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Smoke Detectors
Radiation has always been the major bone of contention between the two
factions. Critics of ionization systems ask: Why take any risks when another type of detector, devoid of any inherently dangerous elements, can alert people to fires? Scientists point out that ingestion of even a minute amount of americium-241, which is a waste product from the nuclear cycle, can cause cancer.
http://www.fun-home-projects.com/home_ownership/safety_and_special_interest/smoke_detectors.html