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Heavy ion activation of natural Sb 2 O 3  with 78 MeV  16 O 6+  results in the formation of carrier-free praseodymium isotopes,  133,135 Pr, and their corresponding decay products  133,135 Ce, in the matrix. Also irradiation with ~ 90 MeV  19 F 7+  beam leads to the production of carrier-free neodymium isotopes,  135-138 Nd, which decay out to  135-138 Ce via  135-138 Pr. Another way for the production of carrier-free  135 Ce radionuclide is to irradiate CsNO 3  target with  7 Li 3+  beam of energy 44 MeV. The shorter lived radionuclides of cerium decay out and a radiochemical procedure has been developed for the separation of carrier-free radionuclides from the bulk target matrix antimony and caesium through liquid-liquid extraction (LLX) using Aliquat 336 (tricaprylmethylammonium chloride), and di-(2-ethylhexyl)phosphoric acid (HDEHP) as extractants.

Separation of carrier-free cerium radionuclides from different target matrix produced by heavy ion beams