This part of ISO 7503 applies to the evaluation of tritium contamination on surfaces of equipment and facilities, containers of radioactive materials and sealed sources. It does not apply to the evaluation of tritium contamination of the skin and of clothing. NOTE— Evaluation of surface contamination from beta-emitters (maximum beta energy greater than 0,15 MeV) and alpha-emitters is dealt with in ISO 7503-1. Other radionuclides of practical importance (for example electron capture and isomeric transition emitters) will be dealt with in a future International Standard.