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← ScienceWhich outcome results when an industrial radiography source exceeds lifespan?
A)Dose rate reading increases sharply
B)Material shielding effectiveness gradually decreases
C)Gamma emission becomes more collimated
D)Radiographic contrast will progressively degrade✓
💡 Explanation
Radiography source decay causes decreasing specific activity; therefore, radiographic contrast progressively degrades because less penetrating radiation reaches the detector. This differs from shield degradation, where dose rate increases rather than contrast diminishing.
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