Mercury (element) and galinstan alloy thermometers are also an option. Mercury thermometers are still occasionally used in the medical field because they are more accurate than alcohol thermometers, though both are commonly being replaced by electronic thermometers and less commonly by galinstan thermometers. Mercury thermometers are still widely used for certain scientific applications because of their greater accuracy and working range. Historically, one of the largest releases was from the Colex plant, a lithium-isotope separation plant at Oak Ridge, Tennessee. The plant operated in the 1950s and 1960s. Records are incomplete and unclear, but government commissions have estimated that some two million
Toxic Substances Control Act of 1976 new chemical not listed in the 1976 act by using a PMN. Section 5 of the Toxic Substances Control Act (TSCA) does not require any toxicity testing before submitting a PMN No safety information is required to be included in the PMN, so the EPA must rely on computer modeling to determine whether the new chemical "may present an unreasonable risk." In order to regulate new chemicals, the EPA must determine that the chemical "...may present an unreasonable risk to human health or the environment..." or show that the chemical "... is or will be produced in substantial quantities, and