ARRT FINAL EXAM GUIDE 2025
|MOST COMMON QUESTIONS WITH CORRECTLY
VERIFIED ANSWERS|ALREADY A+
GRADED|GUARANTEED PASS
Radiation in air is measured by - Exposure or air kerma
Absorbed dose measures - Tissue radiation
Equivalent dose measures - Effects of radiation in tissue
ESE stands for - Entrance skin exposure
ESE measures - The intensity (quantity) of radiation in the air at the level of the patient's
skin
DAP stands for - Dose Area Product
DAP measures - The total amount of radiation delivered to the patient from diagnostic
imaging equipment
RADIATION IN AIR - RADIATION IN AIR
Exposure = - # of ionizations create in air by x-ray
Within the SI system, exposure in air is measured by - Coulombs per kilogram (C/kg)
Air Kerma measures - Total energy of ionizations in air (intensity)
Air Kerma is quantified by - Gray (Gy)
Air Kerma can be increased by - Increasing kVp, mAs, decreasing distance
Air kerma can be decreased by - Decreasing kVp, mAs, increasing distance
The SI unit used to measure radiation exposure in air is:
A. Gray
,B. Coulomb/kg
C. Sievert
D. Curie - B. Coulomb/kg
The Coulomb/kg is the SI unit used to measure the radiation in the air.
The SI unit for Air Kerma is:
A. Sievert
B. Gray
C. Coulomb/kg
D. Becquerel - B. Gray
The unit of measurement for the Air Kerma is the Gray; however, because it is such a large
measurement, it is more common to see it expressed in milligray (mGy).
The radiation measurement coulomb/kilograms is used to describes:
A. Absorbed dose
B. Ionizations in air
C. Effective dose
D. Skin entrance dose - B. Ionizations in air
Coulomb/kilogram is the SI measurement for ionizations (electric charge) in the air.
Which of the following statements are true regarding exposure and air kerma?
As mAs increases, exposure and Air Kerma increase
As kVp increases, exposure and Air Kerma decrease
,As distance increases, exposure and Air Kerma decrease
A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 1, 2, and 3 - B. 1 and 3
Exposure and air kerma are both representations of the x-ray beam intensity. As mAs increases
so does exposure and air kerma. SID also affects exposure and air kerma due to the effects of
the inverse square law. When SID (distance) increases, the exposure and air kerma decrease.
When kVp is increased, both exposure and air kerma increase (not decrease).
Ionization occurs when x-ray photons separate a(n) ___________ from an atom.
A. Proton
B. Electron
C. Neutron - B. Electron
Ionization happens with the gain or loss of an electron. In terms of diagnostic radiology,
ionization occurs when x-ray photons separate an electron from an atom and create two
charged particles (ions).
The acronym KERMA stand for:
A. Kilograms Energy Release Mass
B. Kilovoltage Energy Release Mass
C. Kinetic Electrons Released Momentum Activity
D. Kinetic Energy Released per unit Mass - D. Kinetic Energy Released per unit Mass
, KERMA stands for Kinetic Energy Released per unit Mass.
Why is it important that medical physicists perform exposure tests annually on x-ray
equipment?
1 - Ensure that patients are not being over-exposed.
2 - Ensure that the x-ray machine is functioning properly.
3 - Ensure that the right amount of radiation is being produced for each exam.
A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 1, 2, and 3 - D. 1, 2, and 3
Medical physicists should perform exposure tests annually to ensure that patients are not being
over exposed, the machine is functioning properly, and the right amount of radiation is being
produced for each exam.
Exposure measures the number of ions created while air kerma measures the total energy of
the ions.
A. True
B. False - A. True
Exposure measures the number of ions created, air KERMA measures the total energy of ions in
air. Both air kerma and exposure are used to measure the intensity of the x-ray beam.
