Thread: Mains smoke alarms - cheep every few days
View Single Post
  #16   Report Post  
Posted to uk.d-i-y
Andy Burns[_13_] Andy Burns[_13_] is offline
external usenet poster
  
Posts: 7,829
Default Mains smoke alarms - cheep every few days
Brian Gaff wrote:

The radioactive ones must decay surely?

Yes, but with a half-life of 432 years

Reply With QuoteReply With Quote