Hi,Originally Posted by [b
alpha-Radiation consists of very big parts which only reach few cm in air and they are already shielded by a sheet of paper. So as long as you don't dismount your smoke detector there is virtually no risk. Modern smoke detectors all work by optical means which is not harmful at all - are these ancient radioactive smoke detectors still sold in the US?
P.S.: tweek, there is a massive difference between natural radioctive radiation ond the stuff inside this keyring!