Photoelectric process INCIDENT PHOTON FAST ELECTRON CHARACTERISTIC X-RAY z KE=hV-E ph(e)o p3 B a very crude approximation
KE=h-EB Photoelectric process a very crude approximation
Compton Effect of Gamma Rays Spectra of an Original and Scattered X-rays at a Particular Fixed Angle When a photon transfers part of its energy to an Intensity Origin: electron, and the photon arbitrary becomes less energetic is scale spectrum called Compton effect E Feynman Diagram for E the compton effect 1+(E/mec2)(1-cos 8s scattered spectrum 入 (E)=7z2(1-2入-22)n(1+5)+ 2(1+9+82+2A3 (λ+2 入≡mc2/E r is the classical electron radius
Compton Effect of Gamma Rays Spectra of an Original and Scattered X-rays at a Particular Fixed Angle. Intensity arbitrary scale Original spectrum scattered spectrum Feynman Diagram for the Compton Effect When a photon transfers part of its energy to an electron, and the photon becomes less energetic is called Compton effect. re is the classical electron radius
Pair Production of Gamma Rays Feynman Diagram for Pair production A nucleus or fie A negative charge in reverse is equivalent to a plus charge Gamma photons with energy greater than 1.02 Mev produce a electron-positron pair is called pair production The fate of the positron
Pair Production of Gamma Rays Feynman Diagram for Pair Production A negative charge in reverse is equivalent to a plus charge. A nucleus or field. Gamma photons with energy greater than 1.02 MeV produce a electron-positron pair is called pair production. The fate of the positron?
Gamma-ray Three Modes of Interaction with Matter Interaction of photons with matter Photo- Pair electric production Compton scattering 5/MeV Photoelectric effect Compton scattering pair production
Gamma-ray Three Modes of Interaction with Matter Interaction of Photons with Matter 1 5/MeV Pair production Photoelectric Compton scattering Photoelectric effect Compton scattering pair production
TTn TTTTTE M Shel L Shell 10 Coherer scattering K Shel Photoelectric effect Fr ee e Pair Incoherent production scattering Bound e 10 10 10 10 10 Energy(Mev)