Darkoshi

The Americium-241 in ionization-type smoke detectors has a half life of 432.2 years. I note that the US National Fire Protection Association requires that smoke detectors be replaced ten years after the manufacture date, no reason is given. In California, smoke detectors with replaceable batteries are banned. I find this highly suspect. The only beneficiary of throwing out fully functional household appliances is the manufacturer and the businesses selling them.