IRRSP Industrial Radiography Radiation Safety Personnel (IRRSP) Practice Test Latest Update 2025-2026 Actual Exam 50 Questions with 100% Verified Correct Answers Guaranteed A+ Verified by Professor 0.957 R/hr - CORRECT ANSWER: The radiation intensity at 1 foot from an Iridium-192 source is 598 R/hr. What is the radiation intensity at 25 feet from this source?
- 0.957 R/hr
- 0.010 R/hr
- 23.90 R/hr
- 5.980 R/hr
100 keV - CORRECT ANSWER: When operating an x-ray machine at 300 kVp, what is
the average energy of x-rays produced?
- 900 keV
- 300 keV
- 100 keV
- 1.3 meV
100 mR/hr - CORRECT ANSWER: The "High Radiation Area" boundary is established
where the exposure could exceed:
- 500 mR/hr
- 100 mR/hr
- 5 mR/hr
- 2 mR/hr
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127 feet - CORRECT ANSWER: Using a 50 Curie Iridium-192 source and a 3 HVL
collimator, what is the distance a radiographer must place the Restricted area boundary?
- 19 feet
- 127 feet
- 222 feet
- 81 feet
1480 GBq - CORRECT ANSWER: A 40 Curie Iridium-192 source is approximately equal
to:
(1 Ci = 37 Gbq)
- 1480 GBq
- 10 GBq
- 2 GBq
- 10,480 GBq
16 - CORRECT ANSWER: The use of 4 half value layers of shielding will reduce an
intensity by a factor of:
- 4
- 8
- 16
- 32
189.1 feet - CORRECT ANSWER: An Iridium-192 source that was originally 110 Curies has decayed for 222 days. At what distance from the source should a radiographer place the "Restricted Area" boundary?
- 189.1 feet
- 411.1 feet
- 119.6 feet
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