RTBC Radiation Protection UPDATED
Exam Questions and CORRECT Answers
The primary purpose of the ALARA principal and diagnostic imaging is to - CORRECT
ANSWER - 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? - CORRECT ANSWER - 2.5
mGy
Which cardinal rule of radiation protection is mathematically defined by the inverse square law -
CORRECT ANSWER - Distance
In order to reduce a Technologist occupational dose during a portable radiograph of the chest, the
technologist should - CORRECT ANSWER - 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? - CORRECT ANSWER - 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? - CORRECT ANSWER - 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. - CORRECT ANSWER - 625 microsieverts
Which three of the following properties of lead make it a valuable material for radiation
shielding devices? - CORRECT ANSWER - - High atomic number
, - High mass density
- High attenuation
Which of the following materials requires the smallest half value layer (HVL) to effectively
attenuate the x-ray beam? - CORRECT ANSWER - Lead
How does radiation dose change if a Technologist increases their distance from radiation source
by a factor of 2? - CORRECT ANSWER - Dose decreases by a factor of two squared
A half value layer (HVL) is the thickness of material required to reduce which of the following
by half? - CORRECT ANSWER - X-ray beam intensity
Is shielding device constructed with a sickness equivalent to 1 HVL will reduce the quantity of
radiation to - CORRECT ANSWER - 50% of the original quantity
Is shielding device constructed with a sickness equivalent to two have value layers will reduce
the quantity of radiation to - CORRECT ANSWER - 25% of the original quantity
If they have value layer of shielding material is equal to 2mm, how much radiation will transmit
through 6 mm of this material? - CORRECT ANSWER - 12.5% of the original quantity
What is the most commonly used shielding material in medical imaging? - CORRECT
ANSWER - Lead
What led thickness equivalence is required for protective lead aprons designated for general
radiography, surgery, and fluoroscopy? - CORRECT ANSWER - 0.50 mm lead (Pb)
Do use of leaded glasses is recommended for occupational use in medical imaging in order to
prevent which of the following conditions - CORRECT ANSWER - Radiation induced
cataracts
Exam Questions and CORRECT Answers
The primary purpose of the ALARA principal and diagnostic imaging is to - CORRECT
ANSWER - 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? - CORRECT ANSWER - 2.5
mGy
Which cardinal rule of radiation protection is mathematically defined by the inverse square law -
CORRECT ANSWER - Distance
In order to reduce a Technologist occupational dose during a portable radiograph of the chest, the
technologist should - CORRECT ANSWER - 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? - CORRECT ANSWER - 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? - CORRECT ANSWER - 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. - CORRECT ANSWER - 625 microsieverts
Which three of the following properties of lead make it a valuable material for radiation
shielding devices? - CORRECT ANSWER - - High atomic number
, - High mass density
- High attenuation
Which of the following materials requires the smallest half value layer (HVL) to effectively
attenuate the x-ray beam? - CORRECT ANSWER - Lead
How does radiation dose change if a Technologist increases their distance from radiation source
by a factor of 2? - CORRECT ANSWER - Dose decreases by a factor of two squared
A half value layer (HVL) is the thickness of material required to reduce which of the following
by half? - CORRECT ANSWER - X-ray beam intensity
Is shielding device constructed with a sickness equivalent to 1 HVL will reduce the quantity of
radiation to - CORRECT ANSWER - 50% of the original quantity
Is shielding device constructed with a sickness equivalent to two have value layers will reduce
the quantity of radiation to - CORRECT ANSWER - 25% of the original quantity
If they have value layer of shielding material is equal to 2mm, how much radiation will transmit
through 6 mm of this material? - CORRECT ANSWER - 12.5% of the original quantity
What is the most commonly used shielding material in medical imaging? - CORRECT
ANSWER - Lead
What led thickness equivalence is required for protective lead aprons designated for general
radiography, surgery, and fluoroscopy? - CORRECT ANSWER - 0.50 mm lead (Pb)
Do use of leaded glasses is recommended for occupational use in medical imaging in order to
prevent which of the following conditions - CORRECT ANSWER - Radiation induced
cataracts
