[en] This book serves as an introductory textbook for those persons who are concerned with neutrons as a tool in their own branch of science and technology. The chapters indexed individually for the INIS database are: Neutrons in paleo sciences; Role of neutrons in nuclear science research in Hungary; Use of neutrons in solid state physics research; Neutron applications in biology and medicine; Applications of neutrons for laboratory and industrial activation analysis problems; Neutrons and the research of natural resources; Applications of neutrons in the agriculture. (R.P.)