Abstract:
PREPARATIONOF14C┐UREATianYuanHanPeizhenTianShuhao(InstituteofRadiationMedicine,ChineseAcademyofMedicalSciencesandthePekingUnionMedicalColege,Tianjin300192)ABSTRACTPreparationof14C-ureafromBa14CO3isreported.Ba14CO3isheatedat820-850℃for2.5—3.0hoursinastreamofpuredryammoniatoobtainBaN14CN.14C-ureaisthenpre-paredbyhydrolysisofBaN14CNwithH2SO4.Theradioactiveyieldofthe14C-ureais84%.Thechemicalandradiochemicalpurityoftheproductare99.8%and>99.9%byHPLC.Thespecificactivityoftheproductcanbeadjustedbyaddingcarrieraccordingtorequire-ment.Keywords14C-ureapreparationureabreathtest(UBT)helicobacterpylori(HP)