RADIATION IN TISSUE - RADIATION IN TISSUE
The SI unit of measurement for absorbed dose - Gray (Gy)
Radiation EFFECTS in tissue - Equivalent dose (EqD), Effective dose (EfD)
|MOST COMMON QUESTIONS WITH CORRECTLY
VERIFIED ANSWERS|ALREADY A+
GRADED|GUARANTEED PASS
Radiation in air is measured by - Exposure or air kerma
Absorbed dose measures - Tissue radiation
Equivalent dose measures - Effects of radiation in tissue
ESE stands for - Entrance skin exposure
ESE measures - The intensity (quantity) of radiation in the air at the level of the patient's
skin
DAP stands for - Dose Area Product
DAP measures - The total amount of radiation delivered to the patient from diagnostic
imaging equipment
RADIATION IN AIR - RADIATION IN AIR
Exposure = - # of ionizations create in air by x-ray
Within the SI system, exposure in air is measured by - Coulombs per kilogram (C/kg)
Air Kerma measures - Total energy of ionizations in air (intensity)
Air Kerma is quantified by - Gray (Gy)
Air Kerma can be increased by - Increasing kVp, mAs, decreasing distance
Air kerma can be decreased by - Decreasing kVp, mAs, increasing distance
The SI unit used to measure radiation exposure in air is:
A. Gray
,B. Coulomb/kg
C. Sievert
D. Curie - B. Coulomb/kg
The Coulomb/kg is the SI unit used to measure the radiation in the air.
The SI unit for Air Kerma is:
A. Sievert
B. Gray
C. Coulomb/kg
D. Becquerel - B. Gray
The unit of measurement for the Air Kerma is the Gray; however, because it is such a large
measurement, it is more common to see it expressed in milligray (mGy).
The radiation measurement coulomb/kilograms is used to describes:
A. Absorbed dose
B. Ionizations in air
C. Effective dose
D. Skin entrance dose - B. Ionizations in air
Coulomb/kilogram is the SI measurement for ionizations (electric charge) in the air.
Which of the following statements are true regarding exposure and air kerma?
As mAs increases, exposure and Air Kerma increase
As kVp increases, exposure and Air Kerma decrease
,As distance increases, exposure and Air Kerma decrease
A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 1, 2, and 3 - B. 1 and 3
Exposure and air kerma are both representations of the x-ray beam intensity. As mAs increases
so does exposure and air kerma. SID also affects exposure and air kerma due to the effects of
the inverse square law. When SID (distance) increases, the exposure and air kerma decrease.
When kVp is increased, both exposure and air kerma increase (not decrease).
Ionization occurs when x-ray photons separate a(n) ___________ from an atom.
A. Proton
B. Electron
C. Neutron - B. Electron
Ionization happens with the gain or loss of an electron. In terms of diagnostic radiology,
ionization occurs when x-ray photons separate an electron from an atom and create two
charged particles (ions).
The acronym KERMA stand for:
A. Kilograms Energy Release Mass
B. Kilovoltage Energy Release Mass
C. Kinetic Electrons Released Momentum Activity
D. Kinetic Energy Released per unit Mass - D. Kinetic Energy Released per unit Mass
, KERMA stands for Kinetic Energy Released per unit Mass.
Why is it important that medical physicists perform exposure tests annually on x-ray
equipment?
1 - Ensure that patients are not being over-exposed.
2 - Ensure that the x-ray machine is functioning properly.
3 - Ensure that the right amount of radiation is being produced for each exam.
A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 1, 2, and 3 - D. 1, 2, and 3
Medical physicists should perform exposure tests annually to ensure that patients are not being
over exposed, the machine is functioning properly, and the right amount of radiation is being
produced for each exam.
Exposure measures the number of ions created while air kerma measures the total energy of
the ions.
A. True
B. False - A. True
Exposure measures the number of ions created, air KERMA measures the total energy of ions in
air. Both air kerma and exposure are used to measure the intensity of the x-ray beam.
RADIATION IN TISSUE - RADIATION IN TISSUE
The SI unit of measurement for absorbed dose - Gray (Gy)
Radiation EFFECTS in tissue - Equivalent dose (EqD), Effective dose (EfD)
