NCIt definition : A unit of radioactivity equal to one billionth of a curie or 37 becquerels, and corresponding
to radioactivity of 37 atomic disintegrations per second.;
Alternative definition : CDISC: A unit of radioactivity equal to one billionth of Curie or 37 Becquerels, and
corresponding to a radioactivity of 37 atomic disintegrations per second.(NCI);