IRRSP Practice Test Solved
The activity of a radioactive source - Correct Answer 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
Reddening of the skin, loss of hair, blistering - Correct 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 - Correct 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 - Correct 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 - Correct 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 - Correct 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 - Correct 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 - Correct Answer The term that describes how gamma or x-rays are reduced in
intensity when passing through shielding material is:
The activity of a radioactive source - Correct Answer 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
Reddening of the skin, loss of hair, blistering - Correct 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 - Correct 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 - Correct 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 - Correct 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 - Correct 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 - Correct 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 - Correct Answer The term that describes how gamma or x-rays are reduced in
intensity when passing through shielding material is:
