Assertion: thorium | /r/HasProperty | stored
Facets:
Source sentences:
text: Thorium disintegrates to produce radon gas, an alpha emitter and radiation hazard, so areas where thorium is stored or handled require good ventilation.
text: Because one of the disintegration products of thorium is the radioactive noble gas radon ( 220 Rn), good ventilation of areas and places where thorium is stored or handled is necessary.
text: Good ventilation of areas where thorium is stored or handled is therefore essential.
text: Good ventilation of areas where thorium is stored or handled is therefore essential.