RADIOLOGY COMPREHENSIVE TEST BANK
QUESTIONS AND VERIFIED ANSWERS
REVIEW PACKAGE
●● What was the x-ray discovery year by Wilhelm Conrad Röntgen?
Answer: Produced and detected "Röntgen rays" to create a
"Röntgenogram" in 1895
●● Why did Röntgen call them "x-rays"?
Answer: He did not know what the new rays were, so he called them "x-
rays"
●● When did Wilhelm Conrad Röntgen win the Nobel Prize?
Answer: Received the Nobel Prize in Physics in 1901
●● When were the early dental radiographs taken?
Answer: Dental radiographs were being taken within 1 month of the
invention of x-rays
●● What was the early radiograph exposure time?
Answer: 25-30 minutes
,●● What was the early radiograph adverse observation?
Answer: Patients noticed hair loss on the side of the head being
irradiated
●● How are x-rays created?
Answer: X-rays are created when electrons are accelerated into a heavy
metal such as tungsten, molybdenum, or rhodium
●● Explain x-rays in terms of human perception and travel.
Answer: X-rays are invisible to human perception and travel in straight
lines around the speed of light
●● What does x-ray penetration depends on?
Answer: The degree of x-ray penetration depends on x-ray energy and
the matter the rays are traveling through
●● Why are x-rays considered ionizing radiation?
Answer: They have enough energy to ionize matter and can damage or
destroy living cells
●● What is the definition of ionizing radiation?
Answer: An electromagnetic wave strong enough to transfer enough
energy into an atom or molecule to expel an electron, causing ionization
, ●● What is the mechanism of permanent damage in ionizing radiation?
Answer: Both the expelled electron and the ionized molecule can cause
permanent damage, usually to DNA; a minimum amount of energy must
be transferred to the electron at one time for the electron to be expelled
●● Where are x-rays located on the electromagnetic spectrum?
Answer: X-rays and gamma rays are shown in the high-frequency, short-
wavelength ionizing radiation region of the electromagnetic spectrum
●● What is Röntgen (R or r)?
Answer: International unit of exposure dose for x-rays or gamma rays
●● What does RAD stand for?
Answer: Radiation absorbed dose; the amount of radiant energy
absorbed in a certain amount of tissue
●● What does REM stand for?
Answer: Roentgen-equivalent-man; a measurement unit that accounts
for different biological responses to different kinds of radiation. The
radiation quantity measured by rem is equivalent dose
●● What is a Becquerel (Bq)?
Answer: The unit for measuring the radioactivity of a substance;
formally 1 decay/second
QUESTIONS AND VERIFIED ANSWERS
REVIEW PACKAGE
●● What was the x-ray discovery year by Wilhelm Conrad Röntgen?
Answer: Produced and detected "Röntgen rays" to create a
"Röntgenogram" in 1895
●● Why did Röntgen call them "x-rays"?
Answer: He did not know what the new rays were, so he called them "x-
rays"
●● When did Wilhelm Conrad Röntgen win the Nobel Prize?
Answer: Received the Nobel Prize in Physics in 1901
●● When were the early dental radiographs taken?
Answer: Dental radiographs were being taken within 1 month of the
invention of x-rays
●● What was the early radiograph exposure time?
Answer: 25-30 minutes
,●● What was the early radiograph adverse observation?
Answer: Patients noticed hair loss on the side of the head being
irradiated
●● How are x-rays created?
Answer: X-rays are created when electrons are accelerated into a heavy
metal such as tungsten, molybdenum, or rhodium
●● Explain x-rays in terms of human perception and travel.
Answer: X-rays are invisible to human perception and travel in straight
lines around the speed of light
●● What does x-ray penetration depends on?
Answer: The degree of x-ray penetration depends on x-ray energy and
the matter the rays are traveling through
●● Why are x-rays considered ionizing radiation?
Answer: They have enough energy to ionize matter and can damage or
destroy living cells
●● What is the definition of ionizing radiation?
Answer: An electromagnetic wave strong enough to transfer enough
energy into an atom or molecule to expel an electron, causing ionization
, ●● What is the mechanism of permanent damage in ionizing radiation?
Answer: Both the expelled electron and the ionized molecule can cause
permanent damage, usually to DNA; a minimum amount of energy must
be transferred to the electron at one time for the electron to be expelled
●● Where are x-rays located on the electromagnetic spectrum?
Answer: X-rays and gamma rays are shown in the high-frequency, short-
wavelength ionizing radiation region of the electromagnetic spectrum
●● What is Röntgen (R or r)?
Answer: International unit of exposure dose for x-rays or gamma rays
●● What does RAD stand for?
Answer: Radiation absorbed dose; the amount of radiant energy
absorbed in a certain amount of tissue
●● What does REM stand for?
Answer: Roentgen-equivalent-man; a measurement unit that accounts
for different biological responses to different kinds of radiation. The
radiation quantity measured by rem is equivalent dose
●● What is a Becquerel (Bq)?
Answer: The unit for measuring the radioactivity of a substance;
formally 1 decay/second
