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Worksheetsbushong Chapter 6- Xray tube
Total questions: 73
Worksheet time: 50mins
give the two of the three main methods of xray support
*use and*
(a)
most frequent used. has two perpendicular sets of ceiling mounted rail.
(a)
tube that maintains electron potential
(a)
single columns with rollers at the end. one is attached to ceiling mounted rail and other is attached to floor mounted rail
(a)
use in interventional radiology. c shaped
(a)
in the right side of the xray tube in is a negative side
(a)
when xray are produced they are emitted ISOTROPICALLY means?
(a)
when the xray is emitted through the window
(a)
how much protective housing reduces in leakage radiation
(a)
when the xray escaped in protective housing
(a)
serves as both of __________ against electric shock and ____________ to dissipate heat
*use and*
(a)
the glass enclosure is made of?
(a)
glass or metal enclosure is a special type of vacuum that contains 2 electrodes:
*use and*
(a)
size of glass or metal enclosure
(a)
xray tube is generally designed with (a)
when little gas is in enclosure, the electron flow in cathod and anode is ____, and ____ xray are produced, then _____ heat are generated
(a)
early xray tube that is not a vacuum type
(a)
modern xray tube and a vacuum type
(a)
Area of glass or metal enclosure
(a)
two primary parts of cathode
use and
(a)
Coil of wire
cathode
anode
focusing cup
filament
size of a filament
2mm in diameter; 1 or 2cm long
30-50cm long; 20cm in diameter
5cm^2
3mm in diameter; 1-3cm long
It emits xray when heated
(a)
when the current thriugh the filament is high, the outher shell electrons "boiled off" and ejected electron from filament is a process that called?
thermionic cushion
thermionic
thermionic emission
thermionic extension
filaments are usually made of
pyrex glass
thoriated tungsten
thermionic tungsten
tungsten
the melting point of tungsten
*use (a) *C to answer*
result of loss of xray function
tube arcing
tube arching
tube aching
tube
filament is embedded through metal shroud called
(a)
the xray tube current is adjusted by controlling _______
filament current
focusing cup
fillament emission
electropotential
In low filament current, what will happen to tube current?
high tube current
low tube current
no tube current
small tube current
3 effectiveness of focusing cup
Size and Space
Charge
Position of filament in focusing cup
size and shape
Space Charge is also called as?
Clouds
Cloud of cathode
cloud of electron
cloud of anode
focal spot that is used in spatial resolution
Small focal spot
large focal spot
Big focal spot
Little focal spot
What is the range of small focal spot
0.1 to 1mm
0.3 to 2mm
What is the range of Large focal spot
0.1 to 1mm
0.3 to 2mm
Two types of Anode
Stationary and Circling
Stationary
Stationary and Rotating
Circling
Used in dental xray imaging systems, and portable imaging system that doesnt use high tube current and power
Stationary Anode
Station Anode
Anode
Rotating anode
Capable of Producing high intensity xray beam in shortest time
Stationary Anode
Station Anode
Rotate Anode
Rotating Anode
Conducts electricity and radiates heat and xray from target
ANODE
CATHODE
Anode Serves three functions in an xray tube
Electrical Conductor
Thermal Dissipator
Serves as Target
Serves as Copper
Stationary Anode tube target consist of?
Tungsten Alloy
Rotating disk
Stationary Disk
Tungsten
Rotating Anode tube the entire _____ is the target
Rotating Anode
Rotating Disk
Stationary Anode
Stationary disk
Tungsten is the target for general radiography for 3 main reasons:
Atomic Number
thermal conductivity
high melting point
position of tungsten
Atomic Number of Tungsten
73
74
75
76
(high) Melting point of tungsten
3410*C
3500*C
3510*C
Target area of Stationary Anode
5mm^2
2mm^2
4mm^2
3mm^2
Target area of Rotating Anode
1500mm^2
1600mm^2
1700mm^2
1800mm^2
Most rotating anode revolves around how many revolution per minute?
3500 bpm
3400 bpm
3500 rpm
3400 rpm
melting point of copper
1000*C
1100*C
K X-ray Energy (keV) OF tungsten
69 keV
65 keV
Atomic number of Molybdenum (Mo)
46
42
K X-ray Energy (keV) OF Molybdenum (Mo)
19 keV
20 kev
melting point of Molybdenum (Mo)
2600*C
3100*C
Rhodium (Rh) Atomic Number
43
45
K X-ray Energy (keV) OF Rhodium (Rh)
23 keV
24 keV
Melting point of Rhodium(Rh)
2600*C
3200*C
Stem is made up of ________ Because it is a poor heat conductor
Copper
Tungsten
Molybdenum
Rotor is made up of
Copper
Tungsten
Molybdenum
Used to turn the anode
Induction Motor
insulator motor
conductor motor
Two principal parts of induction motor
Stator and Motor
Stator and Rotor
Rotor and Induction
Consists of series of electromagnets equally spaced around the neck of the tube
Stator
ROTOR
Inside the glass or metal enclosure is a shaft made of bars of copper and soft iron fabricated into one mass
stator
rotor
In a new xray tube the coast time is approximately, How many seconds?
5s
65s
60s
As the size of the focal spot ______, the heating of the target is concentrated onto smaller area
Decreases
Increases
Diagnostic x-ray tubes have target angles that vary from approximately ____-___ degrees
5-20 degrees
5-10 degrees
The smaller anode angle, the larger the heel effect
TRUE
FALSE
This results in reduced x-ray intensity on the anode side of the useful beam caused by absorption in the "heel" of the target
Heel effect
Anode Effect
The heel effect results in ____ effective focal spot and less radiation intensity on the anode side of the beam
Smaller
larger
Heat can be dissipated in one of three ways:
radiation
induction
conduction
convection
Transfer of heat by the emission of infrared radiation. Heat lamps not only emit visible light but also infrared radiation
Radiation
Conduction
Convection
Transfer of energy from one area of an object to another. The handle of a heated iron Skillet becomes hot because of _______?
Radiation
conduction
convection
Transfer of heat by the movement of a heated substance from one place to another. Many homes and offices are heated by the ________ of hot air
Radiation
Conduction
Convection
The principal parts of a rotating anode x-ray tube
IDENTIFY NO. 1
(a)
