RTBC RADIATION PROTECTION 2025 EXAM
QUESTIONS AND CORRECT ANSWERS | GRADE A+
Which cardinal rule of radiation protection is mathematically defined by the
inverse square law - ans -Distance
In order to reduce a Technologist occupational dose during a portable radiograph
of the chest, the technologist should - ans -Stand several feet away from the
patient during the exposure
During a surgical procedure, using three minutes of fluoroscopy time, a
radiographer receives an effective dose of 1 mSv. What effective those would be
experienced by the radiographer, if the fluoroscopy time is doubled? - ans -2 mSv
A radiographer is exposed to a dose rate of 10 mSv per hour, while standing 3 feet
from the patient during see arm procedures. What is the approximate dose rate if
the radiographer stands for feet from the patient? - ans -5.6 mSv/hr
A radiologist receives an equivalent dose of 100 microsieverts while standing 25
cm from a patient during a fluoroscopy procedure. Estimate the equivalent dose if
the radiologist and 10 cm from the patient. - ans -625 microsieverts
The primary purpose of the ALARA principal and diagnostic imaging is to - ans -
Reduce radiation does to occupational workers
A radiation worker receive the radiation dose of 5 mGy while participating in a
fluoroscopy procedure for 10 minutes. What radiation dose would have been
received by the worker if they reduce their time in the radiation field to only five
minute? - ans -2.5 mGy
What lead thickness equivalence is required for protective glasses? - ans -0.35
mm lead (Pb)
What lead thickness equivalence is required for protective lead gloves? - ans -0.25
mm lead (Pb)
, What lead thickness equivalence is required for the Bucky slot cover every
fluoroscopy system - ans -0.25 mm lead (Pb)
What term describes the process of restricting the size of the exposure field to
the area being imaged? - ans -Collimating
The collimated boundaries of the exposure field should always be equal in size to
the - ans -Anatomy of interest
Which two of the following are advantages of using correct collimation? - ans --
decreased patient dose
- Increased image quality
Collimator leaves must be constructed of Haley attenuating materials such as -
ans -Lead
What time describes the expansion of the x-ray beam as it travels through space -
ans -Divergent
Positive beam limitation is a safety feature that ensures the size of the x-ray field
is no larger than the - ans -Detector dimensions
What term describes the component of the x-ray assembly that is manipulated by
the operator to precisely defined the size of the x-ray field? - ans -Adjustable
collimation
Which of the following describes the primary benefit of collimating the exposure
field size to only the required anatomy? - ans -A decrease in the patient's effective
dose
Correct collimation can increase image quality due to a decrease in - ans -Scatter
radiation
Which of the following images represents the ideal collimation for imaging the
lumbar spine? - ans -B
QUESTIONS AND CORRECT ANSWERS | GRADE A+
Which cardinal rule of radiation protection is mathematically defined by the
inverse square law - ans -Distance
In order to reduce a Technologist occupational dose during a portable radiograph
of the chest, the technologist should - ans -Stand several feet away from the
patient during the exposure
During a surgical procedure, using three minutes of fluoroscopy time, a
radiographer receives an effective dose of 1 mSv. What effective those would be
experienced by the radiographer, if the fluoroscopy time is doubled? - ans -2 mSv
A radiographer is exposed to a dose rate of 10 mSv per hour, while standing 3 feet
from the patient during see arm procedures. What is the approximate dose rate if
the radiographer stands for feet from the patient? - ans -5.6 mSv/hr
A radiologist receives an equivalent dose of 100 microsieverts while standing 25
cm from a patient during a fluoroscopy procedure. Estimate the equivalent dose if
the radiologist and 10 cm from the patient. - ans -625 microsieverts
The primary purpose of the ALARA principal and diagnostic imaging is to - ans -
Reduce radiation does to occupational workers
A radiation worker receive the radiation dose of 5 mGy while participating in a
fluoroscopy procedure for 10 minutes. What radiation dose would have been
received by the worker if they reduce their time in the radiation field to only five
minute? - ans -2.5 mGy
What lead thickness equivalence is required for protective glasses? - ans -0.35
mm lead (Pb)
What lead thickness equivalence is required for protective lead gloves? - ans -0.25
mm lead (Pb)
, What lead thickness equivalence is required for the Bucky slot cover every
fluoroscopy system - ans -0.25 mm lead (Pb)
What term describes the process of restricting the size of the exposure field to
the area being imaged? - ans -Collimating
The collimated boundaries of the exposure field should always be equal in size to
the - ans -Anatomy of interest
Which two of the following are advantages of using correct collimation? - ans --
decreased patient dose
- Increased image quality
Collimator leaves must be constructed of Haley attenuating materials such as -
ans -Lead
What time describes the expansion of the x-ray beam as it travels through space -
ans -Divergent
Positive beam limitation is a safety feature that ensures the size of the x-ray field
is no larger than the - ans -Detector dimensions
What term describes the component of the x-ray assembly that is manipulated by
the operator to precisely defined the size of the x-ray field? - ans -Adjustable
collimation
Which of the following describes the primary benefit of collimating the exposure
field size to only the required anatomy? - ans -A decrease in the patient's effective
dose
Correct collimation can increase image quality due to a decrease in - ans -Scatter
radiation
Which of the following images represents the ideal collimation for imaging the
lumbar spine? - ans -B
