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With the aim of preparing carrier-free  28 Mg and  47 Ca simultaneously, Ti, V and Fe targets were examined by irradiating with high-energy ions of  12 C,  14 N and  16 O accelerated by the RIKEN Ring Cyclotron. Among the targets, V gave the highest cross section for the formation of both  28 Mg and  47 Ca irrespective of the kind of beams. The cross section for the formation of  28 Mg by the reactions of Ti, V and Fe targets with ion beams increased in the order of  12 C &lt;  16 O&lt; 14 N. On the other hand, the three beams exhibited almost the same cross sections for the formation of  47 Ca by the reaction of a given target. Titanium and V were selected as prospective targets and  14 N as a suitable beam for the production of  28 Mg and  47 Ca. Chemical separation procedures of the radiotracers in carrier- and salt-free states have been established by using cation exchange resins. The recovery yields of  28 Mg and  47 Ca from Ti target were 70 and 90%, respectively, and the decontamination factor was less than 10 -5 . The recovery yields of  28 Mg and  47 Ca from V target were 80% and the decontamination factor was less than 10 -7 .

Simultaneous production of 28 Mg and 47 Ca by high-energy heavy-ion irradiation for applications in biology