title: Gamma-ray activity in bituminous, subbituminous and lignite coals.
mesh_terms: D001729:Bismuth / Q000032:analysis; D003031:Coal / Q000032:analysis*; D005720:Gamma Rays; D011197:Potassium Radioisotopes / Q000032:analysis; D011848:Radioactive Pollutants / Q000032:analysis*; D011851:Radioactivity; D011868:Radioisotopes / Q000032:analysis; D013051:Spectrometry, Gamma; D013910:Thorium / Q000032:analysis
chemical_list: D003031:Coal; D011197:Potassium Radioisotopes; D011848:Radioactive Pollutants; D011868:Radioisotopes; D013910:Thorium; D001729:Bismuth