RTBC RADIATION UNITS OF MEASUREMENT
QUESTIONS WITH 100% SOLVED ANSWERS 2025/26.
How does increasing milliampere-seconds (mAs) affect the exposure of the x-
ray beam? Answer - Exposure increases
How does decreased kilovoltage peak (kVp) affect the absorbed dose to the
patient? Answer - Absorbed dose decreases
Assuming that all other factors remain constant, when the distance between
the x-ray source and radiographer increases, the effective dose to the
radiographer will: Answer - Decrease
Which three of the following is a quantity of radiation in tissue? (Select three)
Answer - - Effective dose
- Absorbed dose
- Equivalent dose
Which of the following measures the ionization produced in the air? Answer -
Exposure
Which of the following radiation measurements are used to quantify the risk of
long-term radiation injuries, such as cancer? Answer - Effective dose
, Radiation that escapes the protective housing of the x-ray tube is known as:
Answer - Leakage
Which of the following is considered primary radiation? Answer - Radiation
that exits the window in the tube housing
Effective dose is a measurement that can be used to evaluate the risks of:
Answer - Long-term radiation effects
Radiation workers should try to keep their occupational dose to a minimum.
Which of the following adjustments would decrease the absorbed dose to a
radiation worker? Answer - Increase distance from the source
When measuring the intensity of the primary beam, what dosimeter position
will demonstrate the highest air KERMA? Answer - 80 cm from the x-ray tube
When measuring the quantity of scatter radiation during a fluoroscopy
procedure, what dosimeter position will demonstrate the lowest exposure
rate? Answer - 3 meters from the patient
The primary by-product of x-ray interactions in air is: Answer - Free electrons
What is the process through which x-rays create charged particles such as free
electrons? Answer - Ionization
Exposure is a radiation measurement used to quantify which of the following?
Answer - Absolute number of ionization events in air
Which of the following best describes radiation exposure? Answer - Quantity
of radiation directed at the patient
QUESTIONS WITH 100% SOLVED ANSWERS 2025/26.
How does increasing milliampere-seconds (mAs) affect the exposure of the x-
ray beam? Answer - Exposure increases
How does decreased kilovoltage peak (kVp) affect the absorbed dose to the
patient? Answer - Absorbed dose decreases
Assuming that all other factors remain constant, when the distance between
the x-ray source and radiographer increases, the effective dose to the
radiographer will: Answer - Decrease
Which three of the following is a quantity of radiation in tissue? (Select three)
Answer - - Effective dose
- Absorbed dose
- Equivalent dose
Which of the following measures the ionization produced in the air? Answer -
Exposure
Which of the following radiation measurements are used to quantify the risk of
long-term radiation injuries, such as cancer? Answer - Effective dose
, Radiation that escapes the protective housing of the x-ray tube is known as:
Answer - Leakage
Which of the following is considered primary radiation? Answer - Radiation
that exits the window in the tube housing
Effective dose is a measurement that can be used to evaluate the risks of:
Answer - Long-term radiation effects
Radiation workers should try to keep their occupational dose to a minimum.
Which of the following adjustments would decrease the absorbed dose to a
radiation worker? Answer - Increase distance from the source
When measuring the intensity of the primary beam, what dosimeter position
will demonstrate the highest air KERMA? Answer - 80 cm from the x-ray tube
When measuring the quantity of scatter radiation during a fluoroscopy
procedure, what dosimeter position will demonstrate the lowest exposure
rate? Answer - 3 meters from the patient
The primary by-product of x-ray interactions in air is: Answer - Free electrons
What is the process through which x-rays create charged particles such as free
electrons? Answer - Ionization
Exposure is a radiation measurement used to quantify which of the following?
Answer - Absolute number of ionization events in air
Which of the following best describes radiation exposure? Answer - Quantity
of radiation directed at the patient
