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Thermionic emission and Radiation and half-lives.
Member rating: No Rating | Words: | Submitted: Wed Jan 26 2005
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Introduction For the write-up section of my coursework I went on a trip to the Kent and Canterbury Hospital in order to look at the application of physics within the field of medicine. I intend to spend time explaining two physics principles which have uses in this scientific field, and illustrate how they are used, either within the diagnosis or treatment of a patient. Two principles: 1. Thermionic emission. 2. Radiation and half-lives. Thermionic emission Thermionic emission is a phenomenon by which electrons are emitted from the surface of a metal or metal oxide. The flow of these electrons can only occur when the thermal vibrational energy of the matrix overcomes the electrostatic forces preventing the electrons leaving the surface. Thermionic emission is entirely reliant upon the 'sea of free electrons'. This is the collective name given to the one or two electrons per atom, in any metal, which are free to move around and...
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