10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The IRRSP exam has 100 questions and runs 3 hours.
These 10 free IRRSP questions are organized by exam domain, so you can see how each part of the Industrial Radiography Radiation Safety Personnel - X-Ray (IRRSP) blueprint is tested. Reveal the answer and explanation under each question.
An operator increases the milliamperage (mA) setting on an industrial X-ray unit while leaving the kilovoltage (kV) unchanged. What is the effect on the radiation produced?
Correct answer: C - The quantity of photons increases while the maximum photon energy is unchanged
An industrial X-ray tube and a sealed iridium-192 source both emit high-energy photons. What is the fundamental difference between X-radiation and gamma radiation?
Correct answer: A - X-rays originate outside the nucleus; gamma rays originate within the nucleus
A radiographer submits a written declaration of pregnancy to her employer. Under 10 CFR 20.1208, the dose limit to the embryo/fetus is:
Correct answer: B - 0.5 rem (5 mSv) over the entire gestation period, from the time of declaration
Which statement correctly describes a stochastic effect of radiation exposure?
Correct answer: D - The probability of the effect increases with dose, with no threshold assumed
Following a suspected acute whole-body exposure, which blood component typically shows depression first and serves as an early biological indicator of dose?
Correct answer: A - Lymphocytes, because they are the most radiosensitive cells found in the blood
A survey meter reads 640 mR/hr at 2 feet from an X-ray tube head. Assuming the inverse square law applies and no additional shielding is present, what is the approximate exposure rate at 8 feet?
Correct answer: C - 40 mR/hr
The half-value layer of lead for a particular X-ray beam is 3 mm. An unshielded dose rate of 800 mR/hr is measured at the boundary. What thickness of lead is required to reduce the dose rate to 100 mR/hr?
Correct answer: B - 9 mm
A radiographer may receive no more than 40 mrem during a particular operation. The measured dose rate at his working position is 120 mrem/hr. What is the maximum time he may remain at that position?
Correct answer: C - 20 minutes
While surveying toward a workpiece with a Geiger-Muller survey meter, a radiographer notices the meter reading falling toward zero as he moves closer. What is the most important consideration?
Correct answer: A - The detector may be saturating in a very high radiation field and reading falsely low
A radiographer must WEAR all of the following during radiographic operations EXCEPT:
Correct answer: D - A portable radiation survey instrument calibrated within the previous six months
The IRRSP exam also covers these domains. Drill them in the full free practice test:
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