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Parameter Value(mBq/g) Americium-241 (241Am) 1.1 Cobalt-60 (60Co) 320 Cesium-137 (137Cs) 59.2 Plutonium-238 (238Pu) 0.26 Plutonium-239,240 (239Pu + 240Pu) 4 Antimony-125 (125Sb) <0.14 Strontium-90 (90Sr) 1090 Thorium-228 (228Th) 28.6 Thorium-232 (232Th) 26.8 Uranium-235 (235U) 0.75 Uranium-238 (238U) 17.4