Health monitoring for thallium


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This guide helps doctors monitor the health of workers exposed to thallium.  

Thallium (CAS 7440-28-0) is a blue-white, very soft metal. It oxidises in air to form a layer of thallous oxide (Tl2O). It forms alloys with other metals and readily mixes with mercury. 

Examples of work involving thallium and its compounds include: 

  • analysing rocks, ores and sand, and separating diamonds in the laboratory 

  • making pigments, paints, artificial gems, coloured glass, and optical glasses for lenses and prisms, electronic devices and switches 

  • cleaning fossil fuel furnaces or flues and metal machining in smelters, power plants and cement factories 

  • making special alloy anode plates to use in magnesium sea water batteries 

  • making fireworks (green colour). 

This guide is part of a health monitoring guide collection. 

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Managing health and safety
Health monitoring