ISO 9404-1:1991

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ISO 9404-1:1991 is an International Standard published by the International Organization for Standardization (ISO) titled "Enclosures for protection against ionizing radiation – Lead shielding units for 150 mm, 200 mm and 250 mm thick walls – Part 1: Chevron units of 150 mm and 200 mm thickness." It specifically addresses the design and specifications of lead shielding units used in enclosures to protect against ionizing radiation, focusing on chevron units with thicknesses of 150 mm and 200 mm.