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Materials Schmearials
Wires and Movement
100
This protects the x-ray tube from physical damage and isolates the tube electrically, protecting the radiographer and patient
What is the protective housing (steel)?
100
Primary purpose of glass or metal enclosure around x-ray tube
What is to maintain a vacuum?
(So electrons from the air do not disturb the x-ray production)
100
In the image below, the letter 'B' identifies this structure made of this material.
What is the molybdenum neck and base of the anode?
100
Material (and Z#) used as part of the rotating anode shaft because of its electrical and thermal properties.
What is Copper (Z#29)?
100
The x-ray tube motor operates on the principle of this type of electrification.
What is electromagnetic mutual induction?
200
Material that lines the tube housing
What is lead?
200
Glass tube enclosures are made of this type of glass because it is very heat resistant
What is borosilicate (Pyrex)?
200
In the image below, letter "J" is this structure and located here.
What are stators (electromagnets) and outside the envelope?
200
Material (and Z#) used as part of the rotating anode disc base and core (neck) because it has a low thermal conductivity and is a light, but strong alloy.
What is Molybdenum (Z#42)?
200
Average anode RPM for general purpose tubes.
What is 3400?
300
The 2 parts of the tube housing that helps protect the tube from thermal damage by dissipating heat
What are cooling fans and an oil bath?
300
The area in the envelope where the primary beam exits.
What is the target window?
(Thinned glass or metal area on the envelope)
300
In the image below, letter "H" is this structure made of this material.
What is the tungsten (Z#74) anode?
300
Melting point of Tungsten (and Z#).
What is 3400 degrees Celsius and Z#74?
300
Purpose of rotating anode design.
What is to dissipate heat?
(heat-load capacity and exposure techniques that can be used increases)
400
The meaning of 'x-rays are produced isotropically'
What is x-rays are produced in all directions?
400
Radiation that is produced at the anode other than the focal spot.
What is off-focus or extrafocal radiation?
400
In the diagram below, the letter "I" is this structure made of this material.
What is the silver coated ceramic tube bearings?
400
Material (and Z#) added to the rotating anode coating material to increase thermal capacity and tensile strength.
What is Rhenium (Z#75)?
400
Sizes of the filaments in the cathode (length and width).
What is 7-15 mm long and 1-2 mm wide?
500
Amount of leakage radiation required by regulation
What is less that 100 mR/hr?
Technically, it is 0.0258 millicoulumbs/kg per hour in SI units ;)
500
Suntanning, that can result in arcing and damage of the tube, is a result of this event
What is deposits of vaporized tungsten that causes a bronzing discoloration?
500
In the diagram below, the letter "A" is this structure made of this material.
What is the iron core of the rotor?
(surrounded by a copper shaft)
500
DOUBLE JEOPARDY
Material (and Z#) that is added to the filament to increase thermionic emission and extend filament life.
500
The filament (focal spot size) only affects recorded detail. The smaller the focal spot, the ________________ the recorded detail in the image.
What is greater?