OHIO GXMO STUDY GUIDE REVIEW EXAM
2026 UPDATED | COMPLETE QUESTIONS &
CORRECT ANSWERS | VERIFIED EXAM PREP
FOR ASSURED SUCCESS
• OHIO GXMO STUDY GUIDE REVIEW EXAM 2026 UPDATED — This material is a
comprehensive, verified exam prep resource featuring 200 carefully curated
multiple-choice questions with correct answers and EXPERT RATIONALE designed
to maximize your exam success.
• How to use this guide: Read each question carefully, attempt an answer before
viewing the correct option, and study the EXPERT RATIONALE thoroughly — this
deepens understanding beyond memorization and prepares you for real exam
scenarios.
OHIO GXMO STUDY GUIDE REVIEW EXAM 2026
200 QUESTIONS | COMPLETE WITH ANSWERS & EXPERT RATIONALE
Q1. What does the abbreviation GXMO stand for in Ohio?
A. General X-ray Machine Operator
B. General X-ray Medical Officer
C. Government X-ray Management Organization
D. General X-ray Monitoring Official
E. Graduate X-ray Machine Operator
✓ Correct Answer: A. General X-ray Machine Operator EXPERT RATIONALE:
GXMO stands for General X-ray Machine Operator, which is the Ohio-specific limited
licensure designation for individuals authorized to perform general radiographic
procedures under physician supervision.
Q2. Which Ohio regulatory body oversees the licensure of General X-ray
Machine Operators?
, A. Ohio Board of Pharmacy
B. Ohio State Medical Board
C. Ohio Department of Health
D. Ohio Board of Nursing
E. Ohio Department of Labor
✓ Correct Answer: C. Ohio Department of Health EXPERT RATIONALE: The Ohio
Department of Health (ODH) is the regulatory authority responsible for the licensure and
oversight of General X-ray Machine Operators in the state of Ohio.
Q3. What is the primary source of X-rays in a diagnostic X-ray tube?
A. The anode
B. The cathode filament
C. The focusing cup
D. The glass envelope
E. The rotor
✓ Correct Answer: B. The cathode filament EXPERT RATIONALE: The cathode
filament, when heated by electrical current (thermionic emission), produces the electrons
that are accelerated toward the anode. When these electrons strike the anode target, X-
rays are produced.
Q4. The process by which electrons are released from a heated filament is
called:
A. Ionization
B. Photoelectric effect
C. Thermionic emission
D. Compton scattering
, E. Pair production
✓ Correct Answer: C. Thermionic emission EXPERT RATIONALE: Thermionic
emission is the release of electrons from a heated metal surface. In an X-ray tube, the
filament is heated to a high temperature, causing electrons to be emitted and forming
the electron cloud (space charge) used to produce X-rays.
Q5. Which type of X-ray interaction with matter is most responsible for
patient dose in diagnostic radiography?
A. Coherent scattering
B. Pair production
C. Photodisintegration
D. Photoelectric effect
E. Compton scattering
✓ Correct Answer: D. Photoelectric effect EXPERT RATIONALE: The photoelectric
effect involves complete absorption of an X-ray photon by an inner-shell electron,
resulting in total energy transfer to the patient's tissue. This interaction is primarily
responsible for patient dose and also contributes to radiographic contrast.
Q6. Which type of radiation interaction is responsible for the majority of
scatter radiation in diagnostic radiography?
A. Photoelectric effect
B. Pair production
C. Compton scattering
D. Coherent scattering
E. Photodisintegration
✓ Correct Answer: C. Compton scattering EXPERT RATIONALE: Compton scattering
occurs when an X-ray photon interacts with an outer-shell electron, ejecting it and
, producing a scattered photon at a different direction. This scatter degrades image
quality and contributes to occupational radiation exposure.
Q7. What is the unit of absorbed dose in the SI system?
A. Roentgen (R)
B. Rem
C. Curie (Ci)
D. Gray (Gy)
E. Becquerel (Bq)
✓ Correct Answer: D. Gray (Gy) EXPERT RATIONALE: The Gray (Gy) is the SI unit of
absorbed dose, equal to 1 joule of energy absorbed per kilogram of tissue (1 Gy = 100
rad). It measures the energy deposited in tissue by ionizing radiation.
Q8. What is the SI unit of effective dose (radiation equivalent dose)?
A. Gray (Gy)
B. Sievert (Sv)
C. Becquerel (Bq)
D. Roentgen (R)
E. Coulomb per kilogram (C/kg)
✓ Correct Answer: B. Sievert (Sv) EXPERT RATIONALE: The Sievert (Sv) is the SI unit
of effective dose (equivalent dose), accounting for both the absorbed dose and the
biological effectiveness of different types of radiation. It replaces the traditional unit rem
(1 Sv = 100 rem).
