Dental Radiology NBDHE 2025/2026
Exam Questions and Correct Answers |
1
New Update
Radiation History - 🧠 ANSWER ✔✔Wilhelm Roentgen discovered the x-ray
in 1895
He discovered x-rays while experimenting with a cathode ray tube
Who discovered the x-ray? - 🧠 ANSWER ✔✔Wilhelm Roentgen
How did ___ discover the x-ray? - 🧠 ANSWER ✔✔Wilhelm Roentgen;
discovered it while experimenting with a cathode ray tube
Ionization - 🧠 ANSWER ✔✔The production of ions
Ions - 🧠 ANSWER ✔✔An atom that gains or loses an electron and
becomes electrically unbalanced
Ion pair - 🧠 ANSWER ✔✔Results when an electron is removed from an
atom in the ionization process;
- atom becomes the positive ion
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,- the ejected electron becomes the negative ion
Ionizing Radiation - 🧠 ANSWER ✔✔Radiation that is capable of producing
2
ions by removing or adding an electron to an atom; x-rays produce
ionization
Particulate Radiation - 🧠 ANSWER ✔✔Tiny particles of matter that possess
mass and travel in straight lines at high speeds;
- electrons, beta particles, cathode rays, protons, alpha particles and
neutrons
Electromagnetic Radiation - 🧠 ANSWER ✔✔The propagation of wave-like
energy (without mass, without particles) through space or matter;
- cosmic rays, x-rays*, microwaves, radio waves, gamma rays, ultraviolet
rays, visible light
Velocity - 🧠 ANSWER ✔✔Speed of a wave
Wavelength - 🧠 ANSWER ✔✔Distance between the crest of one wave to
the crest of the next wave
Frequency - 🧠 ANSWER ✔✔The number of wavelengths that pass a point
in a certain amount of time
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,X-Ray - 🧠 ANSWER ✔✔Electromagnetic ionizing radiation of VERY
SHORT WAVELENGTH resulting from the bombardment of tungsten by
3
highly accelerated electrons in a vaccuum
Properties of X-Radiation - 🧠 ANSWER ✔✔Wave form; travel in waves with
short wavelengths and high frequency
Travel at a speed of light
Have the power to penetrate substances
Invisible
No mass, no weight and no charge
Absorbed by matter
Exert an effect on living tissue; x-rays are able to stimulate or destroy living
cells
Lose intensity with distance; x-rays travel in straight lines and cannot be
focused to a point
X-Ray Tube - 🧠 ANSWER ✔✔Protective leaded glass housing
Tube enclosure with all the air removed; shielding prevents radiation
leakage
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, High vacuum glass tube surrounded by refined oil with high insulating
powers; oil helps to absorb excess heat
4
Cathode - 🧠 ANSWER ✔✔Made of a tungsten filament and molybdenum
cup; NEGATIVE charge
a. filament: heated to give off a cloud of electrons; thermionic emission
b. cup: focuses electrons towards the anode
c. *supplies the electrons necessary to generate x-rays
Anode - 🧠 ANSWER ✔✔Made of a copper arm and focal spot; POSITIVE
charge
a. focal spot is made of tungsten (target = tungsten)
b. *converts bombarding electrons into x-ray photons
Inside the x-ray tube... - 🧠 ANSWER ✔✔Electron steam travels from
negative cathode to positive anode
What happens when electrons strike the tungsten target? - 🧠 ANSWER
✔✔The energy of motion is converted to x-ray energy and heat... 99% of
the energy is lost as heat
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
Exam Questions and Correct Answers |
1
New Update
Radiation History - 🧠 ANSWER ✔✔Wilhelm Roentgen discovered the x-ray
in 1895
He discovered x-rays while experimenting with a cathode ray tube
Who discovered the x-ray? - 🧠 ANSWER ✔✔Wilhelm Roentgen
How did ___ discover the x-ray? - 🧠 ANSWER ✔✔Wilhelm Roentgen;
discovered it while experimenting with a cathode ray tube
Ionization - 🧠 ANSWER ✔✔The production of ions
Ions - 🧠 ANSWER ✔✔An atom that gains or loses an electron and
becomes electrically unbalanced
Ion pair - 🧠 ANSWER ✔✔Results when an electron is removed from an
atom in the ionization process;
- atom becomes the positive ion
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,- the ejected electron becomes the negative ion
Ionizing Radiation - 🧠 ANSWER ✔✔Radiation that is capable of producing
2
ions by removing or adding an electron to an atom; x-rays produce
ionization
Particulate Radiation - 🧠 ANSWER ✔✔Tiny particles of matter that possess
mass and travel in straight lines at high speeds;
- electrons, beta particles, cathode rays, protons, alpha particles and
neutrons
Electromagnetic Radiation - 🧠 ANSWER ✔✔The propagation of wave-like
energy (without mass, without particles) through space or matter;
- cosmic rays, x-rays*, microwaves, radio waves, gamma rays, ultraviolet
rays, visible light
Velocity - 🧠 ANSWER ✔✔Speed of a wave
Wavelength - 🧠 ANSWER ✔✔Distance between the crest of one wave to
the crest of the next wave
Frequency - 🧠 ANSWER ✔✔The number of wavelengths that pass a point
in a certain amount of time
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,X-Ray - 🧠 ANSWER ✔✔Electromagnetic ionizing radiation of VERY
SHORT WAVELENGTH resulting from the bombardment of tungsten by
3
highly accelerated electrons in a vaccuum
Properties of X-Radiation - 🧠 ANSWER ✔✔Wave form; travel in waves with
short wavelengths and high frequency
Travel at a speed of light
Have the power to penetrate substances
Invisible
No mass, no weight and no charge
Absorbed by matter
Exert an effect on living tissue; x-rays are able to stimulate or destroy living
cells
Lose intensity with distance; x-rays travel in straight lines and cannot be
focused to a point
X-Ray Tube - 🧠 ANSWER ✔✔Protective leaded glass housing
Tube enclosure with all the air removed; shielding prevents radiation
leakage
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, High vacuum glass tube surrounded by refined oil with high insulating
powers; oil helps to absorb excess heat
4
Cathode - 🧠 ANSWER ✔✔Made of a tungsten filament and molybdenum
cup; NEGATIVE charge
a. filament: heated to give off a cloud of electrons; thermionic emission
b. cup: focuses electrons towards the anode
c. *supplies the electrons necessary to generate x-rays
Anode - 🧠 ANSWER ✔✔Made of a copper arm and focal spot; POSITIVE
charge
a. focal spot is made of tungsten (target = tungsten)
b. *converts bombarding electrons into x-ray photons
Inside the x-ray tube... - 🧠 ANSWER ✔✔Electron steam travels from
negative cathode to positive anode
What happens when electrons strike the tungsten target? - 🧠 ANSWER
✔✔The energy of motion is converted to x-ray energy and heat... 99% of
the energy is lost as heat
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
