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The positron emitter  51 Mn (t 1/2  = 46.2 min, I β +   = 97%) is of potential interest in positron emission tomography (PET). With a view to optimizing its production route, excitation functions for deuteron induced nuclear reactions on isotopically enriched (~95%)  50 Cr were determined radiochemically over the energy range of 3 to 13 MeV and for proton induced nuclear reactions on  nat Cr in the range of 18 to 38 MeV. Cross sections are presented for the reactions:  50 Cr(d,2n)  50m Mn,  50 Cr(d,n)  51 Mn,  50 Cr(d,t) 49 Cr,  50 Cr(d,p) 51 Cr,  50 Cr(d,a) 48 V,  52 Cr(d,2p) 52 V,  nat Cr(p,x)  51 Mn,  nat Cr(p,x) 52 Mn,  nat Cr(p,x) 52m Mn,  nat Cr(p,x) 54 Mn,  nat Cr(p,x) 48 Cr,  nat Cr(p,x) 49 Cr,  nat Cr(p,x)  51 Cr,  nat Cr(p,x) 48 V and  nat Cr(p,x) 45 Ti. In the case of proton induced reactions on  nat Cr, the isomeric cross section ratio for the isomeric pair  52m,g Mn was also determined. The results are interpreted in terms of the spins of the two isomers concerned. Theoretical thick target yields were derived from the corresponding excitation functions. The maximum achievable thick target yield of  51 Mn is 1.1 GBq/μAh in the case of the  50 Cr(d,n)  51 Mn reaction at E d  = 14 → 3 MeV, and 3.2 GBq/μAh in the case of the  nat Cr(p,x) 51 Mn process for E p  = 40 → 20 MeV. The  50 Cr(d,n)  51 Mn process is the favourable production route for  51 Mn, since the radioisotopic purity is high and a small-sized medical cyclotron is adequate to produce this positron emitter in sufficient quantities.

Investigation of 50 Cr(d,n) 51 Mn and nat Cr(p,x) 51 Mn processes with respect to the production of the positron emitter 51 Mn