservation of mass/energy (total energy) Conservation of linear momentum Conservation of angular momentum
2) Types of radioactive Decay Decay Type Reaction Description gamma(x) AP*- AP+y An excited nucleus decays to its ground state by the emission of a gamma photon alpha(a P A-4D+a An a particle is emitted leaving the daughter with 2 fewer neutrons and 2 fewer protons than the parent negatron(B-) 2P-2+AD+8-+D A neutron in the nucleus changes to a proton. An electron(6-)and an anti-neutrino(v)are emitted positron(+)分P→→z4D+B++ a proton in the nucleus changes into a neutron. A positron(B+)and a neutrino(v) are emitted
2) Types of Radioactive Decay
electron P+e--zAD"+y An orbital electron is absorbed by the capture(EC) nucleus, converts a nuclear proton into a neutron and a neutrino(v), and generally, leaves the nucleus in an excited state proton(p)2P→→ A-lD+p A nuclear proton is ejected from the nucleus neutron(n) P D+n A nuclear neutron is ejected from the nucleus internal con P*-+[ZP]++e- The excitation energy of a nucleus is version(IC) used to eject an orbital electron (usually a K-shell)electron
Photographic ate Magnetic Field T P XXXX XXXX Collimator Radioactive Element Apparatus similar to that used by henri becquerel to determine the magnetic deflection of radioactive decay products. The magnetic field is perpendicular to the direction of motion of the decay products
Apparatus similar to that used by Henri Becquerel to determine the magnetic deflection of radioactive decay products. The magnetic field is perpendicular to the direction of motion of the decay products
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 nucleus
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 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