thorium
MediLexicon thorium - Medical Dictionary Definition for Term 'thorium'
[1. A radioactive metallic element; atomic no. 90, atomic wt. 232.0381. 232Th, the only naturally occurring nuclide, with a half-life of 14 × 109 years, is used in colloidal form in electron microscopy as a stain for acid mucopolysaccharides.
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