Radioactivity and radioactive substances an introduction to the study of radioactive substances and their radiations This book, "Radioactivity and radioactive substances an introduction to the study of radioactive substances and their radiations", by James Chadwick, is a replication of a book originally published before 1921. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.