"Protactinium" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus,
MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure,
which enables searching at various levels of specificity.
A radioactive element of the actinide group of metals. It has the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission.
Below are MeSH descriptors whose meaning is more general than "Protactinium".
Below are MeSH descriptors whose meaning is more specific than "Protactinium".
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