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000 Radiation Safety > Radiation protection COPY COPY > Flashcards

Radiation protection COPY COPY Flashcards

1
Q 
What is used to account for the differences in tissue sensitivity to ionizing radiation when determining effective dose E?
1. Tissue weighting factors
2. Radiation weighting factors
3. Absorbed dose
A.1
B. 1&2
C. 2 &3
D. 1,2, & 3
A

A.1

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2
Q

Guidelines for the use of protective shielding state that gonadal shielding should be used
1. if the patient has reasonable reproductive
potential
2. when the gonads are within 5 cm of the collimated field
3. when tight collimation is not possible
A. 1
B. 1 &2
C. 1 &3
D. 2 &3

A

B. 1 &2

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3
Q 
Occupational radiation monitoring is required when it is possible that he individual might receive more than 
A. 5 mrem
B. 10 mrem
C. one-tenth the annual dose limit
D. one-fourth the annual dose limit
A

C. one-tenth the annual dose limit

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4
Q 
With milliamperes (mA) increased to maintain output intensity, how is the ESE affected as the source - to skin distance is increased?
A. ESE increases
B. ESE decreases
C. ESE remains the same
D. ESE is unrelated
A

A. ESE increases

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5
Q 
Each time an x-ray beam scatters, its intensity at 1 m from the scattering object is what fraction of its original intensity?
A. 1/10
B. 1/100
C. 1/500
D. 1/1000
A

D. 1/1000

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6
Q 
According to the NRCP, the annual occupational whole body dose equivalent limit is
A. 1mSv
B. 50 mSV
C. 150 mSv
D. 500 mSv
A

B. 50 mSV

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7
Q 
A themoluminescent dosimetry system would use which of the following crystals?
A. Silver halide
B. Sodium thiosulfate
C. Lithium fluroide
D. Aluminum oxide
A

C. Lithium fluroide

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8
Q 
All the following  have an effect on patient dose except 
A. kv
B. milliampere seconds
C. focal spot size
D. inherent filtration
A

C. focal spot size

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9
Q 
The photoelectric effect is more likely to occur with
1. absorbers having high Z #
2. high energy incident photons
3. positive contrast media
A. 1 &2
B. 1 & 3
C. 2 & 3
D. 1,2, & 3
A

B. 1 & 3

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10
Q

Which of the following is recommended for the pregnant radiographer?
A. change dosimeters weekly
B. Wear second dosimeter under the lead apron
C. Wear two dosimeters and switch their positions appropriately
D. The pregnant radiographer must leave radiation areas for the duration of the pregnancy

A

B. Wear second dosimeter under the lead apron

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11
Q 
What is the minimum leas requirement for lead aprons, according to NRCP?
A. 0.05 mm PB
B. 0.50 mm PB
C. 0.25 mm PB
D. 1.0 mm PB
A

B. 0.50 mm PB

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12
Q 
An optically stimulated luminescence dosimeter contains which of the following detectors?
A. Gadolinium
B. Aluminum oxide
C. Lithium fluoride
D. Photographic film
A

B. Aluminum oxide

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13
Q 
What is the term used to describe x-ray photon interaction with matter and the transfer  of part of the photon's energy to matter?
A. Absorption
B. Scatter
C. Attenuation
D. Divergence
A

B. Scatter

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14
Q 
The annual dose limit for occupationally exposed individuals is valid for 
A. aplha, beta, and x-radiations
B. x- and gamma radiations only
C. beta, x- and gamma radiations
D. all ionizing radiations
A

C. beta, x- and gamma radiations

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15
Q 
Patient dose increases as flurcopic 
A. FOV increases
B. FOV decreases
C. FSS increases
D. FSS decreases
A

B. FOV decreases

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16
Q 
Biologic material is lest radiosentive to irradiation under which of the following condition?
A. Anoxic
B. Hypoxic
C. Oxygenated
D. Deoxygenated
A

A. Anoxic

17
Q 
For exposure to 1 rad of each of the following ionizing radiations, which would result in the greatest dose to the individual?
A. external source of 1 Mev x-rays
B. external source of diagnostic x-rays
C. internal source of alpha particles
D. external source of beta particle
A

C. internal source of alpha particles

18
Q 
Which type of dose response relationship represents radiation induced leukemia and genetic effects?
A. Linear, threshold
B. Nonlinear, threshold
C. Linear nonthreshold
D. Nonlinear, nonthreshold
A

C. Linear nonthreshold

19
Q 
Which of the following most effectively minimizes radiation exposure to the patient?
A. small focal spot
B. low ratio grids
C. increased SID
D. high speed intensifying screens
A

D. high speed intensifying screens

000 Radiation Safety (71 decks)

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