title: National Council on Radiation Protection and Measurements (NCRP). Specification of units for natural uranium and natural thorium.
mesh_terms: D001822:Body Burden; D006801:Humans; D008452:Maximum Allowable Concentration; D011835:Radiation Protection; D013910:Thorium; D014481:United States; D014501:Uranium
chemical_list: D014501:Uranium; D013910:Thorium