Why amricium is inside smoke detector?

Americium-241 is used in smoke detectors because it emits alpha particles, which can ionize air and create a small electric current. When smoke particles enter the detector, they disrupt this current, triggering the alarm. Its radioactive properties allow for a compact design, making it effective and reliable for home safety. Additionally, americium-241 has a long half-life, ensuring a consistent performance over time.