Answer:
Option B, Americium-241, is the right answer.
Step-by-step explanation:
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A device which senses smoke usually as an indicator of fire is known as a smoke detector.
- The two most common types of smoke detectors are the Ionization chamber and photoelectric smoke indicators.
- Many of these smoke detectors comprise some amount of americium-241, which is a radioactive substance.
- These smoke detectors respond immediately to fires that give off some smoke.
