This new edition of a bestseller offers the same easy to follow writing style and format that were hallmarks of the previous editions with updated and augmented information throughout. The authors cover new applications of radiation equipment such as homeland security instrumentation in nuclear power plants. The appendices include a list of websites for companies dealing in radiation measurement equipment development. The text has been designed explicitly to address the current worldwide resurgence in nuclear education. Since many of these programs are not in traditional nuclear engineering departments, this text emphasizes basic fundamental concepts with a wide array of modern applications.