Research of Radioisotope Production with Fast Neutrons, (V):Trial Preparation of Carrier-Free <SUP>65</SUP>Ni
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The preparation of carrier-free 65Ni was studied using the reaction <SUP>65</SUP>Cu(n, p) <SUP>65</SUP>Ni in a nuclear reactor. High purity copper metal was irradiated for 20 min in the JRR-2 reactor. Nickel-65 formed in the copper target was separated by anion exchange method. About 1 μc <SUP>65</SUP>Ni per gram of copper was obtained by irradiation with a fast neutron flux of 9×10<SUP>11</SUP> n/cm<SUP>2</SUP>/sec and thermal neutron flux of 3.6×10<SUP>13</SUP> n/cm<SUP>2</SUP>/sec. The specific activity was greater than 3 mc/mg Ni which was over 600 times more than that produced by (n, γ) reaction on nickel irradiated at the same time. However, the reaction yield of <SUP>65</SUP>Ni per gram of target by the (n, p) reaction was only 1/5, 000 of that by the (n, γ) reaction, so that it proved that the method would be unsuitable for practical application.<BR> The cross section for the reaction <SUP>65</SUP>Cu(n, p) <SUP>65</SUP>Ni has been estimated semi-theoretically to be 0.6mb, an experimental value of 0.2mb was calculated from the results of the present work.
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