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The possibilities of production of the therapy-related radionuclides  140 Nd,  153 Sm and  169 Yb, and of  88 Y, in no-carrier-added form were investigated. For  88 Y production the nuclear processes  nat Sr( p,xn ) 88 Y and  nat Rb(α,  xn ) 88 Y over the energy ranges  E  p  = 14→9 MeV and  E  α  = 18→12 MeV, respectively, can be utilised, although the former reaction is superior, both in terms of yield and radionuclidic purity. For  140 Nd production the reactions  141 Pr( p , 2 n ) 140 Nd and  nat Ce( 3 He,  xn ) 140 Nd were investigated in detail. The optimum energy ranges are  E  p  = 30→15 MeV and  E   3 He  = 35→ 20 MeV, respectively. Both processes yield high-purity  140 Nd. The former reaction, however, leads to a product yield about 17 times higher than the latter reaction, and is therefore to be preferred. In the case of  153 Sm, investigations were done on the  153 Eu( n,p ) 153 Sm reaction with 14 MeV d(Be) neutrons as well as on the  150 Nd(α,  n ) 153 Sm reaction. The yield of the ( n,p ) reaction is very low, but the (α,  n ) reaction over the energy range  E  α  = 25→15 MeV offers a good potential for production of no-carrier-added  153 Sm in quantities sufficient for therapeutic applications. Also for the radionuclide  169 Yb a novel route,  viz.  169 Tm( p,n ) 169 Yb reaction, was investigated. A critical comparison of this route with the commonly used ( n , γ) route, however, showed that, due to the much higher cost involved, the ( p,n ) process should be utilised only when there is a real need of the high specific radioactivity product.

Nuclear data for production of 88 Y, 140 Nd, 153 Sm and 169 Yb via novel routes