alkali ion diode

alkali ion diode

[′al·kə‚lī ′ī·ən ′dī‚ōd]
(engineering)
In testing for leaks, a device which senses the presence of halogen gases by the use of positive ions of alkali metal on the heated diode surfaces.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.