There can hardly be any doubt that radiation will continue to be an im-
portant factor in our lives. Present and future advances in atomic tech-
nology urgently require further work on research and development in the
field of radiation biology if the maximum benefit is to be obtained at
minimal risk from the various kinds of radiation that form a major by-
product of nuclear processes. Consequently, it is also necessary to
prepare students and younger scientists for doing such work. The present
book originates from teaching experience gained in lectures, seminars,
and discussion groups started by the undersigned in 1957 and more
recently held together with Drs. Dertinger and Jung. The friendly
comments given to the German edition made us feel that it might be
worth- while to put the results of our efforts at the disposal of those
to whom English is more familiar. In agreement with the view, based on
well-known facts, that most if not aIl of the more striking practical
achievements have resulted from patient and careful investigations into
some basic problem, the book aims at introducing the reader to the
methods of thought and experiment used in molecular radiation biology as
weIl as to the results obtained thereby.