Abstract
A method is given for the preparation of appreciable quantities of practically carrier-free Ni 63 from pile irradiations of copper via the Cu 63( n,p) reaction, which has an effective cross-section of 3 millibarns for the neutron spectrum encountered in a typical LITR irradiation. The beta spectrum was studied in a large gas proportional counter with carrier-free Ni 63 mounted on a saturation thickness of platinum foil placed as a platform inside the sensitive volume. The allowed Fermi-Kurie plot appears to be linear to 7·5 keV, which suggests that the decay probably belongs to the class of allowed transitions with exceptionally long half-lives, interpreted to be “ l-forbidden.” The endpoint of the beta-spectrum occurs at 67·0 ± 0·5 keV. The irradiation of spectroscopically-pure copper oxide powder produced appreciable amounts of Co 60 and Zn 65 corresponding to 0·6 p.p.m. cobalt and 1–2 p.p.m. zinc as subspectroscopic impurities in the target material.
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