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| Basic component of the cathode |
1-Filament
2-Focusing Cup |
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noypi69 Tue, 27 Jan 2009 02:51:18 GMT |
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| the metallic surface usually of platinum or tungsten upon which the stream of cathode rays within an xray tube is focused and from which the xrays are emitted |
target |
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noypi69 Tue, 27 Jan 2009 02:51:18 GMT |
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| a cloud of electrons in the vicinity of the filament |
space charge |
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noypi69 Tue, 27 Jan 2009 02:51:18 GMT |
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| a negatively charged metal shroud in which the filament is embedded |
focusing cup |
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noypi69 Tue, 27 Jan 2009 02:51:18 GMT |
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| a tenuous conductor made incandescent by the passage of an electric current |
filament |
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noypi69 Tue, 27 Jan 2009 02:51:18 GMT |
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| to tend or move toward one point or another |
coverage |
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noypi69 Tue, 27 Jan 2009 02:51:18 GMT |
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| List basic components of the xray tube |
1-Cathode
2-Anode
3-Glass envelope |
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noypi69 Tue, 27 Jan 2009 02:45:36 GMT |
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| a shaft made of bars of copper and soft iron fabricated in one mass, located inside the xray glass envelope. |
Rotor |
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noypi69 Tue, 27 Jan 2009 02:45:36 GMT |
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| used for glass and glassware that contains appreciable oxide of boron and is resistant to heat chemicals and electricity |
Pyrex |
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noypi69 Tue, 27 Jan 2009 02:45:36 GMT |
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| the electron emitting electrode of an electron tube |
Cathode |
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noypi69 Tue, 27 Jan 2009 02:45:36 GMT |
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| the electron-collecting electrode of an electron tube |
Anode |
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noypi69 Tue, 27 Jan 2009 02:45:36 GMT |
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| types of modern xray tube designs |
1-Rotating anode xray tube
2-Grid-controlled xray tube
3-Mammography xray tube
4-Metal/Ceramic xray tube |
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noypi69 Tue, 27 Jan 2009 02:45:36 GMT |
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| Characteristics of a hot cathode |
1-compatible for use with snook transformer
2-Vacuum tube allows intensity and energy to be selected separately and with great accuracy
3-Normally made of two electrodes(a diode in a glass tube |
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noypi69 Tue, 27 Jan 2009 02:45:36 GMT |
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| characteristics of crookes tube |
1-contained controlled quantities of gas
2-inefficient producer of xrays
3-tube mA could not be changed independently of kV making control of technical factors difficult
4-made of 2 electrodes(a diode) in a glass tube. |
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noypi69 Tue, 27 Jan 2009 02:37:06 GMT |
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| an electron tube with an anode, a cathode and controlling grid. |
Triode |
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noypi69 Tue, 27 Jan 2009 02:37:06 GMT |
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| a metallic element that resembles chromium and tungsten in many properties is used especially in strengthening and hardening steel |
Molybdenum |
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noypi69 Tue, 27 Jan 2009 02:37:06 GMT |
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| the negative potential across a triode of a grid controlled tube |
Grid Bias |
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noypi69 Tue, 27 Jan 2009 02:37:06 GMT |
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| a large partially evacuated glass tube |
Crookes tube |
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noypi69 Tue, 27 Jan 2009 02:37:06 GMT |
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| a vacuum xray tube which allowed xray intensity and energy to be selected separately and with great accuracy |
Coolidge tube |
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noypi69 Tue, 27 Jan 2009 02:37:06 GMT |
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| high speed electrons projected in a stream from the heated cathode of a vacuum tube under the propulsion of a strong electric field. |
Cathode ray |
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noypi69 Tue, 27 Jan 2009 02:37:06 GMT |
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| a steel gray light weight corrosion resistant rigid metallic element used chiefly as a hardening agent |
Beryllium |
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noypi69 Tue, 27 Jan 2009 02:37:06 GMT |
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| Steps necessary for production of high speed electrons |
a-hihg potential difference, kV applied across tube.
1-gives filament very high negative charge.
2-gives anode an equally high positive charge.
b-high electric field causes space charge electrons to rush from cathode to anode at extremely high speeds |
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noypi69 Tue, 27 Jan 2009 02:28:08 GMT |
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| Steps necessary for the separation of electrons |
a-filament current supplying filament(cathode), causes it to become incandescent resulting in separation of outer orbital electrons.
b-electrons escaping from filament forms space charge(or electron cloud) nearby.
c-process of liberation by heating conductor |
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noypi69 Tue, 27 Jan 2009 02:28:08 GMT |
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| Conditions necessary for the production of x-rays |
1-Separation of electrons
2-Production of high speed electrons
3-Focusing of electrons
4-Stopping of high speed electrons in target (anode) |
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noypi69 Tue, 27 Jan 2009 02:28:08 GMT |
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| Basic principles of x-ray production |
1-Fast moving electrons undergo rapid deceleration.
2- Electrons drop from an outer shell to a hole in an inner atomic shell. |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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| an electrically charged particle emitted by an incandescent substance. |
Thermions |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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| the giving off of electrons from the surface of a heated metal |
Thermionic emission |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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| a low current of electricity which flows through the filament of the cathode |
Filament current |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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| White, glowing or luminous with intense heat |
Incandescent |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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Unveiled the hot cathode xray tube in 1913.
Recognized as far superior to the crookes tube. |
William D. Coolidge |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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Countes as the first xray fatality in the united states in 1904.
had amputation of both arms due to xray burns. |
Clarence Dally |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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Developed the fluoroscope 1898.
Original fluorescent material used.
Abondaoned xray research after his assistant received severe xray burns. |
Thomas Edison |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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Demonstrated technique of reducing exposure times and enhancing the image by using double emulsion radiography in 1904.
Two glass x-ray plates placed with emulsion surfaces together. |
Charles Leonard |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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| Demonstrated technique of reducing exposure times by using an intensifying screen in conjuntion with glass photographic plates in 1896 |
Micheal Pupin |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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Professor of Physics, Wurzburg University, Germany.
Discovered X-rays Nov 8 1895
1901 Received the first nobel prize for physics |
Wilhelm Conrad Roentgen |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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Developed a large partially evacuated glass tube.
fore runner of modern fluorescent/neon sign type lamps. |
Sir William Crookes |
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noypi69 Tue, 27 Jan 2009 02:19:38 GMT |
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