What is a Thallium?
Thallium is a chemical element with the symbol Tl and atomic number 81. It is a gray post-transition metal that is not found free in nature. When isolated, thallium resembles tin, but discolors when exposed to air.
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How do people get thallium?
The significant, likely routes of exposure near hazardous waste sites are through swallowing thallium-contaminated soil or dust, drinking contaminated water, and skin contact with contaminated soil.
How much thallium kills a person?
Ten to 15 mg/kg
Internationally thallium toxicity is common in developing countries; however, little data is available. Six percent to 15% has been reported for acute thallium toxicity. Ten to 15 mg/kg is a lethal dose for humans. Death can still occur at lower dosages.