Carbon-14 is continually formed in nature by the interaction of neutrons with nitrogen-14 in the Earths atmosphere; the neutrons required for this reaction are produced by cosmic rays interacting with the atmosphere.

Is c14 artificial?

The huge thermal neutron flux produced by nuclear bombs reacted with nitrogen atoms present in the atmosphere to form carbon 14. The carbon 14 produced is what is known as bomb carbon or artificial radiocarbon.

Is carbon-14 a diamond?

The battery is a betavoltaic cell using carbon-14 (14C) in the form of diamond-like carbon (DLC) as the beta radiation source, and additional normal-carbon DLC to make the necessary semiconductor junction and encapsulate the carbon-14.