DIN 25425-4 Beiblatt 2:2023-01 放射性核素实验室 第4部分:人员保护规则
Radionuclide Laboratories - Part 4: Rules for the protection of persons; Supplement 2: Guidance notes on shielding of gamma- and beta-radiation / Note: Date of issue 2022-11-25*Intended as replacement for DIN 25425-4 Beiblatt 2 (2013-02).