Assertion: astatine | /r/AtLocation | nature
Facets:
value: naturally
type: MANNER
value: by berta karlik
type: OTHER
value: by traude bernert
type: OTHER
Source sentences:
text: Astatine is actually found in nature although it only appears as a minor spur on an obscure pathway in uranium fission.
text: Three years later, astatine was found in nature by Berta Karlik and Traude Bernert as an intermediate in radioactive decay chains.
text: It wasn't until three years later, however, that astatine was found in nature.
text: Astatine can be found in small amounts naturally in nature, but the majority of the Astatine used is produced synthetically in laboratories.
text: Three years later, it was found in nature; however, with an estimated amount of less than 28 grams (1 oz) at given time, astatine is the least abundant element in Earth's crust among non-transuranium elements.