Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

RADIATION PROTECTION > Prelim > Flashcards

Prelim Flashcards

1
Q

concerned with providing occupational radiation protection and minimizing dose to the public

A

health physics

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

a radiation scientist who is concerned with the research, teaching or operational aspects of radiation safety

A

health physicist

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

rationale: the linear non-threshold radiation dose relationship (LNT) for stochastic effects

A

ALARA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

3 cardinal principles

A

time
distance
shielding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

time of exposure should be kept to a minimum

A

minimize time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

radiation dose is ________ related to the duration of exposure

A

radiation dose is DIRECTLY related to the duration of exposure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

it reminds the radiologist that a considerable amount of fluoroscopic time has elapsed

A

5 minutes reset timer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

radiation dose is ________ related to the distance between the source & the patient

A

radiation dose is INVERSELY related to the distance between the source & the patient

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

it states that the intensity of radiation at a location is inversely proportional to the square of its distance from the source of radiation

A

inverse square law

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

it states that one can compensate for a change in the source-to-object distance by changing the mAs by the factor SID squared

A

square law

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

it was used to calculate exposure in radiographic technique

A

square law

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

it greatly reduces the level of radiation exposure

A

shielding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

composition of shielding

A

lead

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

protective apron is composed of

A

0.5 mm Pb

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

it reduces occupational exposure to 25%

A

protective apron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

the thickness of absorber necessary to reduce radiation intensity to half its original value

A

half value layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

the thickness of absorber necessary to reduce radiation intensity to one-tenth its original value

A

tenth value layer (TVL)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

the equivalent whole body dose

A

effective dose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

it must be contained within protective housing

A

protective xray tube housing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

it reduces leakage radiation

A

protective xray tube housing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

leakage radiation must be less than ____ mR/hr at a distance of 1 m from the protective housing

A

leakage radiation must be less than 100 mR/hr at a distance of 1 m from the protective housing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

it must indicate the condition of exposure

A

control panel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

it must positively indicate when the xray tube is energized

A

control panel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

what collimator should be used for special examination?

A

cones and diaphragms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
light-localized, variable-aperture, rectangular ________ should be provided
light-localized, variable-aperture, rectangular COLLIMATORS should be provided
26
the xray beam and the light beam must coincide to within _% of the SID
the xray beam and the light beam must coincide to within 2% of the SID
27
each radiographic tube should be provided with a mechanism
beam alignment
28
its purpose is to ensure proper alignment of the xray beam and the IR
beam alignment
29
All general-purpose diagnostic x-ray beams must have a total filtration (inherent plus added) of at least ____ mm Al when operated above 70 kVp
All general-purpose diagnostic x-ray beams must have a total filtration (inherent plus added) of at least 2.5 mm Al when operated above 70 kVp
30
Radiographic tubes operated between 50 and 70 kVp must have at least ____ mm Al filtration
Radiographic tubes operated between 50 and 70 kVp must have at least 1.5 mm Al filtration
31
At below 50 kVp, a minimum of ____ mm Al total filtration is required
At below 50 kVp, a minimum of 0.5 mm Al total filtration is required
32
For any radiographic technique, the output radiation intensity should be constant form one exposure to another. This is checked by making repeated radiation exposures through the same technique and observing the average variation in radiation intensity.
reproducibility
33
the exposure switch should be at least _ m from x-ray tube during exposure in mobile x-ray imaging system
the exposure switch should be at least 2 m from x-ray tube during exposure in mobile x-ray imaging system
34
the variation in x-ray intensity should not exceed _%
the variation in x-ray intensity should not exceed 5%
35
what does TVL equal to?
3.3 HVL
36
the features of _________ imaging systems that follow are usually the intended primarily to reduce patient radiation dose
the features of FLUOROSCOPIC imaging systems that follow are usually the intended primarily to reduce patient radiation dose
37
the fluoroscopic exposure control should be of the _____ _____ type
the fluoroscopic exposure control should be of the DEAD MAN type
38
SSD must not less than __ cm on stationary fluoroscopes
SSD must not less than 38 cm on stationary fluoroscopes
39
SSD must not less that __ cm on mobile fluoroscopes
SSD must not less that 30 cm on mobile fluoroscopes
40
the fluoroscopic image receptor assembly serves as a _______ _____ _______ and must be 2 mm Pb equivalent
the fluoroscopic image receptor assembly serves as a PRIMARY PROTECTIVE BARRIER and must be 2 mm Pb equivalent
41
____ should be measured when filtration is unknown
HVL
42
total filtration
2.5 mm Al
43
unexposed border should be visible at all heights above the tabletop
automatic collimators
44
it is moved at the end of the table during fluoroscopy
bucky tray
45
it should be positioned between fluoroscopist and patient
protective curtain
46
it produces an audible sound when the fluoroscopic time has exceeded 5 minutes
cumulative timer
47
the intensity of the x-ray beam at the tabletop of a fluoroscopy should not exceed ___ mGy/min (2.1 R/min) for each mA of operation at 80 kVp
2.1 mGy/min
48
3 types of radiation
useful leakage scater
49
lead bonded to sheet rock or wood panelling is used most often as a _______ _______ ______
lead bonded to sheet rock or wood panelling is used most often as a PRIMARY PROTECTIVE BARRIER
50
what can be used instead of lead in primary barrier?
concrete, concrete block or brick
51
it results when the useful beam intercepts any objects causing some x-rays to be scattered
scatter radiation
52
radiation emitted from the x-ray tube housing in all directions other than that of the useful beam
leakage radiation
53
limit of leakage radiation ___ mR/hr at 1 m
100 mR/hr at 1 m
54
it is designed to shield areas from secondary radiation which is less thick than primary radiation
secondary barrier
55
composition of secondary barrier
gypsum board glass lead acrylic
56
radiologic technologists receive most of their occupational radiation exposure during __________
radiologic technologists receive most of their occupational radiation exposure during FLUOROSCOPY
57
The intensity of scattered radiation 1 meter from the patient is approximately ___ % of the intensity of the useful beam at the patient
The intensity of scattered radiation 1 meter from the patient is approximately 0.1 % of the intensity of the useful beam at the patient
58
6 factors that affect barrier thickness
distance occupancy control workload use factor kvp
59
the use of the area that is being protected
occupancy
60
an area occupied primarily by radiology personnel & patients
controlled area
61
an area that can be occupied by anyone
uncontrolled area
62
product of the maximum mA & the number of x-ray examinations performed per week
workload
63
the percentage of time during which the x-ray beam is on & directed toward a particular protective barrier
use factor
64
it is used as a measure of penetrability
kilovolt peak (kVp)
65
8 radiographic features
protective housing control panel collimator positive beam limitation filtration operation shield mobile x-ray imaging system

RADIATION PROTECTION (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions