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Registry > Radiation protection > Flashcards

Radiation protection Flashcards

1
Q

how does scatter affect contrast

A

decrease

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2
Q
  • increases photoelectric affect
A

kvp

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3
Q

source of free electrons

A

heated filament

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4
Q

thermionic emission

A

electrons boiling off of heated filament

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5
Q

acceleration of electrons

A

positive anode, negative cathode kvp= push

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6
Q

deceleration of electrons

A

hitting anode (kinetic energy to xray)

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7
Q

Bremmstrahlung

A

electron passes close to the nucleus

nucleus positive makes electrons brake

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8
Q

Most common target interaction

A

bremmstrahlung

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9
Q
  • makes beam hereto
A

bremmstrahlung

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10
Q

Characteristic

A

electron gets hit, kicked oput

another electron falls in inner shell

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11
Q

what affects the quantity of Xrays

A

ma
time
kvp
filtration

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12
Q

what affects quality

A

kvp

flitration

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13
Q

compton effect aka

A

modified/incoherent

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14
Q

compton

A

xray hits an outer electron, some energy absorbed

slightly lower xray goes in diff direction

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15
Q

compton usually happens with

A

high kvp

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16
Q

most common scatter

A

compton

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17
Q

photoelectric

A

xray hits and knocks out electron

electrons fall down to fill hole

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18
Q

most of patient dose happens b/c of

A

photoelectric

19
Q
  • produces contrast
A

photoelectric

20
Q

photoelectric formula

A

Incoming energy= binding energy + kinetic energy of ejected

21
Q

coherent scatter aka

A

unmodified / elastic / rayleigh / classical

22
Q

coherent

A

xray hit electron, both vobrate

the electron goes in diff direction

23
Q

coherent is -% of scatter

A

3

24
Q

coherent doesnt happen with kvp lower than

A

70

25
Q

differential absorption

A

ratio of absorption of one tissue to another

26
Q

partial absorption

A

how much gets sucked up due to tissue density

27
Q
  • is basis for contrast
A

partial absorption

28
Q

thinner part = - attenuation = darker/lighter

A

less darker

29
Q

increase tech for - tissue increase

A

4-5 in

30
Q

effective dose

A

absorbed dose x rad weighting factor x tissue type

SV

31
Q

dose equivalent

A

absorbed dose x rad weighting factor
harm based on rad type
sv

32
Q

absorbed dose

A

energy absorbed

gray

33
Q

air kerma

A

the energy of ionization in air

gray

34
Q

exposure

A

number of ionizations in the air

columb/kg

35
Q

linear nonthershold

A

no level safe

response prop to rad

36
Q

stotastic dose response

A

linear nonthershold

37
Q

linear thershold

A

low rad= no respose until threshold hit

prop to rad

38
Q

ARS does response

A

linear thershold

39
Q

nonlinear thershold

A

low rad= no respose until threshold hit

not prop to rad

40
Q

nonlinear nonthershold

A

no level can be safe

the response happens at every dose not prop to dose

41
Q

LET

A

energy deposited per distance traveled

42
Q

low LET = - energy = - damage

A

high, low

43
Q

RBE

A

compares rad vs standard

Registry (21 decks)

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