IRRSP PRACTICE TEST EXAM QUESTIONS WITH
VERIFIED SOLUTIONS NEW MODIFIED TESTED
AND APPROVED 2026 NEW UPGRADE
The radiation intensity from a point source is inversely proportional to the
square of the distance from the source. This is known as:
a. Inverse Square Law
b. Linear Absorption Coefficient
c. Photoelectric Attenuation Process
d. Ohm's Law --CORRECT ANSWER--Inverse Square Law
The thickness of shielding material required to reduce a radiation intensity to
one-half it's original value is known as the:
a. Tenth value layer
b. Half life
c. Roentgen value layer
d. Half value layer --CORRECT ANSWER--Half value layer
An element is identified by the number of _______ in it's nucleus.
a. Photons
b. Neutrons
c. Electrons
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,d. Protons --CORRECT ANSWER--Protons
What basic methods should a radiographer use to control exposure to radiation?
a. Half life, shielding and distance
b. Alarm rate meters, shielding and distance
c. Shielding, film badges and distance
d. Time, distance, shielding and ALARA considerations --CORRECT
ANSWER--Time, distance, shielding and ALARA considerations
The term "Curie" defines:
a. The exposure of a radioactive source
b. The intensity of a radioactive source
c. The activity of a radioactive source
d. The output of a radioactive source --CORRECT ANSWER--The activity of a
radioactive source
Which of the following are symptoms of an acute extremity overexposure?
a. Nausea, vomiting, diarrhea
b. Fatigue, nausea, reddening of the skin
c. Diarrhea, blistering, loss of hair
d. Reddening of the skin, loss of hair, blistering --CORRECT ANSWER--
Reddening of the skin, loss of hair, blistering
2
, The reason the gamma radiation emitted from a Cobalt-60 source is more
penetrating than the gamma radiation emitted from Iridium-192 is due to the:
a. Higher output per Curie from the Co-60
b. Longer half life of the Co-60
c. Greater intensity from the Co-60
d. Higher gamma ray energy from the Co-60 --CORRECT ANSWER--Higher
gamma ray energy from the Co-60
A 0.400 inch piece of lead shielding will reduce the radiation intensity from an
Iridium-192 source by:
a. 3/4
b. 1/2
c. 1/4
d. 1/8 --CORRECT ANSWER--3/4
When shielding against high-energy gamma rays, which of the following
characteristics provide the most effective shield?
a. Thick section of material
b. Thick section of high atomic number material
c. Thick section of low atomic number material
d. Thick section of low density material --CORRECT ANSWER--Thick section
of high atomic number material
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VERIFIED SOLUTIONS NEW MODIFIED TESTED
AND APPROVED 2026 NEW UPGRADE
The radiation intensity from a point source is inversely proportional to the
square of the distance from the source. This is known as:
a. Inverse Square Law
b. Linear Absorption Coefficient
c. Photoelectric Attenuation Process
d. Ohm's Law --CORRECT ANSWER--Inverse Square Law
The thickness of shielding material required to reduce a radiation intensity to
one-half it's original value is known as the:
a. Tenth value layer
b. Half life
c. Roentgen value layer
d. Half value layer --CORRECT ANSWER--Half value layer
An element is identified by the number of _______ in it's nucleus.
a. Photons
b. Neutrons
c. Electrons
1
,d. Protons --CORRECT ANSWER--Protons
What basic methods should a radiographer use to control exposure to radiation?
a. Half life, shielding and distance
b. Alarm rate meters, shielding and distance
c. Shielding, film badges and distance
d. Time, distance, shielding and ALARA considerations --CORRECT
ANSWER--Time, distance, shielding and ALARA considerations
The term "Curie" defines:
a. The exposure of a radioactive source
b. The intensity of a radioactive source
c. The activity of a radioactive source
d. The output of a radioactive source --CORRECT ANSWER--The activity of a
radioactive source
Which of the following are symptoms of an acute extremity overexposure?
a. Nausea, vomiting, diarrhea
b. Fatigue, nausea, reddening of the skin
c. Diarrhea, blistering, loss of hair
d. Reddening of the skin, loss of hair, blistering --CORRECT ANSWER--
Reddening of the skin, loss of hair, blistering
2
, The reason the gamma radiation emitted from a Cobalt-60 source is more
penetrating than the gamma radiation emitted from Iridium-192 is due to the:
a. Higher output per Curie from the Co-60
b. Longer half life of the Co-60
c. Greater intensity from the Co-60
d. Higher gamma ray energy from the Co-60 --CORRECT ANSWER--Higher
gamma ray energy from the Co-60
A 0.400 inch piece of lead shielding will reduce the radiation intensity from an
Iridium-192 source by:
a. 3/4
b. 1/2
c. 1/4
d. 1/8 --CORRECT ANSWER--3/4
When shielding against high-energy gamma rays, which of the following
characteristics provide the most effective shield?
a. Thick section of material
b. Thick section of high atomic number material
c. Thick section of low atomic number material
d. Thick section of low density material --CORRECT ANSWER--Thick section
of high atomic number material
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