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Which outcome occurs when a sealed americium-241 smoke detector reaches end-of-life?

A)Ionization chamber current decreases
B)Alpha particle energy increases
C)Detector voltage steadily increases
D)Beta decay converts Am into Pu

💡 Explanation

The alpha source decays; therefore, the ionization chamber current decreases because fewer ions are generated. Alpha emission diminishes, rather than beta decay causing transmutation, thus ionization cannot be sustained as activity falls with radioactive decay.

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