IRRSP Practice Test Latest Update 2025 Complete Exam
Actual Exam Questions with Correct Verified Answers/ Graded A+
1. The term "Curie" defines: The activity of a ra-
a. The exposure of a radioactive source dioactive source
b. The intensity of a radioactive source
c. The activity of a radioactive source
d. The output of a radioactive source
2. Which of the following are symptoms of an acute Reddening of the
extremity overexposure? skin, loss of hair,
a. Nausea, vomiting, diarrhea blistering
b. Fatigue, nausea, reddening of the skin
c. Diarrhea, blistering, loss of hair
d. Reddening of the skin, loss of hair, blistering
3. The reason the gamma radiation emitted from a Higher gamma ray
Cobalt-60 source is more penetrating than the gamma energy from the
radiation emitted from Iridium-192 is due to the: Co-60
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
4. A 0.400 inch piece of lead shielding will reduce the 3/4
radiation intensity from an Iridium-192 source by:
a. 3/4
b. 1/2
c. 1/4
d. 1/8
5. When shielding against high-energy gamma rays, Thick section of
which of the following characteristics provide the high atomic num-
most effective shield? ber material
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
6. The radiation intensity at 1 foot from an Iridium-192 2.31 R/hr
source is 452.4 R/hr. What is the radiation intensity at
14 feet?
, IRRSP Practice Test 2025
a. 2.31 R/hr
b. 226.2 R/hr
c. 113.1 R/hr
d. 32.3 R/hr
7. Gamma radiation can be defined as: C
(Answer with A, B, C, or D)
a. Particles having the mass and charge of two pro-
tons 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.
8. The term that describes how gamma or x-rays are Attenuation
reduced in intensity when passing through shielding
material is:
a. Penetration
b. Scatter
c. Reflection
d. Attenuation
9. The annual radiation exposure limits for a radiograph- 5 Rem to the
er or an assistant can be summarized by: whole body, 50
a. 1.25 Rem to the whole body, 18.75 Rem to the ex- Rem to the ex-
tremities tremities
b. 20 Rem to the whole body, 200 Rem to the extremi-
ties
c. 5 mRem to the whole body, 50 mRem to the extrem-
ities
d. 5 Rem to the whole body, 50 Rem to the extremities
10. A 50 Curie Cobalt-60 source has decayed 4 half lives. 3.125 Curies
What is the remaining activity?
a. 6.25 Curies
b. 3.125 Curies
Actual Exam Questions with Correct Verified Answers/ Graded A+
1. The term "Curie" defines: The activity of a ra-
a. The exposure of a radioactive source dioactive source
b. The intensity of a radioactive source
c. The activity of a radioactive source
d. The output of a radioactive source
2. Which of the following are symptoms of an acute Reddening of the
extremity overexposure? skin, loss of hair,
a. Nausea, vomiting, diarrhea blistering
b. Fatigue, nausea, reddening of the skin
c. Diarrhea, blistering, loss of hair
d. Reddening of the skin, loss of hair, blistering
3. The reason the gamma radiation emitted from a Higher gamma ray
Cobalt-60 source is more penetrating than the gamma energy from the
radiation emitted from Iridium-192 is due to the: Co-60
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
4. A 0.400 inch piece of lead shielding will reduce the 3/4
radiation intensity from an Iridium-192 source by:
a. 3/4
b. 1/2
c. 1/4
d. 1/8
5. When shielding against high-energy gamma rays, Thick section of
which of the following characteristics provide the high atomic num-
most effective shield? ber material
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
6. The radiation intensity at 1 foot from an Iridium-192 2.31 R/hr
source is 452.4 R/hr. What is the radiation intensity at
14 feet?
, IRRSP Practice Test 2025
a. 2.31 R/hr
b. 226.2 R/hr
c. 113.1 R/hr
d. 32.3 R/hr
7. Gamma radiation can be defined as: C
(Answer with A, B, C, or D)
a. Particles having the mass and charge of two pro-
tons 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.
8. The term that describes how gamma or x-rays are Attenuation
reduced in intensity when passing through shielding
material is:
a. Penetration
b. Scatter
c. Reflection
d. Attenuation
9. The annual radiation exposure limits for a radiograph- 5 Rem to the
er or an assistant can be summarized by: whole body, 50
a. 1.25 Rem to the whole body, 18.75 Rem to the ex- Rem to the ex-
tremities tremities
b. 20 Rem to the whole body, 200 Rem to the extremi-
ties
c. 5 mRem to the whole body, 50 mRem to the extrem-
ities
d. 5 Rem to the whole body, 50 Rem to the extremities
10. A 50 Curie Cobalt-60 source has decayed 4 half lives. 3.125 Curies
What is the remaining activity?
a. 6.25 Curies
b. 3.125 Curies
