vertical levels, providing an accurate 3D "picture" of reactivity and allowing fine tuning to consume the nuclear fuel most economically. In automobile manufacturing, rhodium is also used in the construction of headlight reflectors. Precautions Being a noble metal, pure rhodium is inert and harmless in elemental form. However, chemical complexes of rhodium can be reactive. For rhodium chloride, the median lethal dose (LD50) for rats is 198 mg () per kilogram of body weight. Like the other noble metals, rhodium has not been found to serve any biological function. People can be exposed to rhodium in the workplace by inhalation. The Occupational Safety and Health Administration (OSHA) has specified the legal limit (Permissible exposure limit) for rhodium exposure in the workplace at 0.1 mg/m3 over an 8-hour workday, and the National Institute for Occupational Safety and Health (NIOSH) has set the recommended exposure limit (REL), at the same level. At levels of 100 mg/m3, rhodium is immediately dangerous to life or health. For soluble compounds, the PEL and REL are both 0.001 mg/m3. See also 2000s commodities boom 2020s commodities boom Bullion Bullion coin Rhodium compounds References External links Rhodium at The Periodic Table of Videos (University of Nottingham) Rhodium Technical and Safety Data CDC – NIOSH Pocket Guide to Chemical Hazards Chemical elements Noble metals Transition metals Native element minerals Chemical elements with face-centered cubic structure