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Absorbed doses (Gy) to spheres of different mass (0.01, 0.1, 1, and 10 g) resulting from a uniform concentration of events (1 decay per µm3) due to injection of the 67/64CuCl2 mixture obtained with 1 µA proton beam and different irradiation times (circles: 62 h; triangles: 124 h; squares: 185 h) of (a) a 68Zn target in the energy range 70–35 MeV; (b) a 70Zn target in the energy range 70–45 MeV; (c) a composite 70Zn–68Zn target in the energy range 70–55 and 55–35 MeV, respectively.
