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A summary of methods for cyclotron production of  235 Np (396.1d),  236 Pu (2.858y) and  237 Pu (45.2d)  via  nuclear reactions with protons and  3 He-ions on  235,236,238 U and  237 Np targets in wide energy ranges is given. Methods for the chemical separation and purification of these nuclides from the irradiated uranium and neptunium targets are described. Cross sections, yields and radionuclidic purities of  235 Np,  236 Pu and  237 Pu are presented and compared with literature data on the nuclear reactions leading to these radionuclides. The nuclear reactions with the so far highest known yields of  235 Np,  236 Pu and  237 Pu are determined:  236 U( p ,2 n )  235 Np,  237 Np( p ,2 n + pnβ  - )  236 Pu and  237 Np( p , n )  237 Pu, respectively. The highest radionuclidic purity of  235 Np,  236 Pu and  237 Pu tracers can be reached with the  236 U( p ,2 n )  235 Np,  236 U( p , nβ  - )  236 Pu and  237 Np( 3 He, t )  237 Pu reactions, respectively. In addition new cross sections and yield data of the  236 U( 3 He, p 3 n )  235 Np reaction in the energy range 42.4–60 MeV are given.

Production of 235 Np, 236 Pu and 237 Pu via nuclear reactions on 235,236,238 U and 237 Np targets