An Improved Procedure for Extraction of Th with PMBP

The extraction medium was changed into HNO 3 solution based on the procedure of the extraction of thorium by PMBP from uranium irradiated with 14 MeV neutrons and thorium was extracted two times with PMBP. I - carrier and NaNO 2 solutions were added into back-extraction solution of 4 mol/L HNO 3 and Br - carrier was added into the solutions used for Fe(OH) 3 precipitation. Using the improved procedure thorium was separated from the nature uranium bombarded with 60 MeV/u 18O ions. It can be seen from the γ spectrum of the thorium fraction that the most of the production elements can be removed and especially bromine and iodine can be removed completely through the improved procedure.