Editing Carbon-14 (section)

===Total inventory===
The inventory of carbon-14 in Earth's biosphere is about 300 [[Curie (unit)|megacuries]] (11&nbsp;[[Exa-|E]][[Becquerel|Bq]]), of which most is in the oceans.<ref>{{cite web|title=Human Health Fact Sheet – Carbon 14 |publisher=Argonne National Laboratory, EVS |date=August 2005 |url=http://www.ead.anl.gov/pub/doc/carbon14.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110716164724/http://www.ead.anl.gov/pub/doc/carbon14.pdf |archive-date=2011-07-16 }}</ref>
The following inventory of carbon-14 has been given:<ref name="Choppin-2002">{{cite book | vauthors = Choppin GR, [[Jan-Olov Liljenzin|Liljenzin JO]], Rydberg J | date = 2002 | title = Radiochemistry and Nuclear Chemistry | edition = 3rd | publisher = Butterworth-Heinemann | isbn = 978-0-7506-7463-8}}</ref>
* Global inventory: ~8500&nbsp;PBq (about 50&nbsp;[[tonne|t]])
** Atmosphere: 140&nbsp;PBq (840&nbsp;kg)
** Terrestrial materials: the balance
* From nuclear testing (until 1990): 220&nbsp;PBq (1.3&nbsp;t)