The property of obstructing the passage of radiant energy is:
A) radiopaque.
B) radioactive.
C) radiolucent.
D) radionuclide.
A
Explanation: A) Correct.
B) Radioactive means emitting energy.
C) Radiolucent allows the passage of radiant energy.
D) Radionuclide is a radioactive species of an atomic nucleus.
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