This new edition of the most comprehensive text/reference available on the methods and instrumentation used in the detection of ionizing radiation, has been updated to reflect advances since the first edition came out in 1979. The book retains the general organization of the first edition - all topics of importance are covered in sufficient detail to lead the reader from basic principles to examples of modern applications. It covers modern engineering practice, provides useful design information, and contains an up-to-date and thorough review of the literature. The text is aimed specifically at students of nuclear engineering, physics or health physics instrumentation.