RESCUE ME
'(<a href="http://www.j-archive.com/media/2009-05-12_DJ_22.jpg" target="_blank">You may not know this.  I know I didn't know it before <i>Rescue Me</i>, but...</a>)  The radioactive element americium-241 knocks off electrons from oxygen & nitrogen in this type of smoke detector named for the process'
ionization