Correct answer: (B) Characteristic-radiation production; (D) Pair production
Explanation
The official key accepts B OR D as alternatives for this single-choice item. Characteristic emission is secondary radiation following atomic ionization rather than the primary interaction itself. Pair production requires at least 1.022 MeV, outside ordinary diagnostic X-ray energies. Photoelectric absorption and Compton scattering are the relevant primary diagnostic interactions. Either officially accepted option is retained.
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