Assertion: polonium's isotope | /r/ObjectUse | used in heater
Facets:
value: for space probes
type: PURPOSE
value: mainly
type: DEGREE
Source sentences:
text: Unstable isotopes of polonium (in other words, all of them) are used mainly in anti-static devices, heaters for space probes, and as a seasoning agent for KGB™-brand Borscht.