This 1958 book sets out the elementary precautions to be taken by anyone handling radioactive isotopes in laboratories. The introductory sections explain the types of radiation encountered, and enumerate the possible dangers from external sources, accidental ingestion and contamination of the body. The safety techniques for various laboratory experiments and the proper methods of disposal of radioactive waste are described in some detail. A final section on laboratory administration is followed by a convenient summary of 'dos' and do nots' for safe working. The appendices include a classified table of isotopes and their toxicity, diagrams of protective equipment, and details of the shielding necessary for emissions of given energy. Dr Boursnell confines his discussion to the common essentials of all laboratory techniques; his book will be of value to anyone with an interest in the active materials.