Q9. The annual whole-body occupational dose limit for radiation workers in
the United States is:
2026 UPDATED | COMPLETE QUESTIONS &
CORRECT ANSWERS | VERIFIED EXAM PREP
FOR ASSURED SUCCESS
• OHIO GXMO STUDY GUIDE REVIEW EXAM 2026 UPDATED — This material is a
comprehensive, verified exam prep resource featuring 200 carefully curated
multiple-choice questions with correct answers and EXPERT RATIONALE designed
to maximize your exam success.
• How to use this guide: Read each question carefully, attempt an answer before
viewing the correct option, and study the EXPERT RATIONALE thoroughly — this
deepens understanding beyond memorization and prepares you for real exam
scenarios.
OHIO GXMO STUDY GUIDE REVIEW EXAM 2026
200 QUESTIONS | COMPLETE WITH ANSWERS & EXPERT RATIONALE
Q1. What does the abbreviation GXMO stand for in Ohio?
A. General X-ray Machine Operator
B. General X-ray Medical Officer
C. Government X-ray Management Organization
D. General X-ray Monitoring Official
E. Graduate X-ray Machine Operator
✓ Correct Answer: A. General X-ray Machine Operator EXPERT RATIONALE:
GXMO stands for General X-ray Machine Operator, which is the Ohio-specific limited
licensure designation for individuals authorized to perform general radiographic
procedures under physician supervision.
Q2. Which Ohio regulatory body oversees the licensure of General X-ray
Machine Operators?
, A. Ohio Board of Pharmacy
B. Ohio State Medical Board
C. Ohio Department of Health
D. Ohio Board of Nursing
E. Ohio Department of Labor
✓ Correct Answer: C. Ohio Department of Health EXPERT RATIONALE: The Ohio
Department of Health (ODH) is the regulatory authority responsible for the licensure and
oversight of General X-ray Machine Operators in the state of Ohio.
Q3. What is the primary source of X-rays in a diagnostic X-ray tube?
A. The anode
B. The cathode filament
C. The focusing cup
D. The glass envelope
E. The rotor
✓ Correct Answer: B. The cathode filament EXPERT RATIONALE: The cathode
filament, when heated by electrical current (thermionic emission), produces the electrons
that are accelerated toward the anode. When these electrons strike the anode target, X-
rays are produced.
Q4. The process by which electrons are released from a heated filament is
called:
A. Ionization
B. Photoelectric effect
C. Thermionic emission
D. Compton scattering
, E. Pair production
✓ Correct Answer: C. Thermionic emission EXPERT RATIONALE: Thermionic
emission is the release of electrons from a heated metal surface. In an X-ray tube, the
filament is heated to a high temperature, causing electrons to be emitted and forming
the electron cloud (space charge) used to produce X-rays.
Q5. Which type of X-ray interaction with matter is most responsible for
patient dose in diagnostic radiography?
A. Coherent scattering
B. Pair production
C. Photodisintegration
D. Photoelectric effect
E. Compton scattering
✓ Correct Answer: D. Photoelectric effect EXPERT RATIONALE: The photoelectric
effect involves complete absorption of an X-ray photon by an inner-shell electron,
resulting in total energy transfer to the patient's tissue. This interaction is primarily
responsible for patient dose and also contributes to radiographic contrast.
Q6. Which type of radiation interaction is responsible for the majority of
scatter radiation in diagnostic radiography?
A. Photoelectric effect
B. Pair production
C. Compton scattering
D. Coherent scattering
E. Photodisintegration
✓ Correct Answer: C. Compton scattering EXPERT RATIONALE: Compton scattering
occurs when an X-ray photon interacts with an outer-shell electron, ejecting it and
, producing a scattered photon at a different direction. This scatter degrades image
quality and contributes to occupational radiation exposure.
Q7. What is the unit of absorbed dose in the SI system?
A. Roentgen (R)
B. Rem
C. Curie (Ci)
D. Gray (Gy)
E. Becquerel (Bq)
✓ Correct Answer: D. Gray (Gy) EXPERT RATIONALE: The Gray (Gy) is the SI unit of
absorbed dose, equal to 1 joule of energy absorbed per kilogram of tissue (1 Gy = 100
rad). It measures the energy deposited in tissue by ionizing radiation.
Q8. What is the SI unit of effective dose (radiation equivalent dose)?
A. Gray (Gy)
B. Sievert (Sv)
C. Becquerel (Bq)
D. Roentgen (R)
E. Coulomb per kilogram (C/kg)
✓ Correct Answer: B. Sievert (Sv) EXPERT RATIONALE: The Sievert (Sv) is the SI unit
of effective dose (equivalent dose), accounting for both the absorbed dose and the
biological effectiveness of different types of radiation. It replaces the traditional unit rem
(1 Sv = 100 rem).
Q9. The annual whole-body occupational dose limit for radiation workers in
the United States is:
