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Radiologic Sciences > X-ray Tube > Flashcards

X-ray Tube Flashcards

1
Q

Actual focal spot

A

the area of the anode surface which receives the beam of electrons from the cathode.

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2
Q

Anode

A

the component of the x-ray tube where x-rays are produced

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3
Q

Cathode

A

the negatively charged side of x-ray tube circuit

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4
Q

Dual-focus

A

cathode focused to provide two contiguous line-focus focal spots each of 1 millimeter width

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5
Q

anode assembly

A

anode, stator, rotor

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6
Q

what are the two types of anodes?

A

stationary anodes, rotating anodes

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7
Q

why is tungsten the best metal for the x-ray machine?

A
  • high atomic #
  • high melting point
  • heat-conducting ability
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8
Q

what is the metal tungsten’s atomic #?

A

74

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9
Q

what is the same charge effect?

A

as more electrons build up in the area of the filament, negative charges oppose emission of additional charges

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10
Q

what is the line-focus principle

A

it is used to reduce the effective area of the focal point

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11
Q

what is the anode heel effect?

A

the radiation intensity is greater on the cathode side.

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12
Q

what is off-focus radiation

A

it comprises photons that were not produced at the focal point

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13
Q

what conditions must exist for x-rays to be produced?

A
  • source of electrons
  • appropriate target
  • high voltage
  • vaccuum
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14
Q

what is thermionic emission?

A

the emission of electrons from a heated source

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15
Q

what is the function of the focusing cup?

A

narrows the thermonic cloud as its driven toward the anode

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16
Q

what does the cathode assembly consist of

A

filament, focusing cup and wiring

17
Q

where is the stator located?

A

outside of the vacuum of the envelope

18
Q

where is the rotor located?

A

inside the stator and inside the envelope

19
Q

what is the function of the envelope?

A

to maintain the vacuum between the cathode and anode

20
Q

What units are used in Radiography?

A

SI units

21
Q

what is the unit name/symbol for absorbed dose?

A

Gray, Gy

22
Q

what is the unit name/symbol for electric potential?

A

volt, v

23
Q

what is the unit name/symbol for dose equivalent?

A

Sievert, Sv

24
Q

what is the unit name/symbol for exposure?

A

Coulomb/kg, C/kg

25
Q

what is the unit name/symbol for frequency?

A

Hertz, Hz

26
Q

what is the unit name/symbol for magnetic flux density?

A

Tesla, T

27
Q

what is the unit name/symbol for power?

A

Watt, W

28
Q

what is the unit name/symbol for radioactivity?

A

Bequerel, Bq

29
Q

what is the unit name/symbol for energy?

A

Joule, J

30
Q

what does Kv stand for, and how many volts are there in one Kv?

A

power, 10,000

31
Q

what does mA stand for, and how many volts are in one?

A

quantity, 1/1000 ampere

32
Q

what is matter?

A

a mixture of substances

33
Q

what can break molecules?

A

x-rays

34
Q

T/F: electrons can be divided

A

False

Radiologic Sciences (5 decks)

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