Assertion: gamma ray's source | /r/HasProperty | radioactive minerals
Facets:
value: in phosphate fertilizers
type: LOCATION
value: in crushed rock
type: LOCATION
value: in building materials
type: LOCATION
Source sentences:
text: Less significant artificial sources of radiation include radioactive minerals in crushed rock, building materials, and phosphate fertilizers; radiation-emitting components of television sets, smoke detectors, and various other consumer products; radioactive fallout from nuclear weapons (Table 8); and radiation released in nuclear power production (Table 6).