Radiocarbon Dating - The Castle Bravo Test

Carbon 14 is a radioactive isotope of carbon. It's been in the atmosphere for so long that all the radioactive isotopes of carbon have decayed, so it's just got regular carbon in it. Bomb radio carbon was spreading across the planet from test sites in the pacific and the arctic. The bomb radiocarbon didn't start plunging down into the depths of the north atlantic until the 19 eighties when john clark this character from the castle bravo test, was two decades into retirement. And he points out also that lots of ocean bears are not underwater test subjects - even though they could be used to make bombs.