Assertion: thorium's isotope | /r/AtLocation | trace amounts
Facets:
Source sentences:
text: …in nature is the isotope thorium-232 (several other isotopes exist in trace amounts or can be produced synthetically).
text: 232Th is the only primordial nuclide of thorium and makes up effectively all of natural thorium, with other isotopes of thorium appearing only in trace amounts as relatively short-lived decay products of uranium and thorium.
text: Almost all thorium found in nature is the isotope thorium-232 (several other isotopes exist in trace amounts or can be produced synthetically).