©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 8:22PM. A+
GXMO Study Guide 100% Verified And
Updated 2025
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 or more of ionizing radiation delivered over a short time; not seen in
diagnostic imaging
ALARA - Answer✔Principle that states that rad exposure should be 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 section 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
ARRT - American Registry of Radiologic Technologists - Answer✔The world's largest
credentialing organization in medical imaging, interventional procedures, and radiation
therapy; certify and register technologist through administration of education, ethics and
examination requirements
Artifact - Answer✔Unintended optical density on a radiograph or another film-type image
receptor
ASRT - American Society of Radiologic Tecnologists - Answer✔Professional organization that
promotes research, continuing education and the guidelines for radiography instructions
Atom - Answer✔Smallest particle of an element that cannot be divided or broken by chemical
means
1|Page
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 8:22PM. A+
Atomic Number (z) - Answer✔Number of protons in a nucleus
Attenuation - Answer✔Absorption of the x-ray beam in matter, usually the human body
Automatic exposure control (AEC) - Answer✔Feature 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
that is greater than the anticipated exposure time
Bergonie-Tribondeau Law - Answer✔Principle that states that the radio sensitivity of cells is
directly proportional to the reproductive activity and inversely proportional to their degree of
differentiation
Binding Energy - Answer✔The energy required to separate a single particle or group of particles
from a molecule, atom or nucleus
Biological Damage - Answer✔The damage produced from exposure to radiation
Bremsstrahlung x-ray - Answer✔X-ray that results from interaction of the projectile electron
with a target nucleus; also know as breaking radiation
Bucky Tray - Answer✔A device that contains a moving grid
Caliper - Answer✔A tool for a body part measurement
Cardinal principles of radiation protection - Answer✔The methods used to protect operators
from unnecessary radiation exposure; time, distance and shielding
Cassette - Answer✔A rigid holder that contains the film and screens
Cathode - Answer✔Negative side of the x-ray tube; contains the filament and the focusing cup
Central ray - Answer✔Center of the primary x-ray beam that interacts with the image receptor
Characteristic radiation - Answer✔One of two types of x-ray productions. It is created when an
electron enters the tungsten anode of the x-ray tube and knocks out a K-shell electron. This
interaction produces and x-ray photon.
Coherent scattering - Answer✔Scattering of x-rays with no loss of energy; also called classical
scattering
Collimation - Answer✔Restriction of the useful x-ray beam to reduce pt dose and improve
image contrast
Collimator - Answer✔A boxlike device attached under the tube housing which allows the x-ray
operator to vary the beam size and shape
Compensating filter - Answer✔Material inserted between an x-ray source and a pt to shape the
intensity of the x-ray beam
2|Page
GXMO Study Guide 100% Verified And
Updated 2025
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 or more of ionizing radiation delivered over a short time; not seen in
diagnostic imaging
ALARA - Answer✔Principle that states that rad exposure should be 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 section 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
ARRT - American Registry of Radiologic Technologists - Answer✔The world's largest
credentialing organization in medical imaging, interventional procedures, and radiation
therapy; certify and register technologist through administration of education, ethics and
examination requirements
Artifact - Answer✔Unintended optical density on a radiograph or another film-type image
receptor
ASRT - American Society of Radiologic Tecnologists - Answer✔Professional organization that
promotes research, continuing education and the guidelines for radiography instructions
Atom - Answer✔Smallest particle of an element that cannot be divided or broken by chemical
means
1|Page
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 8:22PM. A+
Atomic Number (z) - Answer✔Number of protons in a nucleus
Attenuation - Answer✔Absorption of the x-ray beam in matter, usually the human body
Automatic exposure control (AEC) - Answer✔Feature 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
that is greater than the anticipated exposure time
Bergonie-Tribondeau Law - Answer✔Principle that states that the radio sensitivity of cells is
directly proportional to the reproductive activity and inversely proportional to their degree of
differentiation
Binding Energy - Answer✔The energy required to separate a single particle or group of particles
from a molecule, atom or nucleus
Biological Damage - Answer✔The damage produced from exposure to radiation
Bremsstrahlung x-ray - Answer✔X-ray that results from interaction of the projectile electron
with a target nucleus; also know as breaking radiation
Bucky Tray - Answer✔A device that contains a moving grid
Caliper - Answer✔A tool for a body part measurement
Cardinal principles of radiation protection - Answer✔The methods used to protect operators
from unnecessary radiation exposure; time, distance and shielding
Cassette - Answer✔A rigid holder that contains the film and screens
Cathode - Answer✔Negative side of the x-ray tube; contains the filament and the focusing cup
Central ray - Answer✔Center of the primary x-ray beam that interacts with the image receptor
Characteristic radiation - Answer✔One of two types of x-ray productions. It is created when an
electron enters the tungsten anode of the x-ray tube and knocks out a K-shell electron. This
interaction produces and x-ray photon.
Coherent scattering - Answer✔Scattering of x-rays with no loss of energy; also called classical
scattering
Collimation - Answer✔Restriction of the useful x-ray beam to reduce pt dose and improve
image contrast
Collimator - Answer✔A boxlike device attached under the tube housing which allows the x-ray
operator to vary the beam size and shape
Compensating filter - Answer✔Material inserted between an x-ray source and a pt to shape the
intensity of the x-ray beam
2|Page
