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 qualifications. In addition, companies or other organizations may be corporate members. Alongside other Health and Safety bodies, IIRSM assisted with the Occupational Safety & Health Consultants Register (OSHCR). IIRSM represents UK health and safety professionals present in over 70 countries. Corporate membership is also available. Applicants following a recognised course of study in preparation for qualifications in health, safety or risk management. Applicants in full-time education or the Armed Forces, who are considering a career in Safety Management. Applicants who are involved in accident prevention and occupational health and safety but who do not qualify for a designated grade of