Gamma-ray emitters in concrete.
D001417:Background Radiation; D003252:Construction Materials; D005160:Facility Design and Construction; D011883:Radium / Q000032:analysis*; D011886:Radon / Q000032:analysis*; D013910:Thorium / Q000032:analysis*
D013910:Thorium; D011886:Radon; D011883:Radium