Calculation of the Spin and Energy Dependence of the Fission Width for U-235 and Pu-239

Direct preparation of Na₂ ³⁵SO₄ from neutron irradiated KC1 has been studied. Irradiated KCl was dissolved in water and passed through a H⁺-form cation exchanger column to remove K⁺ ions. The effluent, after the addition of Na₂SO₄ carrier, was neutralized with NaOH. From this solution was separated solid Na₂ ³⁵SO₄ by the addition of ethanol, leaving NaCl in the solution.

Certain factors such as ethanol concentration and pH of the system, from which labeled sulfate was precipitated, as well as the amount of carrier, were found to affect greatly the recovery of the labeled sulfate. Conditions that bring about sufficiently high recovery were determined, and an effective means was established to prevent contamination with ³²P, a byproduct formed by neutron irradiation of CI.

Similar procedures have been examined to prepare labeled potassium sulfate.