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)
Page 1/48
,EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER 2024.
- 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
Page 2/48
,EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER 2024.
- 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
Page 3/48
, EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER 2024.
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
Page 4/48
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)
Page 1/48
,EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER 2024.
- 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
Page 2/48
,EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER 2024.
- 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
Page 3/48
, EMILLECT 2024/2025 ACADEMIC YEAR ©2024 EMILLECT. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER 2024.
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
Page 4/48
