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PowerPoint Presentation Gamma radiation is actually a part of the high energy end of the EM Spectrum Increasing Energy In nuclear decay processes, gamma radiation is a way For an excited, or metastable, nucleus to get rid of excess energy It occurs typically as part of an alpha or beta decay process in which the nucleus is left in a high energy state
Slide 1 Rutherford’s Alpha Scattering Experiment Distance of Closest Approach (Nuclear Size) Impact Parameter Composition of Nucleus Atomic Number, Mass Number and Atomic Mass Unit Radius of the Nucleus and Nuclear Density Mass Energy Relation and Mass Defect Binding Energy and Binding Energy per Nucleon Binding Energy Curve and Inferences
Radioactivity Powerpoint a Differentiate between alpha and beta particles and gamma radiation b Differentiate between fission and fusion c Explain the process half-life as related to radioactive decay d Describe nuclear energy, its practical application as an alternative energy source, and its potential problems
Analysis of multiple end points in clinical trials PAAS Method Procedure Li and Mehrotra (2008) proposed a multiple testing procedure, which they referred to as the adaptive alpha allocation approach or 4A procedure Consider a clinical trial with m endpoints and assume that the endpoints are grouped into two families
Quantum Mechanics of Alpha Decay - MIT Can be fit per decay chain, element, etc Dependence on mass and atomic numbers, atomic radius Quantum mechanics offers explanation for alpha decay Yung-Kuo Lim, 2000 10 min * * * * * Sheet3
PowerPoint Presentation What is energy of alpha? (in MeV and J) What is the velocity of the alpha? (m s) m = 6 64x10-27 kg 5 439 MeV, 8 713 x 10-13 J, 1 62 x 107 m s Why Alpha Decay TOC Only possible if mass products < parent Tendency to reduce potential energy Larger nuclei He nucleus is rather tightly bound He Nucleus Tunneling - Energy is not conserved!