Very Pure Barium

Barium is a chemical element with symbol Ba and atomic number 56. Barium is a soft, silvery-white metal, with a slight golden shade when ultrapure. Barium is slightly radioactive, but it's so small it is not dangerous. That radioactivity is what makes it ideal for tracking.

In Riddick universe, barium is commonly used in the bullets to mark targets for long distance tracking.[1]


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