RTBC Radiation Units of Measurement
Exam Questions and Answers6
How does increasing milliampere-seconds (mAs) affect the exposure of the x-ray beam? -
ANSWERS-Exposure increases
How does decreased kilovoltage peak (kVp) affect the absorbed dose to the patient? -
ANSWERS-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: - ANSWERS-Decrease
Which three of the following is a quantity of radiation in tissue? (Select three) - ANSWERS--
Effective dose
- Absorbed dose
- Equivalent dose
Which of the following measures the ionization produced in the air? - ANSWERS-Exposure
Which of the following radiation measurements are used to quantify the risk of long-term
radiation injuries, such as cancer? - ANSWERS-Effective dose
Radiation that escapes the protective housing of the x-ray tube is known as: - ANSWERS-
Leakage
, Which of the following is considered primary radiation? - ANSWERS-Radiation that exits the
window in the tube housing
Effective dose is a measurement that can be used to evaluate the risks of: - ANSWERS-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? - ANSWERS-
Increase distance from the source
When measuring the intensity of the primary beam, what dosimeter position will demonstrate
the highest air KERMA? - ANSWERS-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? - ANSWERS-3 meters from the
patient
The primary by-product of x-ray interactions in air is: - ANSWERS-Free electrons
What is the process through which x-rays create charged particles such as free electrons? -
ANSWERS-Ionization
Exposure is a radiation measurement used to quantify which of the following? - ANSWERS-
Absolute number of ionization events in air
Which of the following best describes radiation exposure? - ANSWERS-Quantity of radiation
directed at the patient
Air KERMA is a radiation measurement that describes the: - ANSWERS-Kinetic energy absorbed
by ions in air
Exam Questions and Answers6
How does increasing milliampere-seconds (mAs) affect the exposure of the x-ray beam? -
ANSWERS-Exposure increases
How does decreased kilovoltage peak (kVp) affect the absorbed dose to the patient? -
ANSWERS-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: - ANSWERS-Decrease
Which three of the following is a quantity of radiation in tissue? (Select three) - ANSWERS--
Effective dose
- Absorbed dose
- Equivalent dose
Which of the following measures the ionization produced in the air? - ANSWERS-Exposure
Which of the following radiation measurements are used to quantify the risk of long-term
radiation injuries, such as cancer? - ANSWERS-Effective dose
Radiation that escapes the protective housing of the x-ray tube is known as: - ANSWERS-
Leakage
, Which of the following is considered primary radiation? - ANSWERS-Radiation that exits the
window in the tube housing
Effective dose is a measurement that can be used to evaluate the risks of: - ANSWERS-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? - ANSWERS-
Increase distance from the source
When measuring the intensity of the primary beam, what dosimeter position will demonstrate
the highest air KERMA? - ANSWERS-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? - ANSWERS-3 meters from the
patient
The primary by-product of x-ray interactions in air is: - ANSWERS-Free electrons
What is the process through which x-rays create charged particles such as free electrons? -
ANSWERS-Ionization
Exposure is a radiation measurement used to quantify which of the following? - ANSWERS-
Absolute number of ionization events in air
Which of the following best describes radiation exposure? - ANSWERS-Quantity of radiation
directed at the patient
Air KERMA is a radiation measurement that describes the: - ANSWERS-Kinetic energy absorbed
by ions in air
