Report - Richtlinie Sicherheit im Unterrichtza976/strlschtz/1_RISU.pdf · Na-22 Co-60 Kr-85 Sr-90 Cs-137 Po-210 Ra-226 Th-232 U-235 U-238 Pu-238 Am-241 Frei- grenze in kBq 1.000 100 10 10

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