ACTUAL QUESTIONS AND

IRRSP Practice Test

ACTUAL QUESTIONS AND

ANSWERS GRADED A+

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The activity of a radioactive source - ANSWER>>>The term "Curie" defines:

• The exposure of a radioactive source
• The intensity of a radioactive source
• The activity of a radioactive source
• The output of a radioactive source

Reddening of the skin, loss of hair, blistering - ANSWER>>>Which of the following are symptoms of an acute extremity overexposure?

• Nausea, vomiting, diarrhea
• Fatigue, nausea, reddening of the skin
• Diarrhea, blistering, loss of hair
• 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:

• Higher output per Curie from the Co-60
• Longer half life of the Co-60
• Greater intensity from the Co-60
• 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:

• 3/4 1 / 2

• 1/2
• 1/4
• 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?

• Thick section of material
• Thick section of high atomic number material
• Thick section of low atomic number material
• 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?

• 2.31 R/hr
• 226.2 R/hr
• 113.1 R/hr
• 32.3 R/hr

C - ANSWER>>>Gamma radiation can be defined as:

(Answer with A, B, C, or D)

• Particles having the mass and charge of two protons and two neutrons emitted from

the nucleus of an unstable atom

• Very light negatively charged particles emitted from the nucleus of an unstable atom
• Very short wavelength electromagnetic radiation emitted from the nucleus of an

unstable atom

• 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:

• Penetration
• Scatter
• Reflection
• Attenuation

• 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:

• 1.25 Rem to the whole body, 18.75 Rem to the extremities
• 20 Rem to the whole body, 200 Rem to the extremities
• 5 mRem to the whole body, 50 mRem to the extremities
• 5 Rem to the whole body, 50 Rem to the extremities

3.125 Curies - ANSWER>>>A 50 Curie Cobalt-60 source has decayed 4 half lives.What is the remaining activity?

• 6.25 Curies
• 3.125 Curies
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