Subject	isotope
Predicate	has_property
Object	useful
Modality	Modality Occurrences some[subj/radioactive] 1
Polarity	POSITIVE
Plausibility	0.9540
Neighborhood Sigma	0.9546
Local Sigma	0.9540
Example Sentences	Sentence Occurrences Source isotopes are useful 4 Google Autocomplete, Answers.com Questions radioactive isotopes are useful 1 Google Autocomplete the isotopes are useful 1 Google Autocomplete