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  1. What's the amount of Mercury and Thallium in a typical low-temperature thermalmeter?

  2. How poisonous is Thallium when bounded with Mercury?

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The lowest eutectic in the Hg-Tl system occurs at 8.6 at.% Tl at 213K (see W. Gierlotka et al., CALPHAD 30425-430 (2006)). This is about 21K lower than the freezing point of pure Hg.

For toxicity, refer to an SDS (MSDS) or ask you local ES&H or industrial hygiene professional.

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