title: On the yearly course of radon and thoron inductions and the long lasting radioactivity of aerosols in Plovdiv.
mesh_terms: D002031:Bulgaria; D011851:Radioactivity; D011886:Radon; D012621:Seasons; D013910:Thorium; D014887:Weather
chemical_list: D013910:Thorium; D011886:Radon