Subject	isotope
Predicate	become
Object	radioactive
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.9026
Neighborhood Sigma	0.9031
Local Sigma	0.9194
Example Sentences	Sentence Occurrences Source isotopes become radioactive 4 Google Autocomplete an isotope become radioactive 1 Google Autocomplete