Cathode (x-ray tube)
Updates to Article Attributes
The cathode is part of an x-ray tube and serves to expel the electrons from the circuit and focus them in a beam on the focal spot of the anode. It is a controlled source of electrons for the generation of x-ray beams. The electrons are produced by heating the filament (Joule(Joule heating effect) i.e. a coil of wire made from tungsten, placed within a cup-shaped structure, a highly polished nickel focusing cup, providing electrostatic focusing of the beam on the anode.
In order to expel the electrons from the system, they need to be given the energy. Heat is used to expel the electrons from the cathode. The filament is crystallised during construction and its crystallised structure gives the filament stability. The process is called thermionic emission (or Edison effect). The filament is heated with the electric current passing through it (to the glowing temperature) and the electrons are then expelled from the cathode.
-<p>The <strong>cathode</strong> is part of an <a href="/articles/x-ray-tube-1">x-ray tube</a> and serves to expel the electrons from the circuit and focus them in a beam on the focal spot of the anode. It is a controlled source of electrons for the generation of x-ray beams. The electrons are produced by heating the filament (Joule heating effect) i.e. a coil of wire made from tungsten, placed within a cup-shaped structure, a highly polished nickel focusing cup, providing electrostatic focusing of the beam on the anode.</p><p>In order to expel the electrons from the system, they need to be given the energy. Heat is used to expel the electrons from the cathode. The filament is crystallised during construction and its crystallised structure gives the filament stability. The process is called thermionic emission (or Edison effect). The filament is heated with the electric current passing through it (to the glowing temperature) and the electrons are then expelled from the cathode.</p>- +<p>The <strong>cathode</strong> is part of an <a href="/articles/x-ray-tube-1">x-ray tube</a> and serves to expel the <a title="Electrons" href="/articles/electron">electrons</a> from the circuit and focus them in a beam on the <a title="Focal spot" href="/articles/focal-spot">focal spot</a> of the <a title="Anode" href="/articles/anode-1">anode</a>. It is a controlled source of electrons for the generation of x-ray beams. The electrons are produced by heating the filament (<a title="Joule heating effect" href="/articles/joule-heating-effect">Joule heating effect</a>) i.e. a coil of wire made from tungsten, placed within a cup-shaped structure, a highly polished <a title="nickel" href="/articles/nickel">nickel</a> focusing cup, providing electrostatic focusing of the beam on the anode.</p><p>In order to expel the electrons from the system, they need to be given the energy. Heat is used to expel the electrons from the cathode. The filament is crystallised during construction and its crystallised structure gives the filament stability. The process is called <a title="Thermionic emission" href="/articles/thermionic-emission">thermionic emission</a> (or Edison effect). The filament is heated with the electric current passing through it (to the glowing temperature) and the electrons are then expelled from the cathode.</p>
References changed:
- 1. Lazic J, Sobic V, Cikaric S. et al.Radiologija (Radiology – Unviersity Manual), Medicinska Knjiga, Belgrade 1997
- 2. Sprawls P. The Physical Principles of Medical Imaging, 2nd Ed. 1995, Medical Physics Pub. (Madison, Wis)
- 3. Stankovic JB, Milosevic NT. Osnovi radioloske fizike (Basic Principles of Radiological Physics), PTT, Belgrade, 2007
- 4. M L Taubin, D A Chesnokov, A A Pavlov. Cathodes for medical purpose X-ray tubes. Journal of Physics: Conference Series. 808 (1): 012004. <a href="https://doi.org/10.1088/1742-6596/808/1/012004">doi:10.1088/1742-6596/808/1/012004</a> <span class="ref_v4"></span>
- 1. Lazic J, Sobic V, Cikaric S. et al.Radiologija (Radiology – Unviersity Manual), Medicinska Knjiga, Belgrade 1997
- 2. Sprawls P. The Physical Principles of Medical Imaging, 2nd Ed. 1995, Medical Physics Pub. (Madison, Wis)
- 3. Stankovic JB, Milosevic NT. Osnovi radioloske fizike (Basic Principles of Radiological Physics), PTT, Belgrade, 2007
- 4. Taubin ML, Platonov VF, Yaskolko AA. X-Ray Tube Cathodes of Medical Purpose. Biomedical Engineering, Vol. 43, No. 1, 2009, pp. 48-50
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