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GXMO Ohio 2026 Exam Questions and Correct Answers (155 Questions) – Radiation Physics, Radiographic Positioning, Image Quality & Protection

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This document contains 155 verified exam questions and correct answers for the GXMO Ohio 2026 examination, covering radiation physics, radiographic terminology, digital imaging systems, radiation protection principles, image production, and operator responsibilities. The material includes core definitions and concepts essential for the General Machine Operator (GXMO) scope of practice, including atomic structure, ionization, attenuation, absorption, Compton scattering, Bremsstrahlung radiation, characteristic radiation, and electromagnetic energy. The guide provides comprehensive coverage of radiographic equipment components such as anode, cathode, filament, focal spot, collimator, grid, flat panel detector, AEC systems, control console, and CR/DR systems. It also explains imaging principles including contrast, density, dynamic range, distortion, magnification, geometric unsharpness, image inversion, edge enhancement, and exposure indicator numbers. Key radiation safety topics include ALARA, dose limits, half-value layer (HVL), inverse square law with formula, cardinal principles of radiation protection (time, distance, shielding), biological damage, early and late somatic effects, genetic effects, acute radiation syndrome, and dose creep. Additionally, the document addresses professional standards and regulatory concepts relevant to Ohio GXMO candidates, including ARRT, ASRT, HIPAA, direct supervision requirements, ethics in radiologic practice, film badges and dosimetry, control badges, and exposure monitoring. It also covers patient positioning terminology (anatomic position, anterior-posterior, lateral, distal, decubitus), digital image processing techniques, and radiation detection devices such as ionization chambers and Geiger-Muller meters. This study resource is particularly suitable for: GXMO (General X-ray Machine Operator) candidates in Ohio Limited Scope Operators (LSO) preparing for state certification Radiologic technology students reviewing foundational physics Medical imaging trainees studying radiation safety and digital imaging Healthcare professionals preparing for radiography-related credentialing exams It serves as a structured, exam-focused glossary and revision guide aligned with Ohio GXMO examination standards and core radiography principles. Keywords: GXMO Ohio exam, limited scope operator Ohio, radiation physics, ionization, attenuation, Compton scattering, Bremsstrahlung radiation, characteristic radiation, ALARA principle, inverse square law, half value layer, dose limit, radiation protection, focal spot, anode cathode, flat panel detector, computed radiography CR, digital radiography DR, automatic exposure control AEC, grid ratio, image contrast, dynamic range, exposure indicator number, biological effects of radiation, ARRT certification, ASRT guidelines, HIPAA compliance

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GXMO Ohio 2026 Exam
Questions and Correct Answers |
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Absorption - 🧠 ANSWER ✔✔When all of the x-ray energy is absorbed by

the ejected electron


acute radiation syndrome - 🧠 ANSWER ✔✔Radiation sickness that occurs

in humans after whole-body doses of 1 Gy (100 rad) or more of ionizing

radiation delivered over a short time not seen in diagnostic imaging

,ALARA - 🧠 ANSWER ✔✔(radiation exposure)As Low As Reasonably

Achievable


Anatomic Position - 🧠 ANSWER ✔✔The position in which the patient is

standing erect; with the face directed forward, arms extended by the sides

with the palms facing forward, and the toes pointing anteriorly


Anatomically Programmed Radiography (APR) - 🧠 ANSWER ✔✔Technique

by which graphics on the console guide the operator in selection of a

desired kVp and mAs


Angiography - 🧠 ANSWER ✔✔The fluoroscopic imaging of blood vessels


Anode - 🧠 ANSWER ✔✔Positively charged side of an x-ray tube that

contains the target


Anterior-Posterior - 🧠 ANSWER ✔✔from front to back


American Registry of Radiologic Technologists (ARRT) - 🧠 ANSWER

✔✔The world's largest credentialing organization in medical imaging,

interventional procedures, and radiation therapy; certify and register

technologists through administration of education, ethics and examination

requirements.

, Artifact - 🧠 ANSWER ✔✔Unintended optical density on a radiograph or

another film-type image receptor

American Society of Radiologic Technologists (ASRT) - 🧠 ANSWER

✔✔Professional organization that promotes research, continuing education

and guidelines for radiography instruction


Atom - 🧠 ANSWER ✔✔Smallest particle of an element that cannot be

divided or broken by chemical means


Atomic Number (Z) - 🧠 ANSWER ✔✔number of protons in the nucleus


Attenuation - 🧠 ANSWER ✔✔absorption of the x-ray beam in matter,

usually the human body


Automatic Exposure Control (AEC) - 🧠 ANSWER ✔✔feature/device that

determines radiation exposure during radiography in most x-ray imaging

systems


Back-up time - 🧠 ANSWER ✔✔when the exposure timer is manually set by

the operator to a time greater than the anticipated exposure time




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