The other assumption is the corollary of the first; the biosphere has the same overall concentration of radiocarbon as the atmosphere due to equilibrium.
Radiocarbon’s entry into the global carbon cycle starts in the atmosphere where it is formed by the interaction of neutrons produced by cosmic rays with nitrogen atoms.
Mixing and exchanges happen between the atmosphere and the biosphere until such time that equilibrium is established.
Radiocarbon dating rests heavily on this assumption such that other sources of carbon 14 had, at first, not been considered nor accounted for.
There are two human activities recognized to have irreparably changed the global radiocarbon levels—the burning of fossil fuel and nuclear weapons testing.
Each 25-minute episode begins with an introduction by Roald and showcases a TV adaptation of a short fantasy horror or science-fiction story.
The first episode centres on Roald's own short story .
The series, and Roald's dry commentary, both gain positive critical reviews but the run is relatively short due to uneven viewing figures.
Roald would go on to host a similar TV series in Britain in the 1980s called In November 1962, Olivia 'Twenty' Dahl, eldest daughter of Roald Dahl and Patricia Neal, died from measles encephalitis.