Home > Products > Fire Detection DevicesLegacy Detection Discovery Ionisation Smoke Detector The Discovery Ionisation Smoke Detector uses a low activity radioactive foil to irradiate the air in the smoke chamber. View Product XP95 I.S. Ionisation Detector The XP95 Intrinsically Safe Ionisation (I.S.) Smoke Detector uses a low activity radioactive foil to detect fires. View Product XP95 Ionisation Smoke Detector The XP95 Addressable Ionisation Smoke Detector uses a low activity radioactive foil to detect fires. View Product