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CORE Huda > 1 x-rays > Flashcards

1 x-rays Flashcards

1
Q

eV

A

kinetic E gained

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2
Q

J

A

E unit

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3
Q

voltage

A

causes e- to move

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4
Q

power

A

rate of E use (J/sec)

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5
Q

Z

A

atomic # (# of protons)

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6
Q

A

A

mass # (protons + neutrons)

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7
Q

electromagnetic radiation

A

oscillating electric & magnetic fields

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8
Q

frequency (f)

A

cycles/sec (Hz)

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9
Q

velocity (v)

A

f x wavelength

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10
Q

photon energy is proportional to ___.

A

frequency

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11
Q

gamma rays

A

high E e- from nuclear process

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12
Q

transformer

A

increases voltage by orders of magnitude

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13
Q

typical transformer ratings (kV, mA, kW)

A

100kV, 100 kW, 1000 mA

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14
Q

rectifier

A

changes current from alternating to direct (AC -> DC)

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15
Q

mA

A

tube current flowing through the x-ray tube

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16
Q

brems. xrays

A

energetic e- made when e- interact with nuclear electric fields

17
Q

relationship btwn focal spot & blurring?

A

small fs –> decreased blurring

18
Q

relationship btwn focal spot & exposure time?

A

large fs –> decreased exposure time bc tolerates more power loading

19
Q

how to change kV & target Z to increase brems xray production?

A

increase accelerating kV increase Z of target

20
Q

what are the 3 fates of xrays

A

1/3 scatter 2/3 absorption <1% transmitted/penetration

21
Q

define the 2 types of scatter

A
  1. Compton: most e-, photons transfers E to a Compton e- 2. Coherent: low E e- is scattered from an atom without any E loss; <5% of scatter.
22
Q

Molybdenum keV & Z

A

20 keV Z=42

23
Q

Tungsten keV & Z

A

70 keV Z=74

CORE Huda (4 decks)

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