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& Exposure (7th Edition) | Latest Update
2025/2026 | Verified Radiography Resource
Part I: Radiation History & Fundamentals (Ch. 1)
1. When were X-rays discovered, and by whom?
a. October 8, 1985 by Marie Curie
b. November 8, 1895 by Wilhelm Conrad Roentgen
c. January 23, 1896 by Thomas Edison
d. August 15, 1902 by William Crookes
Correct Answer: b – Wilhelm Conrad Roentgen discovered X-rays on November 8, 1895, while
experimenting with a Crookes tube.
2. The term "X-ray" was originally used to signify:
a. The penetrating power of the ray.
b. The mathematical symbol for the unknown.
c. The electrical charge of the ray.
d. The name of the tube used.
Correct Answer: b – "X" was used to denote the unknown nature of the radiation at the time of
discovery.
3. Which of the following describes "fluorescence"?
a. The continuous emission of light after energy exposure.
b. The instantaneous production of light only during interaction with energy.
c. The bending of light through a lens.
d. The reddening of the skin.
Correct Answer: b – Fluorescence is the immediate emission of light from a material (like barium
platinocyanide) when stimulated by radiation.
4. What is "Erythema"?
a. A cancerous tumor caused by radiation.
b. The genetic mutation of DNA.
c. Reddening of the skin caused by exposure to large doses of radiation.
, d. The fluorescent glow of a tube.
Correct Answer: c – Erythema was an early sign of biologic damage, characterized by reddening
and burning of the skin.
5. X-rays are a form of electromagnetic radiation. They possess:
a. Only electrical properties.
b. Only magnetic properties.
c. Both electrical and magnetic properties.
d. Neither electrical nor magnetic properties.
Correct Answer: c – As electromagnetic radiation, X-rays have dual electrical and magnetic
properties that travel as waves.
Part II: The X-ray Beam & Production (Ch. 2 & 3)
6. The cathode side of the x-ray tube is responsible for:
a. Producing the x-ray beam.
b. Producing a thermionic cloud of electrons.
c. Converting electron energy into x-ray photons.
d. Filtering the low-energy photons.
Correct Answer: b – The cathode contains the filament (usually tungsten) which, when heated,
undergoes thermionic emission to produce electrons.
7. The anode, specifically the focal spot, is where:
a. The thermionic cloud is created.
b. The electrons are boiled off.
c. X-rays are produced via bremsstrahlung interactions.
d. The beam is collimated.
Correct Answer: c – The anode serves as the target. High-speed electrons interact with the
anode material (tungsten) to produce x-ray photons.
8. The majority (99%) of the kinetic energy of electrons striking the anode is converted into:
a. X-ray photons.
b. Visible light.
c. Heat.
d. Secondary radiation.
Correct Answer: c – The x-ray tube is highly inefficient; less than 1% of energy is converted to x-
rays, while 99% is dissipated as heat.
9. Which type of interaction produces the majority of useful x-rays in the diagnostic range?
a. Characteristic interaction
b. Photoelectric absorption
& Exposure (7th Edition) | Latest Update
2025/2026 | Verified Radiography Resource
Part I: Radiation History & Fundamentals (Ch. 1)
1. When were X-rays discovered, and by whom?
a. October 8, 1985 by Marie Curie
b. November 8, 1895 by Wilhelm Conrad Roentgen
c. January 23, 1896 by Thomas Edison
d. August 15, 1902 by William Crookes
Correct Answer: b – Wilhelm Conrad Roentgen discovered X-rays on November 8, 1895, while
experimenting with a Crookes tube.
2. The term "X-ray" was originally used to signify:
a. The penetrating power of the ray.
b. The mathematical symbol for the unknown.
c. The electrical charge of the ray.
d. The name of the tube used.
Correct Answer: b – "X" was used to denote the unknown nature of the radiation at the time of
discovery.
3. Which of the following describes "fluorescence"?
a. The continuous emission of light after energy exposure.
b. The instantaneous production of light only during interaction with energy.
c. The bending of light through a lens.
d. The reddening of the skin.
Correct Answer: b – Fluorescence is the immediate emission of light from a material (like barium
platinocyanide) when stimulated by radiation.
4. What is "Erythema"?
a. A cancerous tumor caused by radiation.
b. The genetic mutation of DNA.
c. Reddening of the skin caused by exposure to large doses of radiation.
, d. The fluorescent glow of a tube.
Correct Answer: c – Erythema was an early sign of biologic damage, characterized by reddening
and burning of the skin.
5. X-rays are a form of electromagnetic radiation. They possess:
a. Only electrical properties.
b. Only magnetic properties.
c. Both electrical and magnetic properties.
d. Neither electrical nor magnetic properties.
Correct Answer: c – As electromagnetic radiation, X-rays have dual electrical and magnetic
properties that travel as waves.
Part II: The X-ray Beam & Production (Ch. 2 & 3)
6. The cathode side of the x-ray tube is responsible for:
a. Producing the x-ray beam.
b. Producing a thermionic cloud of electrons.
c. Converting electron energy into x-ray photons.
d. Filtering the low-energy photons.
Correct Answer: b – The cathode contains the filament (usually tungsten) which, when heated,
undergoes thermionic emission to produce electrons.
7. The anode, specifically the focal spot, is where:
a. The thermionic cloud is created.
b. The electrons are boiled off.
c. X-rays are produced via bremsstrahlung interactions.
d. The beam is collimated.
Correct Answer: c – The anode serves as the target. High-speed electrons interact with the
anode material (tungsten) to produce x-ray photons.
8. The majority (99%) of the kinetic energy of electrons striking the anode is converted into:
a. X-ray photons.
b. Visible light.
c. Heat.
d. Secondary radiation.
Correct Answer: c – The x-ray tube is highly inefficient; less than 1% of energy is converted to x-
rays, while 99% is dissipated as heat.
9. Which type of interaction produces the majority of useful x-rays in the diagnostic range?
a. Characteristic interaction
b. Photoelectric absorption
