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
Defence Explosive Ordnance Disposal, Munitions and Search Training Regiment Defence Explosive Ordnance Disposal, Munitions and Search Training Regiment The Defence Explosive Ordnance Disposal, Munitions and Search Training Regiment (DEMS Training Regiment) is an element of the Royal School of Military Engineering responsible for the delivery of training to British Army Ammunition Technicians, Ammunition Technical Officers and Search Operators. The Regiment delivers training from two locations: Marlborough Barracks, MoD Kineton near Kineton, Warwickshire and St George's Barracks, MoD Bicester, near Bicester, Oxfordshire. In 2009 the Defence Explosive Ordnance Disposal, Munitions and Search School (DEMSS) was formed, bringing together the School of Ammunition, the Defence Explosive Ordnance Disposal School and the