Assertion: alpha decay | /r/AtLocation | uranium
Facets:
value: usually
type: TEMPORAL
value: very
type: DEGREE
Source sentences:
text: Alpha decay occurs in very heavy elements like uranium, thorium, and radium.
text: Alpha decay occurs in the nuclei of heavy elements, like radium, uranium, thorium etc.
text: Alpha decay usually occurs in heavy nuclei such as uranium or plutonium, and therefore is a major part of the radioactive fallout from a nuclear explosion.