The time, estimated from measurement of the isotopic composition, during which the content of a radioactive species within an object has remained unchanged except for nuclear decay.
Source:
PAC, 1982, 54, 1533
(Glossary of terms used in nuclear analytical chemistry (Provisional))
on page 1549
Transformed and rewritten from PDF version (entry
http://www.iupac.org/goldbook/R05078.pdf)
by: Miloslav Nic, Jiri Jirat, Bedrich Kosata, ICT Prague, Czech Republic
