![]() ![]() This is the maximum protection for workers in danger of exposure to unknown chemical hazards or levels above the IDLH or greater than the AEGL-2. LEVEL A: (RED ZONE): Select when the greatest level of skin, respiratory, and eye protection is required.NOTE: Safe use of protective clothing and equipment requires specific skills developed through training and experience. Level A protection should be used until monitoring results confirm the contaminant and the concentration of the contaminant. GENERAL INFORMATION: First Responders should use a NIOSH-certified Chemical, Biological, Radiological, Nuclear (CBRN) Self Contained Breathing Apparatus (SCBA) with a Level A protective suit when entering an area with an unknown contaminant or when entering an area where the concentration of the contaminant is unknown.Ingestion is an important route of exposure. ROUTES OF EXPOSURE: Thallium can be absorbed into the body by inhalation, ingestion, and skin contact.Agricultural: If thallium is released into the air as fine particles (aerosol), it has the potential to contaminate agricultural products.Outdoor Air: Thallium can be released into outdoor air as fine particles (aerosol). ![]() Food: Thallium can be used to contaminate food.Water: Thallium cannot be used to contaminate water because it does not dissolve in water.Indoor Air: Thallium can be released into indoor air as fine particles (aerosol).Thallium was used historically as a rodenticide, but has since been banned in the United States due to its toxicity from accidental exposure. It also has use in some chemical reactions and medical procedures. Thallium has not been produced in the United States since 1984, but is imported for use in the manufacture of electronics, low temperature thermometers, optical lenses, and imitation precious jewels. It is found in trace amounts in the earth’s crust. Thallium is tasteless and odorless and has been used by murderers as a difficult to detect poison. DESCRIPTION: Thallium was discovered by Sir William Crookes in 1861.APPEARANCE: Bluish-white metal that turns gray on exposure to air.
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