Ohio GXMO Study Guide Exam 2025
Questions and Answers
When were x-rays discovered? - ANS November 8, 1895 in Germany
What are the 3 Cardinal Principals of radiation protection? - ANS Maximize distance,
maximize shielding, minimize time
What is Erythema? - ANS Reddening of the skin
What is Anemia? - ANS Decrease of oxygen in blood, low blood count
What is Leukopenia? - ANS Low WBC count
What is epilation? - ANS Loss of hair
What is collimation? - ANS Limits the size/area of the x-ray beam
What is a proton? - ANS Positively charged, in nucleus of atom
What is a neutron? - ANS No electrical charge, in nucleus of atom
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,What is a electron? - ANS Negatively charged, in orbital shell around nucleus of an atom
What is an ion? - ANS A charged particle
What is ionization? - ANS Process of an electron leaving its orbit around a neutral atom
What does isotropic mean? - ANS Equal in all directions
What happens when x-rays are absorbed by body tissue? - ANS Causes ionization of atoms
and molecules
What is radioplaque? - ANS DOES NOT go through
What is radiolucent? - ANS Sees through
A special mechanism that stops tube movement at a specific location is? - ANS Detent
What device receives the energy of the x-ray beam and forms the image of the body part? -
ANS Image Receptor
What type of cassette containing film receives x-ray beam? - ANS Film based
What is a latent image? - ANS A hidden image
What type of cassette containing a phosphor plate receives the x-ray beam? - ANS Computed
Radiography
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, In CR, the phosphor plate will be scanned by a? - ANS Laser
What does the collimator do? - ANS Limits the size of the radiation field
What does kVp control? - ANS The penetrating ability of the x-rays
What does mAs control? - ANS The quantity of x-rays produced
What is attenuation? - ANS Absorption of the x-ray beam within the patients body
What material absorbs a high percentage of radiation? - ANS Lead
What is the anode? - ANS Positive charged, contains the target and is heated to produce
thermionic emission of electrons
What is the cathode? - ANS Negative charged, contains the small/large filaments within a
focusing cup
99% of the energy of the electrons striking the target is converted into? - ANS Heat
What rotates during exposure? - ANS Anode
What does the small filament do? - ANS Provides greater image detail
Higher kVp should be used for what type of body parts? - ANS Larger or more dense body
parts
Pg. 3 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
Questions and Answers
When were x-rays discovered? - ANS November 8, 1895 in Germany
What are the 3 Cardinal Principals of radiation protection? - ANS Maximize distance,
maximize shielding, minimize time
What is Erythema? - ANS Reddening of the skin
What is Anemia? - ANS Decrease of oxygen in blood, low blood count
What is Leukopenia? - ANS Low WBC count
What is epilation? - ANS Loss of hair
What is collimation? - ANS Limits the size/area of the x-ray beam
What is a proton? - ANS Positively charged, in nucleus of atom
What is a neutron? - ANS No electrical charge, in nucleus of atom
Pg. 1 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
,What is a electron? - ANS Negatively charged, in orbital shell around nucleus of an atom
What is an ion? - ANS A charged particle
What is ionization? - ANS Process of an electron leaving its orbit around a neutral atom
What does isotropic mean? - ANS Equal in all directions
What happens when x-rays are absorbed by body tissue? - ANS Causes ionization of atoms
and molecules
What is radioplaque? - ANS DOES NOT go through
What is radiolucent? - ANS Sees through
A special mechanism that stops tube movement at a specific location is? - ANS Detent
What device receives the energy of the x-ray beam and forms the image of the body part? -
ANS Image Receptor
What type of cassette containing film receives x-ray beam? - ANS Film based
What is a latent image? - ANS A hidden image
What type of cassette containing a phosphor plate receives the x-ray beam? - ANS Computed
Radiography
Pg. 2 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
, In CR, the phosphor plate will be scanned by a? - ANS Laser
What does the collimator do? - ANS Limits the size of the radiation field
What does kVp control? - ANS The penetrating ability of the x-rays
What does mAs control? - ANS The quantity of x-rays produced
What is attenuation? - ANS Absorption of the x-ray beam within the patients body
What material absorbs a high percentage of radiation? - ANS Lead
What is the anode? - ANS Positive charged, contains the target and is heated to produce
thermionic emission of electrons
What is the cathode? - ANS Negative charged, contains the small/large filaments within a
focusing cup
99% of the energy of the electrons striking the target is converted into? - ANS Heat
What rotates during exposure? - ANS Anode
What does the small filament do? - ANS Provides greater image detail
Higher kVp should be used for what type of body parts? - ANS Larger or more dense body
parts
Pg. 3 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.
