On Sat, 17 Jan 2015 22:26:28 -0500, Stormin Mormon
wrote:

On 1/17/2015 6:36 PM, Frank wrote:

I'd say if they work they should be OK.
It's carbon monoxide detectors that have expiration dates.

Ionization smoke detetors use a radioactive
isotope that has a half life. They are good
for about ten years.

I was recently injected iwth something whose half-life for gamma
emission is 6.0058 hours. I'm not good for much. .