Respuestas al mensaje #8

Most smoke detectors use Americium-241 radiation to detect for smoke. After a while, the radioactive element has decayed away.

The ones that run on small radioactive samples do lose effectiveness after a long while, because of the half-life of the sample inside.

Those are disposables. They last the requisite 10 years iirc. I've seen ones from the 90s that still beep when you put smoke in them, but it...