RTBC - radiation protection Exam
Questions With All Correct Answers
The primary purpose of the ALARA principal and diagnostic imaging is to -
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? -
ANSWER✔✔-2.5 mGy
Which cardinal rule of radiation protection is mathematically defined by the inverse
square law - ANSWER✔✔-Distance
In order to reduce a Technologist occupational dose during a portable radiograph of the
chest, the technologist should - 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? - ANSWER✔✔-2 mSv
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 1
, 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? - 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. - ANSWER✔✔-625 microsieverts
Which three of the following properties of lead make it a valuable material for radiation
shielding devices? - 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? - ANSWER✔✔-Lead
How does radiation dose change if a Technologist increases their distance from
radiation source by a factor of 2? - 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? - ANSWER✔✔-X-ray beam intensity
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 2
Questions With All Correct Answers
The primary purpose of the ALARA principal and diagnostic imaging is to -
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? -
ANSWER✔✔-2.5 mGy
Which cardinal rule of radiation protection is mathematically defined by the inverse
square law - ANSWER✔✔-Distance
In order to reduce a Technologist occupational dose during a portable radiograph of the
chest, the technologist should - 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? - ANSWER✔✔-2 mSv
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 1
, 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? - 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. - ANSWER✔✔-625 microsieverts
Which three of the following properties of lead make it a valuable material for radiation
shielding devices? - 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? - ANSWER✔✔-Lead
How does radiation dose change if a Technologist increases their distance from
radiation source by a factor of 2? - 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? - ANSWER✔✔-X-ray beam intensity
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 2
