Which of the following is not an application of nuclear processes?
A. Positron emission tomography, PET, - used to map metabolic activity in the brain with Fluorine - 18.
B. Magnetic resonance imaging, MRI - used in detecting radio frequency radiation that comes from protons responding to magnetic fields.
C. Radioactive dating using potassium - 40 forming argon - 40 to determine the possible age of volcanic rock.
D. The development of the "geiger-marsden" counter which can detect the emission of various radioactive particles from a source.
E. Each of these are possible applications of nuclear processes.