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
Gyeongju nuclear waste disposal facility and inspections required to enforce the policies set in place by the M.O.S.T., as well as setting standards for safety, is the KINS: Korea Institute of Nuclear Safety. The Nuclear Safety Commission (NSC), a branch within the KINS, has the task of being the decision making body on nuclear safety and regulatory policies, as well as licensing. Gyeongju nuclear waste disposal facility The Gyeongju nuclear waste disposal facility is of silo-type design involving disposal at depth meant to safely house dangerous radioactive waste at Gyeongju in South Korea. Storage of Low to Intermediate Level Waste (LILW) was planned. In its