This booklet offers detailed and specific instructions for the handling of both sealed and unsealed sources of ionizing radiation. The importance of organizing, planning, monitoring, and record-keeping is stressed in the introduction. Valuable technical hints are given as to shielding, design of work places, protective clothing, ventilation, storage, transportation, and waste disposal. Two special sections deal with accidents and decontamination. Appendix I gives the accepted figures for permissible doses of radiation with definitions of the terms and units essential in applying the data. Appendix II gives maximum permissible levels for surface contamination of equipment, work places, clothing, and skin. The book dispenses with illustrations, but readers will appreciate the succinctness of the text.