gamma_methods

gamma_methods - Experiments in Modern Physics Introductory...

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Experiments in Modern Physics Introductory Lab: Gamma Spectroscopy Methods Rex Tayloe Department of Physics, Indiana University 1/14/03 Last Revised: 9/4/03 Goal Become familiar with operating a scintillation detector and Multichannel Analyzer (MCA). Use this equipment to investigate and understand the gamma-ray spectra of several radioactive sources. Introduction In elementary modern physics, you learned of several different ways in which quanta of electromagnetic energy, or photons , can interact with matter. The three dominant processes include: the photoelectric effect, in which all of the photon's energy is transferred to a single electron; Compton scattering, in which the photon scatters from an electron, transferring some of its energy, but re-emerging as a lower-energy photon; and pair production, whereby the photon converts to a positron-electron (e + e - ) pair. In this lab, you will investigate processes involving high-energy photons, or γ -rays, where in this context "high energy" means on the scale of nuclear energy level spacings, i.e., several MeV or so. Note that an MeV is many thousands of times larger than typical atomic energies, so the fact that the struck electrons are bound in matter
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gamma_methods - Experiments in Modern Physics Introductory...

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