Since the 1950s, gamma and electron beam facilities have been used for medical, industrial and research purposes, and their safety record has been very good. With the publication of this book, international, harmonized safety guidance is available for all those involved in the design, control and safe use of this type of irradiation facility. Subject areas such as the classification of irradiators, regulatory control and special procedures are covered, and the safety philosophy for all types of irradiators is explained.