Makoto Hosono , MD, PhD, is a Professor of Radiology and Nuclear Medicine, Institute of Advanced Clinical Medicine, Kindai University Faculty of Medicine, Japan, and serves as a member of Committee 3, International Commission on Radiological Protection. Jean-François Chatal , MD, PhD, is an Emeritus Professor of Nuclear Medicine at the University of Nantes, France. He is one of the international leaders who developed radioimmunotherapy, that is, therapy using radiolabeled anti-tumor antibodies. He created and headed an INSERM research laboratory and also initiated the installation of a cyclotron institute termed ARRONAX for the production of novel radionuclides for nuclear medicine.