RAD 330 Lecture Notes - Lecture 1: Space Charge, Atomic Orbital, Tungsten
23 May 2022
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"""""d " """"""": absorbs any , provides tube - cooling stray " radiation [z tube directed towards a. Focusing cup : part of cathode assembly, low negative charge, controls electron cloud, composed of nickel (ni) Thermionic emission: release of electrons from a heated filament. Ma time = mas: if sufficiently heated , electrons are "boiled off" of the filament wire resulting in electron cloud (space charge) Anode types : stationary target t tungsten, rotating. A- this one is in class copper n - Dual - filament cathode : two individual filaments, one larger than the other, tech selects filament to be heated based on exam type, filament selection controls focal spot size (fss) Small filament -_ small focal spot: smaller parts , ex extremities improved dentail /sharpness large filament = large focal, larger parts that require a larger ma, reduced detail /sharpness, width of the incident electron beam is.
