title: Determination of trace fluorine in biological materials by photonuclear activation analysis.
mesh_terms: D000201:Activation Analysis; D005461:Fluorine / Q000652:urine*; D012275:Oryza / Q000737:chemistry; D010777:Photochemistry; D010945:Plants, Edible / Q000737:chemistry; D012987:Soil / Q000032:analysis; D014131:Trace Elements / Q000032:analysis*
chemical_list: D012987:Soil; D014131:Trace Elements; D005461:Fluorine