Study Rad Techinque Unit 4 Flash Cards

 
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Rad Techinque Unit 4

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Average voltage and amperage of the negative terminal on the cathode
10V
3-5 amps
The metallic surface usually of platinum or tungsten upon which the stream of cathode rays within an x-ray tube is focused and from which the x-rays are emitted
Target
A cloud of electrons in the vicinity of the filiament
Space Charge
A negatively charged metal shroud in which the filament is embedded
Focusing cup
A tenuous conductor made incandescent by the passage of an electric current
Filament
To tend to move towards one point or another
Converge
Maintains vacuum in the Glass envelope
Pyrex Envelope
Turns the targe to spread out heat loading,
Made of 2 parts
Rotor/Stator
Induction Motor
Concentrates the cathode stream
Focus cup in Cathode
Provides source of electrons
Filament in a Cathode
A shaft made of bars of copper and soft iron fabricated in one mass, located inside the x-ray glass envelope
Rotor
Used for glass and glassward that contains appreciable oxide of boron and is resistant to heat chemicals and electricity
Pyrex
The electron emitting electrode of an electron tube
Cathode
The electron-collecting electronde or an electron tube
Anode
Metal/Ceramic x-ray tube
High Performance x-ray tube (super rolatix)
Metal Casing instead of glass
Anode rotates on axle
Mammography X-ray tube
Operated at low kilovoltage (<50kvp)
Molybdenum anode
Beryllium Window
Grid-controlled x-ray tube known as
Triode
Rotating anode X-ray tube was introduced...
Commercially available since...
1929
1936
Characterisitcs of a HOT CATHODE x-ray tube

AKA: Coolidge Tube
Compatable for use with the Snook transformer
Vacuum tube allowes intensity and energy to be selected separatley and with great accuracy
Normally made of two electrodes in a glass tube
Characterisitics of the Crooks tube
Fewer Xrays produced
More heat generated
Electron flow hindered|
An electron tube with an anode, a cathode, and controlling grid
Iriode
A large partially evacuated glass tube developed by Sir William Crookes
Crookes tube
When was the Coolidge Tube introduced to the medical community
1913 by William D. Coolidge
A vacuum x-ray tube which allowed X-ray intensity and energy to be selected seperatly and with great accuracy
Coolidge Tube
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
A steel-grey, light weight corrosion resistant, rigid metallic element used chiefly as a hardening agent
Beryllium
In breaking radiation targerts with hgih atomic numbers cause..
Faster Deceleration of electron speed
Emission of characterisitic radiation constitute what percent of emitted X-rays between 80-100 KVP?
10%
In the case of breaking radiation what is the percentage of emitted X-rays when the tube potential is 80-100 kV
90%
at 80 kV how much energy is heat
99.4%
at 80 kV how much energy is X-ray
.6%
The narrower the electron beam, the smaller the focus..
Teh sharper the x-ray image
Speed of Light
186,000 Miles per second
Term for Liberated electrons
Thermions
Conditions necessary for the production of X-rays
Separation of electrons
Production of high speed electrons
Focusing of electrons
Stopping of high speed electrons in target (anode)
Basic principles of X-ray production
Fast-moving electrons undergo rapid deceleration

Electrons drop from an outershell to a hole in an inner atomic shell
An electrically charged particle emitted by an incandesecent substance
Thermions
The giving off of electrons from the surface of a heated metal
Thermionic emission
A low current of electricity which flows through the filament of the cathode
Filament Current
White glowing or luminous with intense heat
Incandecent
Unveiled the hot-cathode x-ray tube in 1913
Reconized as far superior to the crooks tube
William D Coolidge
Counted as the first X-ray death in US in 1904
Clarence Dally
Two materials stull used in fluoroscopes today
Zinc Cadmiun Sulfide
Calcium Tungstate
Developed the Fluoroscope in 1898
Thomas Edison
Demonstrated technique or reducing exposure times and enhancing the image by using double emulsion radiography in 1904
Charles Leonard
Demonstrated technique of reducing exposure times by using an intesigying screen in conjunction with glass photographic plates
Michael Pupin
Discoverd X-ray on Nov 8 1895
Wilhem Conrad Roentgen
Discovered a large partially ecacuated glass tube which bears his name
William Crooks
"Crooks Tube"
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