IRRSP Practice Test 2026 – Updated Study Guide, Exam Prep & Certification Review

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IRRSP Practice Test 2026(NEW UPDATED VERSION) LATEST ACTUAL EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED QUESTIONS AND ANSWERS)-
GUARANTEED PASS A+ UPDATED




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



QUESTION : 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



QUESTION : 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



QUESTION : 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


practice exam 2026

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b. 1/2

c. 1/4

d. 1/8



QUESTION : 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



QUESTION : 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



QUESTION : 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.



QUESTION : Attenuation - CORRECT ANSWER The term that describes how gamma or x-rays
are reduced in intensity when passing through shielding material is:

a. Penetration



practice exam 2026