“It is unstable, and scientists know that it radioactively decays by electron emission to Nitrogen 14, with a half life of 5730 years.”

“Exposing the gel to photographic film would give me a pattern of dark bands like a bar code, showing the positions of the radioactively labelled fragments.”

“Another proprietary antibody that binds to CD20, called tositumomab, is radioactively labelled.”