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WorksheetsChapter 15 RADBIO
Total questions: 16
Worksheet time: 9mins
A protective curtain, or sliding panel, with a minimum of 0.25-mm lead equivalent, should normally be positioned between the fluoroscopist and the patient to intercept which of the following types of radiation?
Primary radiation
Scattered radiation above the tabletop
Exit or image-formation radiation
Direct radiation
If the peak energy of the x-ray beam is 100 kVp, a protective lead apron must be the equivalent to at least which of the following measures?
0.25-mm thickness of lead
0.5-mm thickness of lead
1.0-mm thickness of lead
1.5-mm thickness of lead
Occupational exposure of the radiographer can be kept as low as reasonably achievable (ALARA) through individual monitoring and other protective measures and the use of protective devices. Therefore, because exposure from radiation-related jobs will not alter the ______________________, radiation workers may receive a larger equivalent dose than members of the general population.
mean glandular dose
genetically significant dose
bone marrow dose
tissue tolerance dose
Scattered radiation to the lens of the eyes of diagnostic imaging personnel can be substantially reduced by the use of protective eyeglasses fitted with optically clear lenses that contain a minimal lead equivalent protection level of
0.001 mm.
0.05 mm.
0.35 mm.
1.50 mm.
The annual effective dose limit for individual members of the general population not occupationally exposed is ___________ for continuous or frequent exposures from artificial sources other than medical irradiation and natural background and ____________ for infrequent annual exposure.
1 mSv; 5 mSv
3 mSv; 7 mSv
5 mSv; 9 mSv
50 mSv; 25 mSv
The maximum weekly permitted equivalent dose for a controlled area must not exceed
1 mSv.
100 mSv.
20 mSv.
2 mSv.
To ensure that the lifetime risk of occupationally exposed persons remains acceptable, an additional recommendation is that the lifetime effective dose in mSv should not exceed
5 times the occupationally exposed person’s age in years.
the occupationally exposed person’s age in years.
10 times the occupationally exposed person’s age in years.
20 times the occupationally exposed person’s age in years.
When a radiologic technologist declares her pregnancy to her employer, which of the following is appropriate?
She is able to continue her employment but is not permitted to perform any radiologic procedures during the remainder of her pregnancy.
The employer terminates her employment until after her child is born.
The employer requires her to take a leave of absence until after the completion of the first trimester of the pregnancy and then return to her normal duties.
She continues to perform her duties without interruption of employment, provided that she has received radiation safety counseling and follows established radiation safety practices.
When doors to radiographic and fluoroscopic rooms are closed during radiation exposures, a substantial degree of protection is provided for persons in areas adjacent to the room door. This is because in most facilities room doors have attenuation for diagnostic energy x-ray equivalent to that provided by _______ mm of lead.
0.4
0.2
0.6
0.8
When the time spent in a higher radiation area is reduced or limited, occupational exposure
is also reduced.
is increased slightly.
remains the same.
is increased considerably.
Which of the following adjustments in technical exposure factors decreases the production of scattered radiation during routine radiographic procedures?
Decrease kVp and increase mAs in compensation
Decrease kVp and decrease mAs
Increase kVp and decrease mAs in compensation
Increase kVp and increase mAs
Which of the following is another term for use factor (U)?
Occupancy factor in controlled and uncontrolled areas
Workload factor
Beam direction factor
Protective barrier thickness consideration factor
Which part(s) of a diagnostic x-ray unit should not be touched while a radiographic exposure is in progress?
Tube housing, collimator, and high-tension cables
Control panel
Exposure switch
Radiographic table
While standing behind the control-booth barrier, a radiographer makes a radiographic exposure. The x-rays scattered from the patient’s body should ____________________.
scatter only once before reaching any area behind the control-booth barrier.
not have enough energy remaining that will reach behind the control-booth barrier.
scatter a minimum of 2 times before reaching any area behind the control-booth barrier.
scatter a minimum of 10 times before reaching any area behind the control-booth barrier.
Who should determine the exact shielding requirements for a particular imaging facility?
Administrator of the facility
Medical physicist
Radiologist
Radiographer
_______________ is essentially the radiation output weighted time that the unit is actually delivering radiation during the week.
Occupancy
Control designation
Use factor
Workload
