Abstract: STUDY ON THE PAPER CHROMATOGRAM OF 153SmEDTMPChen Daming Jin Xiaohai Bai hongsheng Wan Fan\ Du Jin Liu Yuemin(Isotope Department, China Institute of Atomic Energy, Beijing 102413)ABSTRACTTwo kinds of new rapid paper chromatography system, which are V(ammonium solution)∶V（CH3OH）∶V（H2O）=0.1∶2∶4 (pH=11.0-14.0) and V(ammonium solution)∶V（CH3COCH3）∶V（H2O）=0.2∶0.5∶4 (pH=7.0-9.0) are used for 153SmEDTMP radiochemical purity determination. Compared with the old system(V(C5H5N)∶V（C2H5OH）∶V（H2O）=1∶2∶4），the new ones reduce sharply the developing time and get an efficient separation of 153SmEDTMP from 153SmCl3, it is especially the system V (ammonium solution)∶V(CH 3COCH 3)∶ V (H 2O)=0.2∶0.5∶4 (pH=7.0-9.0) that reduces the developing time about 1-2 h.Key words 153SmEDTMP paper chromatography developing system