title: Radioactivity in books produced during the last 50 years.
mesh_terms: D001877:Books; D002588:Cesium Radioisotopes / Q000032:analysis; D005060:Europe; D007194:India; D007564:Japan; D010209:Paper / Q000032:analysis; D011197:Potassium Radioisotopes / Q000032:analysis; D011847:Radioactive Fallout; D011868:Radioisotopes / Q000032:analysis*; D011883:Radium / Q000032:analysis; D013910:Thorium / Q000032:analysis; D006113:United Kingdom; D014481:United States
chemical_list: D002588:Cesium Radioisotopes; D011197:Potassium Radioisotopes; D011847:Radioactive Fallout; D011868:Radioisotopes; D013910:Thorium; D011883:Radium