IRRSP PRACTICE TEST GRADED A+ TO PASS
CERTIFICATION EVALUATION 2026
SOLVED QUESTIONS AND SOLUTIONS
GRADED A+
⩥ Reddening of the skin, loss of hair, blistering. Answer: 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
⩥ Higher gamma ray energy from the Co-60. Answer: 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
⩥ 3/4. Answer: 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
⩥ Thick section of high atomic number material. Answer: 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
⩥ 2.31 R/hr. Answer: The radiation intensity at 1 foot from an Iridium-
192 source is 452.4 R/hr. What is the radiation intensity at 14 feet?
a. 2.31 R/hr
b. 226.2 R/hr
c. 113.1 R/hr
d. 32.3 R/hr
⩥ C. Answer: Gamma radiation can be defined as:
(Answer with A, B, C, or D)
, a. Particles having the mass and charge of two protons and two neutrons
emitted from the nucleus of an unstable atom
b. Very light negatively charged particles emitted from the nucleus of an
unstable atom
c. Very short wavelength electromagnetic radiation emitted from the
nucleus of an unstable atom
d. Particles emitted from an unstable atom with an energy in the range of
1 to 10 M.E.V.
⩥ Attenuation. Answer: The term that describes how gamma or x-rays
are reduced in intensity when passing through shielding material is:
a. Penetration
b. Scatter
c. Reflection
d. Attenuation
⩥ 5 Rem to the whole body, 50 Rem to the extremities. Answer: The
annual radiation exposure limits for a radiographer or an assistant can be
summarized by:
a. 1.25 Rem to the whole body, 18.75 Rem to the extremities
b. 20 Rem to the whole body, 200 Rem to the extremities
c. 5 mRem to the whole body, 50 mRem to the extremities
d. 5 Rem to the whole body, 50 Rem to the extremities
CERTIFICATION EVALUATION 2026
SOLVED QUESTIONS AND SOLUTIONS
GRADED A+
⩥ Reddening of the skin, loss of hair, blistering. Answer: 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
⩥ Higher gamma ray energy from the Co-60. Answer: 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
⩥ 3/4. Answer: 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
⩥ Thick section of high atomic number material. Answer: 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
⩥ 2.31 R/hr. Answer: The radiation intensity at 1 foot from an Iridium-
192 source is 452.4 R/hr. What is the radiation intensity at 14 feet?
a. 2.31 R/hr
b. 226.2 R/hr
c. 113.1 R/hr
d. 32.3 R/hr
⩥ C. Answer: Gamma radiation can be defined as:
(Answer with A, B, C, or D)
, a. Particles having the mass and charge of two protons and two neutrons
emitted from the nucleus of an unstable atom
b. Very light negatively charged particles emitted from the nucleus of an
unstable atom
c. Very short wavelength electromagnetic radiation emitted from the
nucleus of an unstable atom
d. Particles emitted from an unstable atom with an energy in the range of
1 to 10 M.E.V.
⩥ Attenuation. Answer: The term that describes how gamma or x-rays
are reduced in intensity when passing through shielding material is:
a. Penetration
b. Scatter
c. Reflection
d. Attenuation
⩥ 5 Rem to the whole body, 50 Rem to the extremities. Answer: The
annual radiation exposure limits for a radiographer or an assistant can be
summarized by:
a. 1.25 Rem to the whole body, 18.75 Rem to the extremities
b. 20 Rem to the whole body, 200 Rem to the extremities
c. 5 mRem to the whole body, 50 mRem to the extremities
d. 5 Rem to the whole body, 50 Rem to the extremities
