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Rad Phys > Final: practice questions > Flashcards

Final: practice questions Flashcards

1
Q

unprocessed rare earth film has usually what color

A

purple

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2
Q

how should unexposed x-ray film be stored

A

with the box on end

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3
Q

what is the recommended intensifying screen for use in a chiropractic office

A

rare earth

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4
Q

what contains silver halide crystals

A

film emulsion

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5
Q

how will dirt on the intensifying screen appear on the exposed film

A

white specks

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6
Q

what problem could occur if your intensifying screen is warped

A

a blurry area from bad contact

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7
Q

why should bad films that you have retaken not be destroyed

A

they can be sold for silver

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8
Q

with gradient screens, what would be true

A

the lumbar section has the fastest speed

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9
Q

what part of an automatic processor is responsible for removing excess fluid as the film exits a tank

A

squeegee rollers

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10
Q

silver is usually recovered from what fluid

A

fixer

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11
Q

small white specks on the processed film usually indicate what

A

dirty intensifying screen

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12
Q

how would your processed film appear if your developer temperature was above normal and it was developed at the normal time

A

it would be too light

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13
Q

what is usually considered the optimal developing time for manual processing

A

5 minutes

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14
Q

a film taken with a 1200 screen speed system will usually demonstrate what appearance

A

the film will be grainy

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15
Q

what color safelight filter is needed for most rare earth screens

A

red

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16
Q

how long is a doctor required to keep the records of radiation exposure on a worker in his/her office

A

for the lifetime of the individual

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17
Q

where would an oil density normally be found on an xray

A

outlining some muscles and organs

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18
Q

the contrast of natural metal density and water density explains why we often see what

A

an arteriosclerotic aorta

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19
Q

what releases to a dosimeter

A

a film badge

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20
Q

if you saw the support back or hinges imaged on a film. what would be the most common reason

A

you put the cassette in backwards

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21
Q

what US governmental agency mandates the removal of silver from a processing fluid before disposal

A

EPA

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22
Q

in inches, what is the lead equivalent thickness required for a ceiling of a single story building

A

none

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23
Q

what is true about occupational dose limits

A

the should not exceed 5 rems per year for the whole body

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24
Q

pull out old xrays-> yellow-brown-> what was done incorrectly

A

the films were not washed long enough

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25
Q

17 year old wants to take xrays for you-> what does he have to do

A

wait until the next summer when he is 18

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26
Q

what is a quantum mottle

A

a prominent graininess to the film

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27
Q

kink marks (crescent marks) occur from what

A

bending or crimping the film

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28
Q

when is a latent image present

A

after exposing the film but before processing it

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29
Q

generally, what would make the phosphor layer of the screen faster

A

thicker composition

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30
Q

what types of films will create the radiographic image with greatest detail

A

single emulsion

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31
Q

what color is recommended for your darkroom walls

A

black

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32
Q

a 1200 screen speed system will usually demonstrate what appearance

A

the film will be grainy

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33
Q

what is the name for the usual test for film screen contact

A

wire mesh test

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34
Q

with gradient screens, what would be true

A

the lumbar section has the fastest speed

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35
Q

silver is usually recovered from what fluid

A

fixer

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36
Q

what should be considered if you are manually processing 30 14x17” films per week

A

get an automatic processor

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37
Q

what is the usual recommended optimal developing temperature for manual processing

A

68 degrees

38
Q

densitometry and densitometry are primarily used for what purpose

A

to monitor processor function

39
Q

in what step of manual processing does a “kissing” artifact occur

A

developing

40
Q

how could you best see the L5-S1 disc space and sacrum on an AP film

A

use a cephalic tube tilt

41
Q

what relates to a dosimeter

A

a film badge

42
Q

what should you check when constructing an xray facility to make sure you are up to code with lead lining

A

your local state requirements

43
Q

in inches, a secondary barrier needs to have how much lead equivalency

A

1/32

44
Q

what is true about occupational dose limits

A

it should not exceed 5 rems per year for the whole body

45
Q

all photos look fogged-> dryer temp is 102 degrees, film box is purple, safe light filter is amber, box is standing on end-> likely cause

A

his processor dryer temperature is too hot

46
Q

in order to justify an automatic processor, 20-25 14x17” films should be run through in what time period

