RAD 112 - RADIATION PROTECTION QUESTIONS
A controlled area is required to reduce the exposure rate to occupational personnel to
2 mSv/wk (200 mrem/wk)
10 mSv/wk (1,000 mrem/wk)
20 mSv/wk (2,000 mrem/wk)
1 mSv/wk (100 mrem/wk) - Answers :1 mSv/wk (100 mrem/wk)
A cumulative timing device runs during the x-ray exposure and sounds an audible alarm
or temporarily interrupts the exposure after the fluoroscope has been activated for
2 minutes
10 minutes
5 minutes
30 seconds - Answers :5 minutes
A protective apron should be assigned to all portable x-ray units.
TRUE or FALSE - Answers :TRUE
According to the inverse square law, if a technologist doubles the distance from the
radiation source, the dose will
decrease by ½
increase two times
decrease by 1/4
increase four times - Answers :decrease by 1/4
All of the following will provide radiation protection for the radiographer except the
primary barrier
Bucky slot cover
fluoroscopic Pb curtain
film badge dosimeter - Answers :film badge dosimeter
Compared to the primary beam, scatter radiation is
100 times more intense
1,000 times less intense
100 times less intense
1,000 times more intense - Answers :1,000 times less intense
During fluoroscopic procedures, which of the following would be the best place for the
radiologic technologist to stand in order to minimize his or her exposure?
, facing away from the x-ray table and image intensifier
as far away as practical from the x-ray table
as close as possible to the x-ray table
at the patient's head - Answers :as far away as practical from the x-ray table
If the mAs used for an x-ray exposure changed from 20 mAs to 40 mAs, the patient
dose will
remain unchanged
decrease 2 times
increase only if kVp is increased also
increase 2 times - Answers :increase 2 times
*mAs and patient dose are directly proportional
If the peak energy of the x-ray beam is 140 kVp the primary protective barrier should
consist of _________ and extend _________ upward from the floor of the x-ray room
when the tube is 5 to 7 feet from the wall in question.
1/16 inch lead, 10 feet
1/16 inch lead, 7 feet
1/32 inch lead, 7 feet
1/32 inch lead, 10 feet - Answers :1/16 inch lead, 7 feet
If the x-ray tube peak energy can reach 100 kVp, lead aprons must have a minimum
thickness of
0.5 mm Pb
2.5 mm Al
0.5 mm Al
0.25 mm Pb - Answers :0.5 mm Pb
Lead aprons and other protective apparel should be inspected for cracks by
using fluoroscopy
a dosimeter
visual inspection
using a scintillation detector - Answers :using fluoroscopy
Lead aprons and other protective apparel should be inspected for hidden cracks at least
monthly
daily
annually
weekly - Answers :annually
A controlled area is required to reduce the exposure rate to occupational personnel to
2 mSv/wk (200 mrem/wk)
10 mSv/wk (1,000 mrem/wk)
20 mSv/wk (2,000 mrem/wk)
1 mSv/wk (100 mrem/wk) - Answers :1 mSv/wk (100 mrem/wk)
A cumulative timing device runs during the x-ray exposure and sounds an audible alarm
or temporarily interrupts the exposure after the fluoroscope has been activated for
2 minutes
10 minutes
5 minutes
30 seconds - Answers :5 minutes
A protective apron should be assigned to all portable x-ray units.
TRUE or FALSE - Answers :TRUE
According to the inverse square law, if a technologist doubles the distance from the
radiation source, the dose will
decrease by ½
increase two times
decrease by 1/4
increase four times - Answers :decrease by 1/4
All of the following will provide radiation protection for the radiographer except the
primary barrier
Bucky slot cover
fluoroscopic Pb curtain
film badge dosimeter - Answers :film badge dosimeter
Compared to the primary beam, scatter radiation is
100 times more intense
1,000 times less intense
100 times less intense
1,000 times more intense - Answers :1,000 times less intense
During fluoroscopic procedures, which of the following would be the best place for the
radiologic technologist to stand in order to minimize his or her exposure?
, facing away from the x-ray table and image intensifier
as far away as practical from the x-ray table
as close as possible to the x-ray table
at the patient's head - Answers :as far away as practical from the x-ray table
If the mAs used for an x-ray exposure changed from 20 mAs to 40 mAs, the patient
dose will
remain unchanged
decrease 2 times
increase only if kVp is increased also
increase 2 times - Answers :increase 2 times
*mAs and patient dose are directly proportional
If the peak energy of the x-ray beam is 140 kVp the primary protective barrier should
consist of _________ and extend _________ upward from the floor of the x-ray room
when the tube is 5 to 7 feet from the wall in question.
1/16 inch lead, 10 feet
1/16 inch lead, 7 feet
1/32 inch lead, 7 feet
1/32 inch lead, 10 feet - Answers :1/16 inch lead, 7 feet
If the x-ray tube peak energy can reach 100 kVp, lead aprons must have a minimum
thickness of
0.5 mm Pb
2.5 mm Al
0.5 mm Al
0.25 mm Pb - Answers :0.5 mm Pb
Lead aprons and other protective apparel should be inspected for cracks by
using fluoroscopy
a dosimeter
visual inspection
using a scintillation detector - Answers :using fluoroscopy
Lead aprons and other protective apparel should be inspected for hidden cracks at least
monthly
daily
annually
weekly - Answers :annually
