A minimum total amount of aluminum filtration (inherent plus added) of 2.5 mm is
required in equipment operated?
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above 70 kVp
-The x-ray tube's glass envelope and oil coolant are considered inherent
(built-in) filtration. Thin sheets of aluminum are added to make a total of at
least 2.5-mm-Al-equivalent filtration in equipment operated above 70 kVp.
The function of the filtration is to remove the low-energy photons that
serve only to contribute to skin dose.
Filtration is added to the x-ray beam to?
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, produce an x-ray beam with higher average energy.
Which of the following terms is correctly used to describe x-ray beam quality?
A. mA
B. HVL
C. Intensity
D. Dose rate
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B. HVL
-Kilovoltage (kV) and the HVL effect a change in both the quantity and the
quality of the primary beam. The principal qualitative factor of the primary
beam is kilovoltage, but an increase in kilovoltage will also increase the
number of photons produced at the target. HVL, defined as the amount of
material necessary to decrease the intensity of the beam to one-half,
therefore changes both beam quality and beam quantity. Milliamperage is
directly proportional to x-ray intensity (i.e., quantity/dose rate) but is
unrelated to the quality of the beam.
Which of the following personnel monitoring devices is commonly used in diagnostic
radiography and considered to be most sensitive and accurate?
A. TLD
B. Film badge
C. OSL dosimeter
D. Pocket dosimeter
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C. OSL dosimeter
,The focal spot-to-table distance, in mobile fluoroscopy, must be?
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a minimum of 30 cm
-Lead and distance are the two most important ways to protect from
radiation exposure. Fluoroscopy can be particularly hazardous because
the SID is so much shorter than in overhead radiography. Therefore, for
patient protection, it has been established that fixed (stationary) equipment
must provide at least 38 cm source to tabletop/skin distance. Mobile
fluoroscopic equipment must provide at least 30 cm source-to-
tabletop/skin distance.
Occupational radiation monitoring is required when it is likely that an individual will
receive more than what fraction of the annual dose limit?
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1/10
Radiation-induced abnormalities to the fetus during the seventh or eighth week of
pregnancy is likely to cause which of the following?
A. Spontaneous abortion
B. Skeletal anomalies
C. Neurologic anomalies
D. Organogenesis
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, C. Neurologic anomalies
The automatic exposure device that is located immediately under the x-ray table is
the?
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ionization chamber
All the following statements regarding mobile radiographic equipment are true
except
A. the exposure cord must permit the operator to stand at least 6 ft from the patient,
x-ray tube, and useful beam
B. exposure switches must be the two-stage type
C. a lead apron should be carried with the unit and worn by the radiographer during
exposure
D. the radiographer must alert individuals in the area before making the exposure
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B. exposure switches must be two-stage type
How many HVLs are required to reduce the intensity of a beam of monoenergetic
photons to less than 15% of its original value?
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required in equipment operated?
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above 70 kVp
-The x-ray tube's glass envelope and oil coolant are considered inherent
(built-in) filtration. Thin sheets of aluminum are added to make a total of at
least 2.5-mm-Al-equivalent filtration in equipment operated above 70 kVp.
The function of the filtration is to remove the low-energy photons that
serve only to contribute to skin dose.
Filtration is added to the x-ray beam to?
Give this one a try later!
, produce an x-ray beam with higher average energy.
Which of the following terms is correctly used to describe x-ray beam quality?
A. mA
B. HVL
C. Intensity
D. Dose rate
Give this one a try later!
B. HVL
-Kilovoltage (kV) and the HVL effect a change in both the quantity and the
quality of the primary beam. The principal qualitative factor of the primary
beam is kilovoltage, but an increase in kilovoltage will also increase the
number of photons produced at the target. HVL, defined as the amount of
material necessary to decrease the intensity of the beam to one-half,
therefore changes both beam quality and beam quantity. Milliamperage is
directly proportional to x-ray intensity (i.e., quantity/dose rate) but is
unrelated to the quality of the beam.
Which of the following personnel monitoring devices is commonly used in diagnostic
radiography and considered to be most sensitive and accurate?
A. TLD
B. Film badge
C. OSL dosimeter
D. Pocket dosimeter
Give this one a try later!
C. OSL dosimeter
,The focal spot-to-table distance, in mobile fluoroscopy, must be?
Give this one a try later!
a minimum of 30 cm
-Lead and distance are the two most important ways to protect from
radiation exposure. Fluoroscopy can be particularly hazardous because
the SID is so much shorter than in overhead radiography. Therefore, for
patient protection, it has been established that fixed (stationary) equipment
must provide at least 38 cm source to tabletop/skin distance. Mobile
fluoroscopic equipment must provide at least 30 cm source-to-
tabletop/skin distance.
Occupational radiation monitoring is required when it is likely that an individual will
receive more than what fraction of the annual dose limit?
Give this one a try later!
1/10
Radiation-induced abnormalities to the fetus during the seventh or eighth week of
pregnancy is likely to cause which of the following?
A. Spontaneous abortion
B. Skeletal anomalies
C. Neurologic anomalies
D. Organogenesis
Give this one a try later!
, C. Neurologic anomalies
The automatic exposure device that is located immediately under the x-ray table is
the?
Give this one a try later!
ionization chamber
All the following statements regarding mobile radiographic equipment are true
except
A. the exposure cord must permit the operator to stand at least 6 ft from the patient,
x-ray tube, and useful beam
B. exposure switches must be the two-stage type
C. a lead apron should be carried with the unit and worn by the radiographer during
exposure
D. the radiographer must alert individuals in the area before making the exposure
Give this one a try later!
B. exposure switches must be two-stage type
How many HVLs are required to reduce the intensity of a beam of monoenergetic
photons to less than 15% of its original value?
Give this one a try later!
