Assertion: polonium's life | /r/HasProperty | defined
Facets:
Source sentences:
text: Radioactive decay is stochastic, but since the half-life is defined simply as the time period it takes for the probability of a radioactive atom to decay to reach 50%, that is no objection to its being measured with great precision (like this for 21Na, with six digits indeed, even if the uncertainty affects the last two).