Silicon is available at extremely high purity.The Occupational Safety and Health Administration (OSHA) sets the legal limit for workplace exposure to silicon to 15 mg/m 3 total exposure and 5 mg/m 3 respiratory exposure for an 8-hour workday. Exposure to silicon may occur by inhalation, ingestion, skin contact, and eye contact. Miners, stone cutters, and people who live in sandy regions may inhale large quantities of silicon compounds and develop a lung disease called silicosis.At least twenty radioisotopes are also known, with the most stable being silicon-32, which has a half-life of 170 years. Silicon-28 is the most abundant, accounting for 92.23% of the natural element.
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