ISO 20553:2025 pdf download,Radiation protection — Monitoring of workers occupationally exposed to a risk of internal contamination with radioactive material.
ISO 20553:2025 specifies the minimum requirements for designing programmes to monitor workers who face a risk of internal contamination by radioactive material. It sets principles for defining compatible monitoring goals and requirements, and it describes how to structure different types/categories of monitoring programmes. The standard includes quantitative criteria for running the programmes, guidance on selecting suitable monitoring methods, and what background information must be collected to design the programme effectively. It also covers general requirements such as detection limits and tolerated uncertainties, and it gives how to determine measurement frequencies using ICRP Occupational Intakes of Radionuclides (OIR) concepts. It addresses particular individual-monitoring cases (for example, intakes involving actinides, wounds, or intact skin), and it requires quality assurance, plus clear documentation, reporting, and record-keeping.