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
International Institute of Risk & Safety Management International Institute of Risk & Safety Management The International Institute of Risk & Safety Management (IIRSM) is a professional membership body for safety practitioners worldwide. It is a registered British Charity (number 1107666) and UK Company limited by guarantee (number 5310696). IIRSM have two main membership streams. A “health and safety practitioner stream”, for those qualified or studying to be health and safety practitioners, and a “specialist stream”, for those who are qualified to degree or NVQ level 4 (or equivalent) and above, in a profession associated with health and safety practice but who hold no health and safety practitioner