title: The preparation of carrier-free  203 Pb for medical use.
mesh_terms: D001729:Bismuth / Q000302:isolation & purification / Q000528:radiation effects; D002852:Chromatography, Ion Exchange; D006207:Half-Life; D007456:Iodine Isotopes; D007854:Lead / Q000302:isolation & purification; D011830:Radiation Effects; D011854:Radiochemistry; D011868:Radioisotopes / Q000138:chemical synthesis*; D011879:Radiotherapy Dosage; D013057:Spectrum Analysis; D013793:Thallium / Q000302:isolation & purification / Q000528:radiation effects
chemical_list: D007456:Iodine Isotopes; D011868:Radioisotopes; D007854:Lead; D013793:Thallium; D001729:Bismuth