The standard specifies requirements for the use and performance of safety marking systems in plants and equipments where ionizing radiation appears. To warn against radiation exposition, sing-boards, stop chains and sign stripes are defined. They comply with the radiation protection ordinance and with the X-ray ordinance of the federal republic of germany.The standard is not valid for safety marking systems complying with the regulations for the safe transport of radioactive materials on public roads and with requirements complying with 37 radiation protection ordinance of the fed. rep of germany.