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RADT 1010 Final Exam Questions and Correct Answers the Latest Update
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RADT 1010 Final Exam Questions
and Correct Answers the Latest
Update
Production of xrays require four factors
✓ source of electrons, target, high-voltage, vacuum
what is the envelope made of + the dimensions
✓ pyrex glass or metal, 10'' long, 6'' central diameter, 2'' peripheral diameter
What purpose does protective housing serve?
✓ - controls leakage and scatter radiation
✓ - isolates high voltages
✓ - provides means to cool tube
what controls leakage radiation and scatter radiation
✓ - housing made of lead-lined cast steel
✓ - leakage radiation limit (100 milliroentgens per hour at 1 meter)
what controls high-voltage isolation and tube cooling
✓ - dielectric oil (insulates, promotes cooling)
✓ - air fan
what is the cathode made up of
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✓ - filament(s)
✓ - focusing cup
✓ - associated wiring
what must the filament do
✓ must provide enough resistance to e- flow so that heat produced will cause
thermionic emission (occurs @ 2200 degrees)
filament material and why
✓ tungsten because it has high melting point and difficult to vaporize. Can also be
rhenium and molybdenum.
Explain thermionic emission
✓ occurs when filament heated at 2200 degrees, causes electrons to be released from
filament. when high voltage released at exposure, e- are driven toward anode
what causes tube failure
✓ - tube arcing (vaporized tungsten collection on envelop)
✓ - filament breakage (often due to boost and hold)
what is the focusing cup made of
✓ nickel or molybdenum
does a focusing cup have a high/low, negative/postivite potential
✓ low negative
what is the mA for space charge effect
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✓ maximum mA is 1000-1200
three functions of anode assembly
✓ - target surface
✓ - conducts high voltage
✓ - serves as primary thermal conductor
components of rotating anode assembly
✓ - anode
✓ - stator
✓ - rotor
Description of stator
✓ located outside envelope, is a bank of electromagnets
description of rotor
✓ - is a copper cylinder connected to an anode disk by a molybdenum stem.
✓ - It turns when the stator is energized.
✓ - contains ball bearings.
at what speed does the rotor turn at
✓ - 3200-3600 rpm
✓ - 10000-20000 rpm high speed anodes
what is the rotating anode made of and why
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✓ tungsten-rhenium alloy, because it has high atomic number, high melting point, has
heat conducting ability
what temperature does the focal track get to
✓ reaches 1000-2000 degrees in normal use
what is the anode backed with and why is it backed
✓ molybdenum and/or graphite. backing assists with heat loading
warmup procedure of anode benefits
✓ prevents cracking, helps maintain vacuum, stress relieved anode
what is target area and what areas
✓ portion of anode that electron stream contacts, point source of xray photons
✓ - target, focus, focal point, focal spot, focal track
is a large or small focal spot better for life of anode
✓ large focal spot is better for life of anode
what size focal spot is required for image quality
✓ small focal spot
What is the line focus principle?
✓ by using a small anode angle you can change the size of the effective focal spot (make
it smaller for better resolution) without increasing the heat and damaging the anode.
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