Check the answer against the original book
Physics: Farr 3rd → Carter & Vealé, Digital Radiography and PACS 3rd → reliable primary online sources. Other subjects: Stephanie Ryan 4th → Chapman 8th (Helmi version) → Bontrager 9th → Grainger 7th → Radiopaedia. Once an applicable source supports the statement and answer, stop; another book's silence does not invalidate it.
Printed page labels and original PDF positions are recorded separately; no global offset is assumed.
MCQ Reference books
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Question-bank reference audit
Source-checked means the passage supports the statement and T/F verdict. Pending means the hierarchy review is unfinished, not that the answer is incorrect. Specific warnings identify unresolved wording or source conflicts. Automated page matches alone do not verify an answer. Status is bound to the exact question, options, key and explanation.
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