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RADT 1010 Final Exam Study Guide with Verified Solutions

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RADT 1010 Final Exam Study Guide with Verified Solutions Production of xrays require four factors - Answer-source of electrons, target, high-voltage, vacuum what is the envelope made of + the dimensions - Answer-pyrex glass or metal, 10'' long, 6'' central diameter, 2'' peripheral diameter Wh...

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  • October 15, 2024
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Emillect
EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER 2024.




RADT 1010 Final Exam Study Guide
with Verified Solutions

Production of xrays require four factors - Answer✔✔-source of electrons, target, high-voltage,

vacuum


what is the envelope made of + the dimensions - Answer✔✔-pyrex glass or metal, 10'' long, 6''

central diameter, 2'' peripheral diameter


What purpose does protective housing serve? - Answer✔✔-- controls leakage and scatter

radiation


- isolates high voltages


- provides means to cool tube


what controls leakage radiation and scatter radiation - Answer✔✔-- 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 - Answer✔✔-- dielectric oil (insulates,

promotes cooling)


- air fan


what is the cathode made up of - Answer✔✔-- filament(s)


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- focusing cup


- associated wiring


what must the filament do - Answer✔✔-must provide enough resistance to e- flow so that heat

produced will cause thermionic emission (occurs @ 2200 degrees)


filament material and why - Answer✔✔-tungsten because it has high melting point and difficult

to vaporize. Can also be rhenium and molybdenum.


Explain thermionic emission - Answer✔✔-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 - Answer✔✔-- tube arcing (vaporized tungsten collection on envelop)


- filament breakage (often due to boost and hold)


what is the focusing cup made of - Answer✔✔-nickel or molybdenum


does a focusing cup have a high/low, negative/postivite potential - Answer✔✔-low negative


what is the mA for space charge effect - Answer✔✔-maximum mA is 1000-1200


three functions of anode assembly - Answer✔✔-- target surface


- conducts high voltage


- serves as primary thermal conductor


components of rotating anode assembly - Answer✔✔-- anode

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- stator


- rotor


Description of stator - Answer✔✔-located outside envelope, is a bank of electromagnets


description of rotor - Answer✔✔-- 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 - Answer✔✔-- 3200-3600 rpm


- 10000-20000 rpm high speed anodes


what is the rotating anode made of and why - Answer✔✔-tungsten-rhenium alloy, because it

has high atomic number, high melting point, has heat conducting ability


what temperature does the focal track get to - Answer✔✔-reaches 1000-2000 degrees in

normal use


what is the anode backed with and why is it backed - Answer✔✔-molybdenum and/or graphite.

backing assists with heat loading


warmup procedure of anode benefits - Answer✔✔-prevents cracking, helps maintain vacuum,

stress relieved anode




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what is target area and what areas - Answer✔✔-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 - Answer✔✔-large focal spot is better for life

of anode


what size focal spot is required for image quality - Answer✔✔-small focal spot


What is the line focus principle? - Answer✔✔-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.


what is effective focal spot controlled by - Answer✔✔-actual focal spot and target angle


what are the diagnostic ranges - Answer✔✔-10-1200 mA


0.001 to 10 seconds


30-150 kVp


description of xray table - Answer✔✔-uniform, radiolucent surface, easy to clean, no crevices

that could collect contrast media, contains bucky/IR


what are the different tube supports - Answer✔✔-- overhead


- floor


- floor to ceiling

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