Period 6 element devices though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor of alcohol-filled, galinstan-filled, digital, or thermistor-based instruments. It remains in use in scientific research applications and in amalgam material for dental restoration. It is used in lighting: electricity passed through mercury vapor in a phosphor tube produces short-wave ultraviolet light which then causes the phosphor to fluoresce, making visible light. Thallium is a chemical element with the symbol Tl and atomic number 81. This soft gray other metal resembles tin but discolors when exposed to air. The
Bomb disposal conventional munitions on operations, as well as battle area clearance and High Risk Search in support of improvised explosive device disposal. Royal Engineers providing search advice and assets and Ammunition Technicians and Ammunition Technical Officers of 11 EOD Regiment RLC Royal Logistic Corps providing Improvised Explosive Device Disposal (IEDD), Conventional Munitions Disposal (CMD) and Biological, Chemical Munitions Disposal (BCMD). They also provide expertise in Advanced IEDD and in the investigation of accidents and incidents involving ammunition and explosives, where they are seen as Subject Matter Experts (SMEs). Weapons Intelligence is supplied by Royal Military Police, Intelligence Corps and Ammunition Technical