Question 1
X-rays are produced when high-energy electrons strike a target inside the X-ray tube. What primarily determines the maximum energy of the resulting X-ray spectrum?
Correct Answer:
The peak accelerating voltage (kVp)
Question 2
Iridium-192 has a half-life of approximately 75 days. A new source assayed at 80 Ci will decay to roughly what activity after 150 days?
Correct Answer:
20 Ci
Question 3
Cobalt-60 emits two principal gamma rays. What are their approximate energies?
Correct Answer:
1.17 MeV and 1.33 MeV
Question 4
Selenium-75 is increasingly used in industrial radiography because it offers an intermediate option between Ir-192 and X-rays. Approximately what is its half-life?
Correct Answer:
120 days
Question 5
The linear attenuation coefficient (mu) of a material is related to its half-value layer (HVL) by which expression?
Correct Answer:
HVL = 0.693 / mu
Question 1
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About this Exam

Prepare with the ASNT NDT III RT Practice Questions - ASNT NDT Level III Radiographic Testing (RT) Exam practice quiz. This question bank includes 100 questions covering radiography, x-ray, film, exposure, and source. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ASNT NDT III RT Practice Questions - ASNT NDT Level III Radiographic Testing (RT) Exam

This practice set contains 100 questions from the matching question bank and focuses on radiography, x-ray, film, exposure, and source. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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