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Physics > LU06 Physics Quiz > Flashcards

LU06 Physics Quiz Flashcards

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1
Q

main purpose of x-ray tube

A

maintain a vacuum

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2
Q

two types of anodes

A

stationary
rotating

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3
Q

flaw of stationary anodes

A

hot electrons constantly bombarding the same
spot on anode

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4
Q

what is used as the core for rotating anodes

A

molybdenum

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5
Q

what is used on the external surface of our rotating anodes

A

rhenium and tungsten

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6
Q

the motor that turns our anodes works through

A

mutual induction

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7
Q

small anode angles results in

A

the smallest effective focal spot

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8
Q

less intensity comes from what side
anode or cathode

A

anode

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9
Q

what charge does the focusing cup have

A

negative

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10
Q

the oil in the tube serves as

A

electric insulation

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11
Q

another term for electron cloud

A

space charge

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12
Q

tungsten button embedded in a copper rod

A

stationary anode

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13
Q

what has a moly core

A

rotating anode

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14
Q

what is the outside of the rotating anode coated with

A

tungsten and sometimes rhenium

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15
Q

anode is composed of

A

anode target
induction motor

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16
Q

cathode is composed of

A

focusing cup
filament
wires

17
Q

glass envelope is made of

A

borosilicate glass

18
Q

what does a metal envelope provide

A

provides a constant electric potential between the cathode and anode

19
Q

the window is typically

A

5 cm square

20
Q

the window is constructed to

A

minimally absorb x rays

21
Q

made up of electromagnetic that are arranged in pairs around the rotor

A

stator

22
Q

located outside of the tube enclosure

A

stator

23
Q

made up of an iron core

A

rotor

24
Q

located inside the tube enclosure

A

rotor

25
Q

rpm’s for general purpose tubes

A

3,400

26
Q

rpm for specialty tubes

A

10,000

27
Q

when the angle of the anode is less then 45 degrees…

A

the effective focal spot will be smaller than the actual

28
Q

what degree is the most common in general purpose tubes

A

12

29
Q

benefits of LFP

A

better heat dissipation
higher quality images
sharper images

30
Q

focusing cup is connected to

A

secondary circuit

31
Q

what is added to the filaments to increase thermionic emission and extend filament life

A

thorium

32
Q

focusing cup is made up of

A

nickel

33
Q

focusing cup works via

A

electrostatic repulsion

34
Q

three ways heat is dissipated

A

conduction
radiation
convection

35
Q

of best energy from the anode used to determine if a particular set of exposure factors are safe or unsafe for the x ray tube

A

tube rating charts

36
Q

gives the time it takes for a tube to cool down before proceeding with another exposure

A

tube cooling charts

37
Q

what three things are plotted on tube rating charts

A

kvp
exposure time
ma

Physics (1 decks)

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