Explanatory notes
… in the form of compounds or products which are “labelled” (i.e., contain molecules with one or more radioactive atoms). … nuclides (U 233, U 235, Pu 239) if slow neutrons are used, i.e., neutrons of an average speed of approximately … take place. This can be achieved by means of moderators , i.e., products with a low atomic mass (such as water, heavy …