Assertion: nitrogen's isotope | /r/HasAspect | half-life of 9.97 minutes
Facets:
Source sentences:
text: nitrogen 13 a radioactive isotope of nitrogen having a half-life of 9.97 minutes and decaying by positron emission;
text: it is used as a tracer a radioactive isotope of nitrogen having a half-life of 9.97 minutes and decaying by positron emission; it is used as ain positron emission tomography