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In nuclear medicine, which outcome occurs when excessive metastable isotope accumulates in a technetium-99m generator?

A)Reduced overall daughter isotope production
B)Increased rate of parent isotope decay
C)Elevated elution efficiency of pertechnetate
D)Enhanced gamma ray shielding effectiveness

💡 Explanation

Reduced daughter isotope production occurs because the **equilibrium shift** is hampered; higher metastable isotope concentrations feed back to slow the rate of decay and thereby reducing daughter product. Therefore, production decreases, rather than efficiency improving because the generator is saturated.

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