A

per week

47
Q

if your temperature is too high in the dryer part of your automatic processor, what would be the most likely

A

the films will probably have water spots

48
Q

with manual processing after a film is first put into a solution, what is the next recommended thing to do

A

agitate it

49
Q

if you have 2 films of a patient that demonstrates a kissing artifact, why do ou suspect it could be necessary to retake the films

A

because kissing artifacts can be mistaken for pathologies

50
Q

if your developer smells like ammonia, what does it usually mean

A

it is oxidized

51
Q

where would you place the wire mesh for a wire mesh test

A

on the cassette

52
Q

what is not one of the criteria for holding a patient

A

only employees should hold the patient

53
Q

what is the occupational annual dose limit for whole body exposure

A

5 rem

54
Q

let’s say you have installed an automatic processor in your dark room. since it is a big processor, you actually want it to be out of your small darkroom. what part of the processor must be in the darkroom

A

the feed tray

55
Q

1/16th inch lead is equivalent to how many inches of concrete

A

four

56
Q

which combination of screen light and film color is preferred

A

green light and purple film

57
Q

how will dirt on the intensifying screen appear on the exposed film

A

white specks

58
Q

what would lead to the least exposure of a patient to ionizing radiation

A

a dual screen system

59
Q

what effects will too fast of a film screen combination have on the radiograph

A

it will demonstrate a graininess

60
Q

what speed if preferred in general spinal radiography with 3 rare earth system

A

400

61
Q

having a thicker phosphor layer in your screens will have what effect

A

make the screen faster

62
Q

what is the wire mess test for

A

if there is good contact between the screens and film

63
Q

why should bad films that you have retaken not be destroyed

A

they can be sold for silver

64
Q

about how many 14x17” films should be run through an automatic processor in a week before it is economically feasible

A

20-25

65
Q

densitometry is a way to do what

A

to check consistency of processing

66
Q

when using the four basic densities of xray interpretation, what is the second least dense

A

oil

67
Q

in inches, what is the lead equivalent thickness required for a ceiling of a single story building

A

none

68
Q

full spine series-> fat, big belly-> sectionals-> what are you going to do to get a good film

A

a dual screen cassette with a grid

69
Q

black branching streaks randomly placed on the film is usually due to what

A

static electricity

70
Q

what type of film is preferred in a chiro office

A

double emulsion

71
Q

what advantage does a single screen cassette have

A

increased image detail

72
Q

which speed is preferred in general spinal radiography with a rare earth system

A

400

73
Q

an arbitrary number of 100 speed screens is referred to as

A

par

74
Q

“rare earth” screens have what effect

A

less radiation dose to the patient

75
Q

what would produce the most grain (noise) on a film

A

using fast speed screens

76
Q

with intensifying screens, what would give better detail

A

a single screen system

77
Q

which color light is preferred from the intensifying screen crystals today

A

blue-green

78
Q

a 100 speed rare earth dual screen system are often used for what

A

wrist

79
Q

in order to justify an automatic processor, 20-25 14x17” films should be run through in what time period

A

per week

80
Q

if your temperature is too high in the dryer part of your automatic processor, what would be the most likely

A

them films will probably have water spots

81
Q

what would oxidized developer look like

A

brown

82
Q

what is true about manual processing

A

fixing is twice as long as developing

83
Q

with processing equipment, which tan contains an acidic solution

A

fixing tank

84
Q

four inches of concrete is equivalent to how much lead

A

1/16th of an inch

85
Q

a primary barrier needs to be how thick when using lead

A

1/16th of an inch

86
Q

in inches, what is the lead equivalent thickness required for a ceiling of a single story building

A

none

87
Q

what has been the established DL for occupational exposure of the extremities

A

50 rads/year

88
Q

how long is a doctor required to keep the records of radiation exposure on a worker in his/her office

A

for the lifetime of the individual

89
Q

what is the occupational annual dose limit for whole body exposure

A

5 rem

90
Q

what is true about holding a patient for xray procedures

A

the holder should wear a lead apron

91
Q

ID printer-> put it where it belongs-> where would be the best location for the printer

A

the work bench in the dark room

92
Q

monthly maintenance-> what should be done

A

pull out all of the transport racks and clean with a brush

Rad Phys (2 decks)

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