ARRT SAFETY FINAL LATEST ANSWERS AND
QUESTIONS SET A+
✔✔A 0.25-mm lead-equivalent apron will attenuate about 97% of a 50-kVp x-ray beam,
66% of a 75-kVp beam, and 51% of a 100-kVp beam. - ✔✔
✔✔A 0.5-mm lead-equivalent apron will attenuate about 99.9% of a 50-kVp beam, 88%
of a 75-kVp beam, and 75% of a 100-kVp beam - ✔✔
✔✔What is the annual dose-equivalent limit for the skin and hands of an occupationally
exposed individual?
30 mSv
150 mSv
500 mSv
650 mSv - ✔✔500 mSv
✔✔Which of the following is most likely to result in the greatest increase in patient
exposure?
Changing from 100 mA to 200 mA
Increasing kV 15% and cutting mAs in half
Decreasing the kV 15% and doubling the mAs
Changing from nongrid technique to 8:1 grid technique - ✔✔changing from nongrid to
8:1 grid
✔✔The National Council on Radiation Protection and Measurements (NCRP) has
recommended what total equivalent dose limit to the embryo/fetus?
0.5 mSv
5.0 mSv
50 mSv
500 mSv - ✔✔5 mSv
✔✔Which of the following body parts is (are) included in whole-body dose?
Gonads
, Blood-forming organs
Extremities - ✔✔all 3 - include all the especially radiosensitive organs. The gonads, the
lens of the eye, and the blood-forming organs are particularly radiosensitive.
✔✔What is the approximate ESE for the average upright PA chest radiograph?
0.10 mGy
1.0 mGy
1.50 mGy
2.75 mGy - ✔✔.10 mGy
✔✔If a quantity of radiation is delivered to a body in a single dose, its effect:
will be greater than if it were delivered in a number of doses over a long period of time.
will be less than if it were delivered a number of doses over a long period of time.
has no relation to how it is delivered in time.
is solely dependent on the radiation quality. - ✔✔will be greater than if it were delivered
in a number of doses over a long period of time:
dependent on several factors: the amount of radiation received, the size of the irradiated
area, and how the radiation is delivered in time.
✔✔radiation that is delivered in portions of a period of time and has a less harmful effect
than if delivered all at once - ✔✔fractioned
✔✔The genetic effects of radiation and some somatic effects, such as leukemia, are
plotted on a linear dose-response curve. The linear dose-response curve has no
threshold; that is, there is no dose below which radiation is absolutely safe. - ✔✔
✔✔What is the term used to describe x-ray photon interaction with matter and the
transference of part of the photon's energy to matter?
Absorption
Scattering
Attenuation
Divergence - ✔✔scattering
✔✔Which of the following radiologic projections would deliver the greatest ESE?
PA Chest
Lateral Skull
AP Pelvis
AP Lumbar spine - ✔✔AP lumbar spine
✔✔Which of the following is an acceptable approximate entrance skin exposure (ESE)
for a PA chest radiograph?
0.1 mGy
0.5 mGy
1.5 mGy
QUESTIONS SET A+
✔✔A 0.25-mm lead-equivalent apron will attenuate about 97% of a 50-kVp x-ray beam,
66% of a 75-kVp beam, and 51% of a 100-kVp beam. - ✔✔
✔✔A 0.5-mm lead-equivalent apron will attenuate about 99.9% of a 50-kVp beam, 88%
of a 75-kVp beam, and 75% of a 100-kVp beam - ✔✔
✔✔What is the annual dose-equivalent limit for the skin and hands of an occupationally
exposed individual?
30 mSv
150 mSv
500 mSv
650 mSv - ✔✔500 mSv
✔✔Which of the following is most likely to result in the greatest increase in patient
exposure?
Changing from 100 mA to 200 mA
Increasing kV 15% and cutting mAs in half
Decreasing the kV 15% and doubling the mAs
Changing from nongrid technique to 8:1 grid technique - ✔✔changing from nongrid to
8:1 grid
✔✔The National Council on Radiation Protection and Measurements (NCRP) has
recommended what total equivalent dose limit to the embryo/fetus?
0.5 mSv
5.0 mSv
50 mSv
500 mSv - ✔✔5 mSv
✔✔Which of the following body parts is (are) included in whole-body dose?
Gonads
, Blood-forming organs
Extremities - ✔✔all 3 - include all the especially radiosensitive organs. The gonads, the
lens of the eye, and the blood-forming organs are particularly radiosensitive.
✔✔What is the approximate ESE for the average upright PA chest radiograph?
0.10 mGy
1.0 mGy
1.50 mGy
2.75 mGy - ✔✔.10 mGy
✔✔If a quantity of radiation is delivered to a body in a single dose, its effect:
will be greater than if it were delivered in a number of doses over a long period of time.
will be less than if it were delivered a number of doses over a long period of time.
has no relation to how it is delivered in time.
is solely dependent on the radiation quality. - ✔✔will be greater than if it were delivered
in a number of doses over a long period of time:
dependent on several factors: the amount of radiation received, the size of the irradiated
area, and how the radiation is delivered in time.
✔✔radiation that is delivered in portions of a period of time and has a less harmful effect
than if delivered all at once - ✔✔fractioned
✔✔The genetic effects of radiation and some somatic effects, such as leukemia, are
plotted on a linear dose-response curve. The linear dose-response curve has no
threshold; that is, there is no dose below which radiation is absolutely safe. - ✔✔
✔✔What is the term used to describe x-ray photon interaction with matter and the
transference of part of the photon's energy to matter?
Absorption
Scattering
Attenuation
Divergence - ✔✔scattering
✔✔Which of the following radiologic projections would deliver the greatest ESE?
PA Chest
Lateral Skull
AP Pelvis
AP Lumbar spine - ✔✔AP lumbar spine
✔✔Which of the following is an acceptable approximate entrance skin exposure (ESE)
for a PA chest radiograph?
0.1 mGy
0.5 mGy
1.5 mGy
