Radiation The Essential Guide for Technologists was written specifically for Radiation Control Technicians (RCT) or Radiation Protection Technologists (RPT). The learning objectives described by the National Registry of Radiation Protection Technologists (NRRPT) were used as a basis for the content of the book. The goal of the book is to provide technical information for those who wish to become RPT s and eventually, NRRPT. The text describes and provides the student over 140 examples of common calculations, and over 240 homework problems. Instrument descriptions and selection criteria, basics of dosimetry and performance of radiation measurements of ionizing radiation are covered in detail. The textbook covers the multiple skill sets are necessary to implement the radiation control measures needed in a given situation.