Assertion: astatine | /r/AtLocation | uranium and thorium minerals
Facets:
value: in extremely low concentra-tions
type: LOCATION
Source sentences:
text: Astatine can be found in uranium and thorium minerals as part of the natural decay series, however, the total amount present at any point in time in the entire earth's crust is estimated to be less than 30 grams.
text: Astatine can be found in uranium and thorium minerals but in extremely low concentra-tions; the source of astatine is nuclear reactions between bismuth and alpha particles with high energy.
text: Astatine can be found in uranium and thorium minerals but in extremely low concentra-tions; the source of astatine is nuclear reactions between bismuth and alpha particles with high energy.